Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging , offshore wind farms, offshore oil exploration and drilling and related activities. Surveys may also be conducted to determine the route of subsea cables such as telecommunications cables, cables associated with wind farms, and HVDC power cables. Strong emphasis is placed on soundings, shorelines, tides, currents, seabed and submerged obstructions that relate to the previously mentioned activities. The term hydrography is used synonymously to describe maritime cartography , which in the final stages of the hydrographic process uses the raw data collected through hydrographic survey into information usable by the end user .
104-641: CCGS Hudson was an offshore oceanographic and hydrographic survey vessel operated by the Canadian Coast Guard . The ship entered service in 1963 with the Canadian Oceanographic Service, stationed at the Bedford Institute of Oceanography , called CSS Hudson . The ship made several significant scientific voyages, among them the first circumnavigation of the Americas in 1970. The ship
208-600: A beam of 15.4 metres (50 ft 6 in) and a draught of 6.8 metres (22 ft 4 in) The ship has a tonnage of 3,444 gross tonnage (GT), 1,150 tons deadweight (DWT) and a 1,033 net tonnage (NT). Hudson is certified as Arctic class 2 . The ship is powered by a diesel electric DC/DC system composed of four Alco 251B diesel engines for propulsion and two Caterpillar 398 generators for AC electrical distribution. The propulsion system, rated at 6,469 kilowatts (8,675 hp ), drives two fixed pitch propellers and bow thrusters , giving
312-702: A complement of 31, comprising 11 officers and 20 crew, with 23 additional berths available. Hudson was constructed and funded by the Canadian Department of Energy, Mines and Resources on behalf of the Canadian Oceanographic Service . The ship was built by Saint John Shipbuilding at their shipyard in Saint John, New Brunswick with the yard number 1046. The vessel was launched on 28 March 1963 and completed in December later that year. Named for
416-480: A computer-aided design (CAD) package, usually Autocad . Although the accuracy of crowd-sourced surveying can rarely reach the standards of traditional methods, the algorithms used rely on a high data density to produce final results that are more accurate than single measurements. A comparison of crowd-sourced surveys with multibeam surveys indicates an accuracy of crowd-sourced surveys of around plus or minus 0.1 to 0.2 meter (about 4 to 8 inches). NOAA maintains
520-620: A $ 4 million CAD refit beginning on 19 December 2016. The refit was performed by Heddle Marine at their shipyard in Hamilton, Ontario . Hudson was towed out of Heddle Marine's shipyard to the Canada Centre for Inland Waters in Burlington, Ontario , a Government of Canada facility. The vessel's refit, scheduled to be finished in May 2017 was unfinished at the time of the ship's removal. Hudson returned to
624-630: A helicopter for the first time. During the early 1970s, Hudson performed surveys of the Bay of Fundy and Gulf of Maine . In March 1976, Hudson rescued the entire crew of the fishery patrol vessel Cape Freels , which had been abandoned on the Grand Banks of Newfoundland after catching fire. In the late 1970s, Hudson carried out the first survey of Baffin Bay . In the 1980s and 1990s, Hudson took part in large surveys that were part of international programs such as
728-515: A lesser extent silica , peat and barite , is also a significant sector. Since 1991, offshore oil and gas has become an important part of the economy, although production and revenue are now declining. However, agriculture remains an important sector in the province, particularly in the Annapolis Valley . Nova Scotia's defence and aerospace sector generates approximately $ 500 million in revenues and contributes about $ 1.5 billion to
832-644: A massive database of survey results, charts, and data on the NOAA site . Nova Scotia Recognized Regional Languages: Nova Scotia is a province of Canada , located on its east coast. It is one of the three Maritime provinces and most populous province in Atlantic Canada , with an estimated population of over 1 million as of 2024; it is also the second-most densely populated province in Canada, and second-smallest province by area. The province comprises
936-532: A population of 969,383. Of the 958,990 singular responses to the census question concerning mother tongue , the most commonly reported languages were: Figures shown are for the number of single-language responses and the percentage of total single-language responses. Nova Scotia is home to the largest Scottish Gaelic -speaking community outside of Scotland, with a small number of native speakers in Pictou County , Antigonish County , and Cape Breton Island , and
1040-460: A rapidly developing Information & Communication Technology (ICT) sector which consists of over 500 companies, and employs roughly 15,000 people. In 2006, the manufacturing sector brought in over $ 2.6 billion in chained GDP, the largest output of any industrial sector in Nova Scotia. Michelin remains by far the largest single employer in this sector, operating three production plants in
1144-647: A series of six wars took place between the English and the French , with Nova Scotia being a consistent theatre of conflict between the two powers. Hostilities between England and France in North America resumed from 1702 to 1713, known as Queen Anne's War . The siege of Port Royal took place in 1710, ending French rule in peninsular Acadia. The subsequent signing of the Treaty of Utrecht in 1713 formally recognized British rule in
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#17329022395021248-404: A single vertical grazing angle. The first MBES generation was dedicated to mapping the seafloor in deep water. Those pioneering MBES made little, or no, explicit use of the amplitudes, as their objective was to obtain accurate measurements of the bathymetry (representing both the peaks and deeps). Furthermore, their technical characteristics did not make it easy to observe spatial variations in
1352-482: A thorough survey as a practical matter could include only a limited number of sounding measurements relative to the area being surveyed, inevitably leaving gaps in coverage between soundings. In 1904, wire-drag surveys were introduced into hydrography, and the United States Coast and Geodetic Survey ′s Nicholas H. Heck played a prominent role in developing and perfecting the technique between 1906 and 1916. In
1456-403: A vessel to be gathered in a series of lines spaced at a specified distance. However, it shared the weakness of earlier methods by lacking depth information for areas in between the strips of sea bottom the vessel sounded. A multibeam echosounder (MBES) is a type of sonar that is used to map the seabed . It emits acoustic waves in a fan shape beneath its transceiver . The time it takes for
1560-700: Is Scottish (30.0%), followed by English (28.9%), Irish (21.6%), French (16.5%), German (10.7%), First Nations (5.4%), Dutch (3.5%), Métis (2.9%), and Acadian (2.6%). 42.6% of respondents identified their ethnicity as " Canadian ". As of the 2021 Canadian Census , the ten most spoken languages in the province included English (951,945 or 99.59%), French (99,300 or 10.39%), Arabic (11,745 or 1.23%), Hindi (10,115 or 1.06%), Spanish (8,675 or 0.91%), Mandarin (8,525 or 0.89%), Punjabi (6,730 or 0.7%), German (6,665 or 0.7%), Miꞌkmaq (5,650 or 0.59%), and Tagalog (5,595 or 0.59%). The question on knowledge of languages allows for multiple responses. The 2021 Canadian census showed
1664-404: Is collected under rules which vary depending on the acceptance authority. Traditionally conducted by ships with a sounding line or echo sounding , surveys are increasingly conducted with the aid of aircraft and sophisticated electronic sensor systems in shallow waters. Offshore survey is a specific discipline of hydrographic survey primarily concerned with the description of the condition of
1768-578: Is conducted by the International Hydrographic Organization (IHO). The IHO publishes Standards and Specifications followed by its Member States as well as Memoranda of Understanding and Co-operative Agreements with hydrographic survey interests. The product of such hydrography is most often seen on nautical charts published by the national agencies and required by the International Maritime Organization (IMO),
1872-570: Is directly translated as "New Scotland" (French: Nouvelle-Écosse . Canadian Gaelic: Alba Nuadh ). In general, Latin and Slavic languages use a direct translation of "New Scotland", while most other languages use direct transliterations of the Latin/English name. The province was first named in the 1621 Royal Charter granting to Sir William Alexander the right to settle lands as a Scottish colony, including modern Nova Scotia, Cape Breton Island , Prince Edward Island , New Brunswick and
1976-438: Is more than 67 km (42 mi) from the ocean. Cape Breton Island , a large island to the northeast of the Nova Scotia mainland, is also part of the province, as is Sable Island , a small island notorious for being the site of offshore shipwrecks, approximately 175 km (110 mi) from the province's southern coast. Nova Scotia has many ancient fossil-bearing rock formations. These formations are particularly rich on
2080-539: Is outfitted with a 138 m (1,490 sq ft) flight deck and a 28 m (300 sq ft) hangar and is capable of operating one light helicopter of either the MBB Bo 105 or Bell 206L types. Hudson is equipped with one RHIB and has four laboratories. There is one 40 m (430 sq ft) geo-chem lab, two 20 m (220 sq ft) labs, one hydrographic and one oceanographic and one 18 m (190 sq ft) general purpose lab. The ship has
2184-435: Is to be logged and rendered as a survey deliverable." in a set of contract survey requirements, is a clear indication that the wider hydrographic community is embracing the benefits that can be accrued by employing MBES technology and, in particular, are accepting as a fact that a MBES which provides acoustic backscatter data is a valuable tool of the trade. The introduction of multispectral multibeam echosounders continues
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#17329022395022288-803: The American Civil War (1861–1865), primarily on behalf of the North . The British Empire (including Nova Scotia) declared itself neutral in the conflict. As a result, Britain (and Nova Scotia) continued to trade with both the South and the North. Nova Scotia's economy boomed during the Civil War. Soon after the American Civil War, Pro-Canadian Confederation premier Charles Tupper led Nova Scotia into Canadian Confederation on 1 July 1867, along with New Brunswick and
2392-503: The Bank of Nova Scotia , Cunard Line , Alexander Keith's Brewery, Morse's Tea Company (first tea company in Canada), among others. Nova Scotia became a world leader in both building and owning wooden sailing ships in the second half of the 19th century. Nova Scotia produced internationally recognized shipbuilders Donald McKay and William Dawson Lawrence . The fame Nova Scotia achieved from sailors
2496-686: The Battle of Fort Cumberland (1776) and at the Siege of Saint John (1777) . Throughout the war, American privateers devastated the maritime economy by capturing ships and looting almost every community outside of Halifax. These American raids alienated many sympathetic or neutral Nova Scotians into supporting the British. By the end of the war, Nova Scotia had outfitted numerous privateers to attack American shipping. British military forces based at Halifax succeeded in preventing an American occupation of Nova Scotia, though
2600-466: The Bay of Fundy 's shores. Blue Beach near Hantsport , Joggins Fossil Cliffs , on the Bay of Fundy 's shores, has yielded an abundance of Carboniferous -age fossils. Wasson's Bluff, near the town of Parrsboro , has yielded both Triassic - and Jurassic -age fossils. The highest point is White Hill at 533 m (1,749 ft) above sea level, situated amongst the Cape Breton Highlands in
2704-644: The Gaspé Peninsula . Nova Scotia is Canada's second-smallest province in area, after Prince Edward Island . It is surrounded by four major bodies of water: the Gulf of Saint Lawrence to the north, the Bay of Fundy to the west, the Gulf of Maine to the southwest, and the Atlantic Ocean to the east. The province's mainland is the Nova Scotia peninsula and includes numerous bays and estuaries. Nowhere in Nova Scotia
2808-492: The Gaspé Peninsula . The Mi'kmaq people are part of the large Algonquian-language family and inhabited Nova Scotia at the time the first European colonists arrived. Research published in 1871 as well as S. T. Rand's work from 1894 showed that some Mi’kmaq believed they had emigrated from the west, and then lived alongside the Kwēdĕchk, the original inhabitants. The two tribes engaged in a war that lasted "many years", and involved
2912-541: The Halifax Explosion . In April 2004, the Nova Scotia legislature adopted a resolution explicitly inviting the government of the Turks and Caicos Islands to explore the possibility of joining Canada as part of that Province . In April 2020, a killing spree occurred across the province and became the deadliest rampage in Canada's history. According to the 2016 Canadian census the largest ethnic group in Nova Scotia
3016-802: The Naval battle off Cape Breton (1781). After the Americans and their French allies won at the siege of Yorktown in 1781, approximately 33,000 Loyalists (the King's Loyal Americans, allowed to place " United Empire Loyalist " after their names) settled in Nova Scotia (14,000 of them in what became New Brunswick) on lands granted by the Crown as some compensation for their losses. (The British administration divided Nova Scotia and hived off Cape Breton and New Brunswick in 1784). The Loyalist exodus created new communities across Nova Scotia, including Shelburne , which briefly became one of
3120-504: The Nova Scotia peninsula and Cape Breton Island , as well as 3,800 other coastal islands. The province is connected to the rest of Canada by the Isthmus of Chignecto , on which the province's land border with New Brunswick is located. Nova Scotia's capital and largest municipality is Halifax , which is home to over 45% of the province's population as of the 2021 census . Halifax is the twelfth-largest census metropolitan area in Canada,
3224-652: The Province of Canada . The Anti-Confederation Party was led by Joseph Howe . Almost three months later, in the election of 18 September 1867, the Anti-Confederation Party won 18 out of 19 federal seats, and 36 out of 38 seats in the provincial legislature. Throughout the 19th century, numerous businesses developed in Nova Scotia became of pan-Canadian and international importance: the Starr Manufacturing Company (first ice skate manufacturer in Canada),
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3328-479: The Royal Navy failed to establish naval supremacy in the region. While the British captured many American privateers in battles such as the Naval battle off Halifax (1782), many more continued attacks on shipping and settlements until the final months of the war. The Royal Navy struggled to maintain British supply lines, defending British convoys from American and French attacks as in the fiercely fought convoy battle,
3432-581: The United States Navy to have the technology. In 1969, Hudson circumnavigated North America. From November 1969 to October 1970, the vessel circumnavigated North and South America, starting in Nova Scotia , travelling south to Antarctic waters, around the southern tip of South America, north through the mid-Pacific and back to Nova Scotia through the Northwest Passage . Hudson was the first vessel to circumnavigate both continents. While transiting,
3536-477: The Wayback Machine and ARGUS. Here, volunteer vessels record position, depth, and time data using their standard navigation instruments, and then the data is post-processed to account for speed of sound, tidal, and other corrections. With this approach there is no need for a specific survey vessel, or for professionally qualified surveyors to be on board, as the expertise is in the data processing that occurs once
3640-585: The "slaughter of men, women, and children, and torture of captives", and the eventual displacement of the Kwēdĕchk by the victorious Mi’kmaq. The first Europeans to settle the area were the French, who sailed into the Annapolis Basin in 1604, but chose to settle at Saint Croix Island in Maine instead. They abandoned the Maine settlement the following year and, in 1605, established a settlement at Port Royal , which grew into modern-day Annapolis Royal . This would be
3744-433: The 1950s, 1960s and 1970s eventually made the wire-drag system obsolete. Sidescan sonar could create images of underwater obstructions with the same fidelity as aerial photography , while multibeam systems could generate depth data for 100 percent of the bottom in a surveyed area. These technologies allowed a single vessel to do what wire-drag surveying required two vessels to do, and wire-drag surveys finally came to an end in
3848-520: The 2011 census, the largest denominations by number of adherents were Christians with 78.2%. About 21.18% were non-religious and 1% were Muslims . Jews , Hindus , and Sikhs constitute around 0.20%. In 1871, the largest religious denominations were Presbyterian with 103,500 (27%); Roman Catholic with 102,000 (26%); Baptist with 73,295 (19%); Anglican with 55,124 (14%); Methodist with 40,748 (10%), Lutheran with 4,958 (1.3%); and Congregationalist with 2,538 (0.65%). Nova Scotia's per capita GDP in 2016
3952-883: The 20th century. So valuable was wire-drag surveying in the United States that for decades the U.S. Coast and Geodetic Survey, and later the National Oceanic and Atmospheric Administration, fielded a pair of sister ships of identical design specifically to work together on such surveys. USC&GS Marindin and USC&GS Ogden conducted wire-drag surveys together from 1919 to 1942, USC&GS Hilgard (ASV 82) and USC&GS Wainwright (ASV 83) took over from 1942 to 1967, and USC&GS Rude (ASV 90) (later NOAAS Rude (S 590) ) and USC&GS Heck (ASV 91) (later NOAAS Heck (S 591) ) worked together on wire-drag operations from 1967. The rise of new electronic technologies – sidescan sonar and multibeam swath systems – in
4056-587: The Atlantic coast experience warmer summers more typical of inland areas, and winter lows are a little colder. On 12 August 2020, the community of Grand Étang, famous for its Les Suêtes winds, recorded a balmy overnight low of 23.3 °C (73.9 °F) The province includes regions of the Mi'kmaq nation of Mi'kma'ki ( mi'gama'gi ), the territory of which extends across the Maritimes, parts of Maine , Newfoundland and
4160-556: The British deported the Acadians and recruited New England Planters to resettle the colony. The 75-year period of war ended with the Halifax Treaties between the British and the Mi'kmaq (1761). After the war, some Acadians were allowed to return. In 1763, most of Acadia (Cape Breton Island, St. John's Island (now Prince Edward Island), and New Brunswick) became part of Nova Scotia. In 1765,
4264-639: The East Coast on 14 November 2017 to ensure that the ship was out of the Saint Lawrence Seaway before it closed. The ship underwent further refit at Halifax, which included modification to the cabins and laboratories. The ship is scheduled to return to service in April 2018. On 12 February 2019, St. John's Dockyard Ltd. of St. John's, Newfoundland and Labrador was awarded the contract to extend Hudson ' s service life by another five to ten years. Hudson began
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4368-438: The French and Acadians lived in Nova Scotia, nine significant military clashes took place as the English, Dutch, French and Mi'kmaq fought for possession of the area. These encounters happened at Port Royal, Saint John , Cap de Sable (present-day Pubnico to Port La Tour, Nova Scotia ), Jemseg (1674 and 1758) and Baleine (1629). The Acadian Civil War took place from 1640 to 1645. Beginning with King William's War in 1688,
4472-664: The Government of Canada announced several new shipbuilding projects for the Canadian Coast Guard, including a replacement for Hudson , expected to be in service by 2012. The ship rescued the seven-man crew of the fishing vessel Ocean Commander which burned and sank on 6 July 2009. The construction of the replacement for Hudson was delayed, forcing the Canadian Coast Guard to replace rusting plates aboard Hudson in 2012. The repairs were completed in September 2015. Hudson underwent
4576-650: The Joint Global Ocean Fluxes Study and World Ocean Circulation Experiment. In 1980, Hudson circumnavigated North America. Hudson contributed significantly during recovery operations during the aftermath of the semi-submersible mobile offshore drilling unit Ocean Ranger that sank in Eastern Canadian waters on 15 February 1982. Hudson saved all 24 crew members of MV Skipper 1 in the North Atlantic on 29 April 1987. On 28 April 1988, an explosion
4680-537: The National Ocean Survey (NOS) established a NOS study team to conduct investigations to determine the functional specifications for a replacement shallow water depth sounder. The outcome of the study was a class of vertical-beam depth sounders, which is still widely used. It simultaneously pinged at two acoustic frequencies, separated by more than 2 octaves, making depth and echo-amplitude measurements that were concurrent, both spatially and temporally, albeit at
4784-509: The Safety of Life at Sea (SOLAS) and national regulations to be carried on vessels for safety purposes. Increasingly those charts are provided and used in electronic form unders IHO standards. Governmental entities below the national level conduct or contract for hydrographic surveys for waters within their jurisdictions with both internal and contract assets. Such surveys commonly are conducted by national organizations or under their supervision or
4888-467: The acoustic backscatter angular response function to discriminate between different sediment types. Multispectral multibeam echosounders reinforces the fact that spatially and temporally coincident backscatter, from any given seabed, at widely separated acoustic frequencies provides separate and unique images of the seascape. Crowdsourcing also is entering hydrographic surveying, with projects such as OpenSeaMap , TeamSurv Archived 29 December 2020 at
4992-646: The aid of improved collection techniques and computer processing, the data is collected under one standard and extracted for specific use. After data is collected, it has to undergo post-processing. A massive amount of data is collected during the typical hydrographic survey, often several soundings per square foot . Depending on the final use intended for the data (for example, navigation charts , Digital Terrain Model , volume calculation for dredging , topography , or bathymetry ) this data must be thinned out. It must also be corrected for errors (i.e., bad soundings,) and for
5096-623: The capture of Port Royal in 1710, Francis Nicholson announced it would be renamed Annapolis Royal in honour of Queen Anne . As a result of Father Rale's War (1722–1725), the Mi'kmaq signed a series of treaties with the British in 1725. The Mi'kmaq signed a treaty of submission to the British crown. However, conflict between the Acadians, Mi'kmaq, French and the British persisted in the following decades with King George's War (1744–1748). Father Le Loutre's War (1749–1755) began when Edward Cornwallis arrived to establish Halifax with 13 transports on 21 June 1749. A General Court, made up of
5200-460: The continental climate are moderated by the ocean. However, winters are cold enough to be classified as continental—still being nearer the freezing point than inland areas to the west. The Nova Scotian climate is in many ways similar to the central Baltic Sea coast in Northern Europe, only wetter and snowier. This is true although Nova Scotia is some fifteen parallels further south. Areas not on
5304-452: The continual echo returns from a receive beam that is perfectly aligned with the insonification beam using time-after-transmit, a technique that is independent of water depth and the cross-track beam opening angle of the sonar receive transducer. The initial attempt at multibeam imagery employed multiple receive beams, which only partially overlapped the MBES fan-shaped insonification beam, to segment
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#17329022395025408-481: The continual echo returns into intervals that were dependent on water depth and receiver cross-track beam opening angle. Consequently, the segmented intervals were non-uniform in both their length of time and time-after-transmit. The backscatter from each ping in each of the beam-parsed segments was reduced to a single value and assigned to the same geographical coordinates as those assigned to that beam's measured sounding. In subsequent modifications to MBES bottom imaging,
5512-465: The county of Sunbury was created. This included the territory of present-day New Brunswick and eastern Maine as far as the Penobscot River . In 1769, St. John's Island became a separate colony. The American Revolution (1775–1783) had a significant impact on shaping Nova Scotia, with the colony initially displaying ambivalence over whether the colony should join the revolution; Rebellion flared at
5616-459: The cross-track variation in echo amplitudes, to achieve high quality images of the seabed, it seemed a natural progression that the fan-shaped across-track pattern of insonification associated with the new monotone higher frequency shallow water MBES, might also be exploited for seabed imagery. Images acquired under the initial attempts at MBES bottom imaging were less than stellar, but fortunately improvements were forthcoming. Side scan sonar parses
5720-1113: The data is uploaded to the server after the voyage. Apart from obvious cost savings, this also gives a continuous survey of an area, but the drawbacks are time in recruiting observers and getting a high enough density and quality of data. Although sometimes accurate to 0.1 – 0.2m, this approach cannot substitute for a rigorous systematic survey, where this is required. Nevertheless, the results are often adequate for many requirements where high resolution, high accuracy surveys are not required, are unaffordable or simply have not been done yet. In suitable shallow-water areas lidar (light detection and ranging) may be used. Equipment can be installed on inflatable craft, such as Zodiacs , small craft, autonomous underwater vehicles (AUVs), unmanned underwater vehicles (UUVs), Remote Operated Vehicles (ROV) or large ships, and can include sidescan, single-beam and multibeam equipment. At one time different data collection methods and standards were used in collecting hydrographic data for maritime safety and for scientific or engineering bathymetric charts, but increasingly, with
5824-1002: The dredging, marine construction, oil exploration , and drilling industries. Industrial entities installing submarine communications cables or power require detailed surveys of cable routes prior to installation and increasingly use acoustic imagery equipment previously found only in military applications when conducting their surveys. Specialized companies exist that have both the equipment and expertise to contract with both commercial and governmental entities to perform such surveys . Companies, universities, and investment groups will often fund hydrographic surveys of public waterways prior to developing areas adjacent those waterways. Survey firms are also contracted to survey in support of design and engineering firms that are under contract for large public projects. Private surveys are also conducted before dredging operations and after these operations are completed. Companies with large private slips, docks, or other waterfront installations have their facilities and
5928-528: The early 1990s. Vessels were freed from working together on wire-drag surveys, and in the U.S. National Oceanic and Atmospheric Administration (NOAA), for example, Rude and Heck operated independently in their later years. Single-beam echosounders and fathometers began to enter service in the 1930s which used sonar to measure the depth beneath a vessel. This greatly increased the speed of acquiring sounding data over that possible with lead lines and sounding poles by allowing information on depths beneath
6032-464: The early acoustic sounders were primarily based on the ability of magneostrictive and piezoelectric materials whose physical dimensions could be modified by means of electrical current or voltage. Eventually it became apparent, that while the operating frequency of the early single vertical beam acoustic sounders had little, or no, bearing on the measured depths when the bottom was hard (composed primarily of sand, pebbles, cobbles, boulders, or rock), there
6136-455: The echo amplitudes. Subsequent to the early MBES bathymetric surveys and at the time when single frequency side scan sonar had begun to produce high quality images of the seabed that were capable of providing a degree of discrimination between different types of sediments, the potential of the echo amplitudes from a MBES was recognized. With Marty Klein's introduction of dual frequency (nominally 100 kHz and 500 kHz) side scan sonar, it
6240-408: The echo sequence in each of the beam-parsed intervals was designated as a snippet. On each ping, each snippet from each beam was additionally parsed according to time-after-transmit. Each of the echo amplitude measurements made within a snippet from a particular beam was assigned a geographical position based on linear interpolation between positions assigned to the soundings measured, on that ping, in
6344-431: The effects of tides , heave , water level salinity and thermoclines (water temperature differences) as the velocity of sound varies with temperature and salinity and affects accuracy. Usually the surveyor has additional data collection equipment on site to measure and record the data required for correcting the soundings. The final output of charts can be created with a combination of specialty charting software or
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#17329022395026448-567: The efforts of Joseph Howe . Nova Scotia had established representative government in 1758, an achievement later commemorated by the erection of Dingle Tower in 1908. Nova Scotians fought in the Crimean War of 1853–1856. The 1860 Welsford-Parker Monument in Halifax is the second-oldest war monument in Canada and the only Crimean War monument in North America. It commemorates the 1854–55 Siege of Sevastopol . Thousands of Nova Scotians fought in
6552-574: The explorer Henry Hudson the ship entered service as CSS Hudson , in February 1964. The ship is based at Dartmouth, Nova Scotia at the Bedford Institute of Oceanography . During the 1960s, Hudson performed five surveys of the Mid-Atlantic Ridge as part of the world-wide study of continental drift . The ship took part in Expo '67 and had satellite navigation installed, becoming the first ship outside
6656-505: The far north of the province. Nova Scotia is located along the 45th parallel north , so it is midway between the Equator and the North Pole . The province contains 5,400 lakes. Nova Scotia lies in the mid-temperate zone and, although the province is almost surrounded by water, the climate is closer to continental climate rather than maritime . The winter and summer temperature extremes of
6760-506: The first British colony to achieve responsible government . In July 1867, Nova Scotia joined in Confederation with New Brunswick and the Province of Canada (now Ontario and Quebec ), forming the Dominion of Canada. "Nova Scotia" is Latin for "New Scotland " and is the recognized Canadian English name for the province. In both Canadian French and Canadian Gaelic , the province
6864-399: The first permanent European settlement in what would later become Canada. The settlement was in the Mi'kmaw district of Kespukwitk and was the founding settlement of what would become Acadia . For the next 150 years, Mi'kmaq and Acadians would form the majority of the population of the region. Warfare was a common in Nova Scotia during the 17th and 18th centuries. During the first 80 years
6968-682: The governor and the council, was the highest court in the colony at the time. Jonathan Belcher was sworn in as chief justice of the Nova Scotia Supreme Court on 21 October 1754. The first legislative assembly in Halifax, under the Governorship of Charles Lawrence , met on 2 October 1758. During the French and Indian War of 1754–1763 (the North American theatre of the Seven Years' War ),
7072-400: The language is taught in a number of secondary schools throughout the province. In 2018 the government launched a new Gaelic vehicle licence plate to raise awareness of the language and help fund Gaelic language and culture initiatives. They estimated that there were 2,000 Gaelic speakers in the province. According to the 2021 census , religious groups in Nova Scotia included: According to
7176-472: The larger British settlements in North America, and infused Nova Scotia with additional capital and skills. The migration caused political tensions between Loyalist leaders and the leaders of the existing New England Planters settlement. The Loyalist influx also pushed Nova Scotia's 2000 Mi'kmaq People to the margins as Loyalist land grants encroached on ill-defined native lands. As part of the Loyalist migration, about 3,000 Black Loyalists arrived; they founded
7280-461: The largest free Black settlement in North America at Birchtown , near Shelburne. There are several Black Loyalists buried in unmarked graves in the Old Burying Ground in Halifax. Many Nova Scotian communities were settled by British regiments that fought in the war . During the War of 1812 , Nova Scotia's contribution to the British war effort involved communities either purchasing or building various privateer ships to attack U.S. vessels. Perhaps
7384-410: The largest municipality in Atlantic Canada , and Canada's second-largest coastal municipality after Vancouver . The land that makes up what is now Nova Scotia was inhabited by the Miꞌkmaq people at the time of European colonization. In 1605, Acadia —France's first New France colony—was founded with the creation of Acadia's capital, Port Royal . The Scots, English, then British, fought France for
7488-599: The most dramatic moment in the war for Nova Scotia occurred when HMS Shannon escorted the captured American frigate USS Chesapeake into Halifax Harbour in 1813. Many of the U.S. prisoners were kept at Deadman's Island . Nova Scotia became the first colony in British North America and in the British Empire to achieve responsible government in January–February 1848 and become self-governing through
7592-421: The obstruction was encountered. This method revolutionized hydrographic surveying, as it allowed a quicker, less laborious, and far more complete survey of an area than did the use of lead lines and sounding poles. From a navigational safety point of view, a wire-drag survey would not miss a hazard to navigation that projected above the drag wire depth. Prior to the advent of sidescan sonar , wire-drag surveying
7696-459: The open water near their facilities surveyed regularly, as do islands in areas subject to variable erosion such as in the Maldives. The history of hydrographic surveying dates almost as far back as that of sailing . For many centuries, a hydrographic survey required the use of lead lines – ropes or lines with depth markings attached to lead weights to make one end sink to the bottom when lowered over
7800-406: The output data set. Those positions are based on the backscatter measurements themselves and not by interpolation from some other derived data set. Consequently, multispectral multibeam imagery is more acute compared to previous multibeam imagery. The inherent precision of the bathymetric data from a multispectral multibeam echosounder is also a benefit to those users that may be attempting to employ
7904-581: The overlapping sets of side scanning across-track grazing angles at the two frequencies were always the same. Following the grounding of the Queen Elizabeth 2 off Cape Cod , Massachusetts , in 1992, the emphasis for shallow water surveying migrated toward full bottom coverage surveys by employing MBES with increasing operating frequencies to further improve the spatial resolution of the soundings. Given that side scan sonar, with its across-track fan-shaped swath of insonification, had successfully exploited
8008-402: The progressive advances in hydrography. In particular, multispectral multibeam echosounders not only provide "multiple look" depth measurements of a seabed, they also provide multispectral backscatter data that are spatially and temporally coincident with those depth measurements. A multispectral multibeam echosounder directly computes a position of origin for each of the backscatter amplitudes in
8112-658: The province were also hit hard, particularly during the last two decades: coal mining in Cape Breton and northern mainland Nova Scotia has virtually ceased, and a large steel mill in Sydney closed during the 1990s. More recently, the high value of the Canadian dollar relative to the US dollar has hurt the forestry industry, leading to the shutdown of a long-running pulp and paper mill near Liverpool . Mining, especially of gypsum and salt and to
8216-404: The province. Michelin is also the province's largest private-sector employer. In July 2024, the provincial government committed CAD$ 18.6 million to build 27 new telecommunication towers to upgrade cellular service province-wide. The Nova Scotia tourism industry includes more than 6,500 direct businesses, supporting nearly 40,000 jobs. Cruise ships pay regular visits to the province. In 2010,
8320-497: The provincial economy each year. To date, 40% of Canada's military assets reside in Nova Scotia. Nova Scotia has the fourth-largest film industry in Canada hosting over 100 productions yearly, more than half of which are the products of international film and television producers. In 2015, the government of Nova Scotia eliminated tax credits to film production in the province, jeopardizing the industry given most other jurisdictions continue to offer such credits. The province also has
8424-399: The region, while returning Cape Breton Island ( Île Royale ) and Prince Edward Island ( Île Saint-Jean ) to the French. Despite the British conquest of Acadia in 1710, Nova Scotia remained primarily occupied by Catholic Acadians and Mi'kmaq, who confined British forces to Annapolis and to Canso. Present-day New Brunswick formed a part of the French colony of Acadia. Immediately after
8528-404: The seabed and the condition of the subsea oilfield infrastructure that interacts with it. Hydrographic offices evolved from naval heritage and are usually found within national naval structures, for example Spain's Instituto Hidrográfico de la Marina . Coordination of those organizations and product standardization is voluntarily joined with the goal of improving hydrography and safe navigation
8632-410: The shallow (peak) soundings in the bottom data were retained in preference to deeper soundings in the sounding record. During that same time period, early side scan sonar was introduced into the operational practices of shallow water hydrographic surveying. The frequencies of the early side scan sonars were a matter of engineering design expediency and the most important aspect of the side scanning echoes
8736-404: The ship a maximum speed of 17 knots (31 km/h; 20 mph). The ship is also equipped with one Caterpillar 398 emergency generator. The ship has a fuel capacity of 1,268.00 m (278,920 imp gal) of diesel fuel , giving the ship a range of 23,100 nautical miles (42,800 km; 26,600 mi) at 10.5 knots (19.4 km/h; 12.1 mph) and an endurance of 105 days. The ship
8840-599: The ship carried out several experiments, among them studies of marine life along the east coast of the Americas, tidal current surveys of Chilean fjords and geographic discoveries in the Pacific Ocean. This voyage, in which over 100 scientists participated during various stages, was documented in the 1973 book "Voyage to the Edge of the World" by Alan Edmonds ISBN 0771030673 . During surveys of Canada's Arctic , Hudson employed
8944-460: The ship. Hudson was forced to return to Canada for repairs. In 1996, Hudson joined the fleet of the Canadian Coast Guard. Hudson contributed to the recovery operations during the recovery operations of Swissair Flight 111 in the waters off of Peggy's Cove, Nova Scotia, Canada during the autumn months of 1998. From 1999 to 2001, Hudson performed surveys in the Sable Island region. In 2007
9048-470: The side of a ship or boat – and sounding poles, which were poles with depth markings which could be thrust over the side until they touched bottom. In either case, the depths measured had to be read manually and recorded, as did the position of each measurement with regard to mapped reference points as determined by three-point sextant fixes. The process was labor-intensive and time-consuming and, although each individual depth measurement could be accurate, even
9152-514: The six-month refit on 25 February. On completion of her refit in mid-2020, the ship's retirement date was estimated as 2024. In 2021, further mechanical problems forced the curtailment of one mission and the cancellation of another. After suffering a starboard engine failure Hudson was decommissioned in January 2022. The replacement, CCGS Naalak Nappaaluk , is not scheduled for delivery until 2024–2025. Oceanographic survey Hydrography
9256-425: The sound waves to reflect off the seabed and return to the receiver is used to calculate the water depth. Unlike other sonars and echo sounders , MBES uses beamforming to extract directional information from the returning soundwaves, producing a swath of depth soundings from a single ping. Explicit inclusion of phraseology like: "For all MBES surveys for LINZ, high resolution, geo-referenced backscatter intensity
9360-545: The standards they have approved, particularly when the use is for the purposes of chart making and distribution or the dredging of state-controlled waters. In the United States, there is coordination with the National Hydrography Dataset in survey collection and publication. State environmental organizations publish hydrographic data relating to their mission. Commercial entities also conduct large-scale hydrographic and geophysical surveying, particularly in
9464-687: The territory on numerous occasions for over a century afterwards, having gained it from them in the 1713 Peace of Utrecht , which ended the War of the Spanish Succession . In subsequent years, the British began settling " foreign Protestants " in the region and deported the French-speaking Acadians en masse . During the American Revolutionary War (1775–1783), thousands of Loyalists settled in Nova Scotia. In 1848, Nova Scotia became
9568-496: The trajectory of technological innovations providing the hydrographic surveying community with better tools for more rapidly acquiring better data for multiple uses. A multispectral multibeam echosounder is the culmination of many progressive advances in hydrography from the early days of acoustic soundings when the primary concern about the strength of returning echoes from the bottom was whether, or not, they would be sufficiently large to be noted (detected). The operating frequencies of
9672-437: The two adjacent cross-track beams. The snippet modification to MBES imagery significantly improved the quality of the imagery by increasing the number of echo amplitude measurements available to be rendered as a pixel in the image and also by having a more uniform spatial distribution of the pixels in the image which represented an actual measured echo amplitude. The introduction of multispectral multibeam echosounders continued
9776-400: The wire-drag method, a wire attached to two ships or boats and set at a certain depth by a system of weights and buoys was dragged between two points. If the wire encountered an obstruction, it would become taut and form a "V" shape. The location of the "V" revealed the position of submerged rocks, wrecks, and other obstructions, while the depth at which the wire was set showed the depth at which
9880-445: The world. Nevertheless, the province's imports far exceed its exports. While these numbers were roughly equal from 1992 until 2004, since that time the trade deficit has ballooned. In 2012, exports from Nova Scotia were 12.1% of provincial GDP, while imports were 22.6%. Nova Scotia's traditionally resource-based economy has diversified in recent decades. The rise of Nova Scotia as a viable jurisdiction in North America, historically,
9984-539: Was CA$ 44,924 , significantly lower than the national average per capita GDP of CA$ 57,574 . GDP growth has lagged behind the rest of the country for at least the past decade. As of 2017, the median family income in Nova Scotia was $ 85,970, below the national average of $ 92,990; in Halifax the figure rises to $ 98,870. The province is the world's largest exporter of Christmas trees , lobster , gypsum , and wild berries . Its export value of fish exceeds $ 1 billion, and fish products are received by 90 countries around
10088-481: Was a noticeable frequency dependency of the measured depths when the bottom was soft (composed primarily of silt, mud or flocculent suspensions). It was observed that higher frequency single vertical beam echosounders could provide detectable echo amplitudes from high porosity sediments, even if those sediments appeared to be acoustically transparent at lower frequencies. In the late 1960s, single-beam hydrographic surveys were conducted using widely spaced track lines and
10192-403: Was apparent that spatially and temporally coincident backscatter from any given seabed at those two widely separated acoustic frequencies, would likely provide two separate and unique images of that seascape. Admittedly, the along-track insonification and receiving beam patterns were different, and due to the absence of bathymetric data, the precise backscatter grazing angles were unknown. However,
10296-538: Was assured in 1895 when Joshua Slocum became the first man to sail single-handedly around the world. International attention continued into the following century with the many racing victories of the Bluenose schooner. Nova Scotia was also the birthplace and home of Samuel Cunard , a British shipping magnate (born at Halifax , Nova Scotia) who founded the Cunard Line. In December 1917, about 2,000 people were killed in
10400-510: Was driven by the ready availability of natural resources, especially the fish stocks off the Scotian Shelf . The fishery was a pillar of the economy since its development as part of New France in the 17th century; however, the fishery suffered a sharp decline due to overfishing in the late 20th century. The collapse of the cod stocks and the closure of this sector resulted in a loss of approximately 20,000 jobs in 1992. Other sectors in
10504-450: Was not the value of their amplitudes, but rather that the amplitudes were spatially variable. In fact, important information was deduced about the shape of the bottom and manmade items on the bottom, based on the regions where there were absences of detectable echo amplitudes (shadows) In 1979, in hopes of a technological solution to the problems of surveying in "floating mud", the Director of
10608-551: Was spotted by the crew over the horizon. When Hudson arrived on scene, they found the tanker Athenian Venture on fire and in two pieces. Hudson recovered only one body from among the wreckage. In the 1990s, Hudson performed surveys in Greenland waters, Rankin Inlet and Chesterfield Inlet . During operations in Greenland waters, ice tore a 15-foot (4.6 m) gash in the hull of
10712-402: Was the only method for searching large areas for obstructions and lost vessels and aircraft. Between 1906 and 1916, Heck expanded the capability of wire-drag systems from a relatively limited area to sweeps covering channels 2 to 3 nautical miles (3.7 to 5.6 km; 2.3 to 3.5 mi) in width. The wire-drag technique was a major contribution to hydrographic surveying during much of the rest of
10816-495: Was transferred to the Canadian Coast Guard in 1996 and decommissioned in 2022. A replacement is not scheduled for delivery until 2024–2025. The first Canadian ship built specifically for hydrographic and oceanographic survey work, Hudson was designed by the Montreal firm of Gilmore, German and Milne. Hudson is 90.4 metres (296 ft 7 in) long overall and 80.8 m (265 ft 1 in) between perpendiculars with
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