Misplaced Pages

#126873

81-451: The Ethiopia-United States Mapping Mission was a mission of the U.S. Army Corps of Engineers , 64th Engineer Battalion, 29th Engineer Company and U.S. Army Map Service , later U.S. Army Topographic Command (TOPOCOM), Special Foreign Activity during the Cold War in the 1960s to survey and map the entire country of Ethiopia, then under the rule of Emperor Haile Selassie I . Aviation support for

162-553: A Corps of Engineers ... that the said Corps ... shall be stationed at West Point in the State of New York and shall constitute a military academy." Until 1866, the superintendent of the United States Military Academy was always an Engineer Officer. The General Survey Act of 1824 authorized the use of Army engineers to survey road and canal routes for the growing nation. That same year, Congress passed an "Act to Improve

243-515: A cosmology of seven directions. For example, among the Hopi of the Southwestern United States , the four named cardinal directions are not North, South, East and West but are the four directions associated with the places of sunrise and sunset at the winter and summer solstices. Each direction may be associated with a color, which can vary widely between nations, but which is usually one of

324-465: A doctrinal framework for employing capabilities; and remaining an adaptive institution in order to provide Commanders with the freedom of action they need to successfully execute Unified Land Operations. There are several other organizations within the Corps of Engineers: USACE provides support directly and indirectly to the warfighting effort. They build and help maintain much of the infrastructure that

405-410: A fast and efficient process that is still in use today. Gravimeters , small portable units that provide measurements of the force of gravity, were also used by the surveyors to conduct gravity surveys to further understand the topography of the country and the geodetic datum . Field classification specialists, soldiers as well as civilians from Army Map Service, were utilized to conduct research on

486-458: A hand-selected unit of volunteer Army combat engineers trained in jungle warfare, knife fighting, and unarmed jujitsu ( hand-to-hand combat ) techniques. Working in camouflage, the Pioneers cleared jungle, prepared routes of advance and established bridgeheads for the infantry, as well as demolishing enemy installations. Five commanding generals (chiefs of staff after the 1903 reorganization) of

567-598: A large body of water, while taking a series of aerial photographs that overlapped in the direction of flight and across flight lines in order to provide stereoscopic photo coverage of the entire area. Strategically located photo-identifiable points were selected in areas of overlap between photo flight lines and elevations were established on these points by the topographic surveyors using differential levelling techniques. Geographic coordinates and elevations (representing all three dimensions) were later extended by Army Map Service personnel to other strategically located points on

648-454: A major provider of hydroelectric energy and the country's leading provider of recreation. Its role in responding to natural disasters also grew dramatically, especially following the devastating Mississippi Flood of 1927 . In the late 1960s, the agency became a leading environmental preservation and restoration agency. In 1944, specially trained army combat engineers were assigned to blow up underwater obstacles and clear defended ports during

729-502: A new emphasis on a more holistic approach to risk management. As part of this work, USACE is the number one provider of outdoor recreation in the U.S., so there is a significant emphasis on water safety. Army involvement in works "of a civil nature," including water resources, goes back almost to the origins of the U.S. Over the years, as the nation's needs have changed, so have the Army's Civil Works missions. Major areas of emphasis include

810-739: A result of this operation still serve as the base maps for the country of Ethiopia, and are presently being maintained and updated by the Ethiopian Mapping Authority in Addis Ababa. United States Army Corps of Engineers The United States Army Corps of Engineers ( USACE ) is the military engineering branch of the United States Army . A direct reporting unit (DRU), it has three primary mission areas: Engineer Regiment , military construction , and civil works . USACE has 37,000 civilian and military personnel, making it one of

891-466: A special word: tenggara . Sanskrit and other Indian languages that borrow from it use the names of the gods associated with each direction : east (Indra), southeast (Agni), south (Yama/Dharma), southwest (Nirrti), west (Varuna), northwest (Vayu), north (Kubera/Heaven) and northeast (Ishana/Shiva). North is associated with the Himalayas and heaven while the south is associated with the underworld or land of

SECTION 10

#1733085422127

972-563: A terrestrial map because one is looking up instead of down. Similarly, when describing the location of one astronomical object relative to another, "north" means closer to the North celestial pole, "east" means at a higher right ascension , "south" means closer to the South celestial pole, and "west" means at a lower right ascension. If one is looking at two stars that are below the North Star, for example,

1053-578: A typical year, the Corps of Engineers responds to more than 30 Presidential disaster declarations, plus numerous state and local emergencies. Emergency responses usually involve cooperation with other military elements and Federal agencies in support of State and local efforts. Work comprises engineering and management support to military installations, global real estate support, civil works support (including risk and priorities), operations and maintenance of Federal navigation and flood control projects, and monitoring of dams and levees. More than 67 percent of

1134-434: A week. The battalion also deployed in support of post-Katrina operations. All of this work represents a significant investment in the nation's resources. Through its Civil Works program, USACE carries out a wide array of projects that provide coastal protection, flood protection, hydropower, navigable waters and ports, recreational opportunities, and water supply. Work includes coastal protection and restoration, including

1215-500: Is related to I Ching , the Wu Xing and the five naked-eye planets . In traditional Chinese astrology , the zodiacal belt is divided into the four constellation groups corresponding to the directions. Each direction is often identified with a color, and (at least in China) with a mythological creature of that color . Geographical or ethnic terms may contain the name of the color instead of

1296-500: Is responsible for Corps of Engineers policy and plans the future direction of all other USACE organizations. It comprises the executive office and 17 staff principals. USACE has two civilian directors who head up Military and Civil Works programs in concert with their respective DCG for the mission area. The U.S. Army Corps of Engineers is organized geographically into eight permanent divisions, one provisional division, one provisional district, and one research command reporting directly to

1377-499: Is supervised by the civilian Assistant Secretary of the Army (Civil Works) . Three deputy commanding generals (major generals) report to the chief of engineers, who have the following titles: Deputy Commanding General, Deputy Commanding General for Civil and Emergency Operation, and Deputy Commanding General for Military and International Operations. The Corps of Engineers headquarters is located in Washington, D.C. The headquarters staff

1458-584: Is the interesting situation that native Japanese words ( yamato kotoba , kun readings of kanji) are used for the cardinal directions (such as minami for 南, south), but borrowed Chinese words (on readings of kanji) are used for intercardinal directions (such as tō-nan for 東南, southeast, lit. "east-south"). In the Malay language , adding laut (sea) to either east ( timur ) or west ( barat ) results in northeast or northwest, respectively, whereas adding daya to west (giving barat daya ) results in southwest. Southeast has

1539-487: Is used for the center. All five are used for geographic subdivision names ( wilayahs , states, regions, governorates, provinces, districts or even towns), and some are the origin of some Southern Iberian place names (such as Algarve , Portugal and Axarquía , Spain). In Mesoamerica and North America , a number of traditional indigenous cosmologies include four cardinal directions and a center. Some may also include "above" and "below" as directions, and therefore focus on

1620-830: The Army Map Service was primarily provided by the 572nd Engineer Platoon (Topographic Aviation) and civilian pilots under contract, along with some early support from the U.S. Air Force and Ethiopian Airlines . Battalion Headquarters was located in Leghorn ( Livorno ), Italy , and the Mapping Mission itself was headquartered in Addis Ababa , the nation's centrally located capital. The topographic surveyors and their aviation support pilots and crew served on field parties that endured sweltering heat in this Sub Saharan region of Africa . They also struggled to subsist in remote areas of

1701-665: The Federal Emergency Management Agency (FEMA) through its security planning, force protection, research and development, disaster preparedness efforts, and quick response to emergencies and disasters. The CoE conducts its emergency response activities under two basic authorities — the Flood Control and Coastal Emergency Act ( Pub. L.   84–99 ), and the Stafford Disaster Relief and Emergency Assistance Act ( Pub. L.   93–288 ). In

SECTION 20

#1733085422127

1782-699: The Somalia and Sudan borders, where brutal wars and indiscriminate killing had been going on for years, and the area of the country that is now Eritrea , where the Eritrean Liberation Front was engaged in armed struggle with imperial Ethiopian forces as part of the Eritrean War of Independence . According to a country study commissioned by the U.S. Army, the Eritrean War of Independence began in 1961, and intensified in 1962 in response to Ethiopia dissolving

1863-591: The United States Army held engineer commissions early in their careers. All transferred to other branches before being promoted to the top position. They were Alexander Macomb , George B. McClellan , Henry W. Halleck , Douglas MacArthur , and Maxwell D. Taylor . Occasional civil disasters, including the Great Mississippi Flood of 1927 , resulted in greater responsibilities for the Corps of Engineers. The aftermath of Hurricane Katrina in New Orleans and

1944-640: The collapse of the Francis Scott Key Bridge in Baltimore provide other examples of this. The Chief of Engineers and Commanding General (Lt. general) of U.S. Army Corps of Engineers has three mission areas: combat engineers, military construction, and civil works. For each mission area the Chief of Engineers/Commanding General is supervised by a different person. For civil works the Commanding General

2025-515: The Army Corps of Engineers contributed to the success of numerous missions throughout the Civil War. They were responsible for building pontoon and railroad bridges, forts and batteries, destroying enemy supply lines (including railroads), and constructing roads for the movement of troops and supplies. Both sides recognized the critical work of engineers. On 6 March 1861, once the South had seceded from

2106-453: The Army and the Air Force use to train, house, and deploy troops . USACE built and maintained navigation systems and ports provide the means to deploy vital equipment and other material. Corps of Engineers Research and Development (R&D) facilities help develop new methods and measures for deployment, force protection, terrain analysis, mapping, and other support. USACE directly supports

2187-774: The Corps of Engineers in March 1863. Civil works are managed and supervised by the Assistant Secretary of the Army . Army civil works include three U.S. Congress -authorized business lines: navigation, flood and storm damage protection, and aquatic ecosystem restoration. Civil works is also tasked with administering the Clean Water Act Section 404 program, including recreation, hydropower, and water supply at USACE flood control reservoirs, and environmental infrastructure. The civil works staff oversee construction, operation, and maintenance of dams, canals and flood protection in

2268-586: The Engineer Regiment is commanded by the Engineer Commandant, currently a position filled by an Army brigadier general. The Engineer Regiment includes the U.S. Army Engineer School (USAES) which publishes its mission as: Generate the military engineer capabilities the Army needs: training and certifying Soldiers with the right knowledge, skills, and critical thinking; growing and educating professional leaders; organizing and equipping units; establishing

2349-669: The Eritrean-Ethiopian federation. By 1965, the Ethiopian Army devoted a division to fighting the ELF insurgency, including three battalions to guard cities in Eritrea, and a counterinsurgency battalion focused on direct action. The U.S. State Department also noted the effect of the increased insurgency in March 1965, as the Ethiopian government requested an increase in security assistance aid due to

2430-543: The Germanic names for the intermediate directions. Medieval Scandinavian orientation would thus have involved a 45 degree rotation of cardinal directions. In many regions of the world, prevalent winds change direction seasonally, and consequently many cultures associate specific named winds with cardinal and intercardinal directions. For example, classical Greek culture characterized these winds as Anemoi . In pre-modern Europe more generally, between eight and 32 points of

2511-939: The HQ. Within each division, there are several districts. Districts are defined by watershed boundaries for civil works projects and by political boundaries for military projects. U.S. Army engineer units outside of USACE Districts and not listed below fall under the Engineer Regiment of the U.S. Army Corps of Engineers, which comprises the majority of Army engineer soldiers. The Regiment includes combat engineers , whose duties are to breach obstacles; construct fighting positions, fixed/floating bridges, and obstacles and defensive positions; place and detonate explosives; conduct route clearance operations; emplace and detect landmines; and fight as provisional infantry when required. It also includes support engineers, who are more focused on construction and sustainment. Headquartered at Fort Leonard Wood, MO,

Ethiopia – United States Mapping Mission - Misplaced Pages Continue

2592-645: The Navigation of the Ohio and Mississippi Rivers" and to remove sand bars on the Ohio and "planters, sawyers, or snags" (trees fixed in the riverbed) on the Mississippi, for which the Corps of Engineers was identified as the responsible agency. Separately authorized on 4 July 1838, the Corps of Topographical Engineers consisted only of officers and was used for mapping and the design and construction of federal civil works and other coastal fortifications and navigational routes. It

2673-500: The North celestial pole. Similarly, a line from the center to the South celestial pole will define the South point by its intersection with the limb. The points at right angles to the North and South points are the East and West points. Going around the disk clockwise from the North point, one encounters in order the West point, the South point, and then the East point. This is opposite to the order on

2754-527: The U.S., as well as a wide range of public works throughout the world. Some of its dams, reservoirs, and flood control projects also serve as public outdoor recreation facilities. Its hydroelectric projects provide 24% of U.S.  hydropower capacity. The Corps of Engineers is headquartered in Washington, D.C. , and has a budget of $ 7.8 billion (FY2021). The corps's mission is to "deliver vital public and military engineering services; partnering in peace and war to strengthen our nation's security, energize

2835-519: The Union, its legislature passed an act to create a Confederate Corps of Engineers. The South was initially at a disadvantage in engineering expertise; of the initial 65 cadets who resigned from West Point to accept positions with the Confederate Army, only seven were placed in the Corps of Engineers. The Confederate Congress passed legislation that authorized a company of engineers for every division in

2916-511: The United States. The Military Programs Environmental Program manages design and execution of a full range of cleanup and protection activities: The following are major areas of environmental emphasis: Cardinal directions The four cardinal directions , or cardinal points , are the four main compass directions: north , south , east , and west , commonly denoted by their initials N, S, E, and W respectively. Relative to north,

2997-576: The additional directions of up and down . Each of the ten directions has its own name in Sanskrit . Some indigenous Australians have cardinal directions deeply embedded in their culture. For example, the Warlpiri people have a cultural philosophy deeply connected to the four cardinal directions and the Guugu Yimithirr people use cardinal directions rather than relative direction even when indicating

3078-433: The basic colors found in nature and natural pigments, such as black, red, white, and yellow, with occasional appearances of blue, green, or other hues. There can be great variety in color symbolism, even among cultures that are close neighbors geographically. Ten Hindu deities , known as the " Dikpālas ", have been recognized in classical Indian scriptures, symbolizing the four cardinal and four intercardinal directions with

3159-415: The center as a fifth cardinal point . Central Asian , Eastern European and North East Asian cultures frequently have traditions associating colors with four or five cardinal points. Systems with five cardinal points (four directions and the center) include those from pre-modern China , as well as traditional Turkic , Tibetan and Ainu cultures. In Chinese tradition, the five cardinal point system

3240-658: The compass – cardinal and intercardinal directions – were given names. These often corresponded to the directional winds of the Mediterranean Sea (for example, southeast was linked to the Sirocco , a wind from the Sahara). Particular colors are associated in some traditions with the cardinal points. These are typically " natural colors " of human perception rather than optical primary colors . Many cultures, especially in Asia , include

3321-454: The country that included jungles, deserts, dense bush, mountains and swamps that harbored deadly snakes, crocodiles, lions, leopards, hyenas, hippos, cape buffalo, elephants, wild dogs, dangerous bees and ants, aggressive tribes of baboons and sometimes hostile natives, not to mention any number of malignant diseases. In addition, these troops and their support personnel were frequently required to conduct their operations in active war zones along

Ethiopia – United States Mapping Mission - Misplaced Pages Continue

3402-534: The creation of a "Chief Engineer for the Army". Congress authorized a corps of engineers for the United States on 11 March 1779. The Corps as it is known today came into being on 16 March 1802, when the president was authorized to "organize and establish a Corps of Engineers ... that the said Corps ... shall be stationed at West Point in the State of New York and shall constitute a Military Academy ." A Corps of Topographical Engineers , authorized on 4 July 1838, merged with

3483-424: The directions east, south, and west are at 90 degree intervals in the clockwise direction. The ordinal directions (also called the intercardinal directions ) are northeast (NE), southeast (SE), southwest (SW), and northwest (NW). The intermediate direction of every set of intercardinal and cardinal direction is called a secondary intercardinal direction. These eight shortest points in the compass rose shown to

3564-576: The disruption caused by "Eritrean dissidence." In at least one case, a survey team was taken captive by insurgent members of the Eritrean Liberation Front (ELF) in July 1965. The team consisted of CW3 Jack Kalmbach (UH-1 pilot), Specialist 4 Ronald Dolecki (field classifier), and Habte Mesmer (Ethiopian interpreter). The ELF burned the helicopter and marched the captives approximately 150 miles into Sudan. After 12 days, Dolecki successfully escaped, and

3645-579: The economy and reduce risks from disasters." Its most visible civil works missions include: The history of United States Army Corps of Engineers can be traced back to the American Revolution . On 16 June 1775, the Continental Congress organized the Corps of Engineers, whose initial staff included a chief engineer and two assistants. Colonel Richard Gridley became General George Washington 's first chief engineer. One of his first tasks

3726-591: The fathers (Pitr loka). The directions are named by adding "disha" to the names of each god or entity: e.g. Indradisha (direction of Indra) or Pitrdisha (direction of the forefathers i.e. south). The cardinal directions of the Hopi language and the Tewa dialect spoken by the Hopi-Tewa are related to the places of sunrise and sunset at the solstices, and correspond approximately to the European intercardinal directions. Use of

3807-647: The field; by 1865, the CSA had more engineer officers serving in the field of action than the Union Army. One of the main projects for the Army Corps of Engineers was constructing railroads and bridges. Union forces took advantage of such Confederate infrastructure because railroads and bridges provided access to resources and industry. The Confederate engineers, using slave labor, built fortifications that were used both offensively and defensively, along with trenches that made them harder to penetrate. This method of building trenches

3888-782: The following degrees of a compass: The intercardinal (intermediate, or, historically, ordinal ) directions are the four intermediate compass directions located halfway between each pair of cardinal directions. These eight directional names have been further compounded known as tertiary intercardinal directions, resulting in a total of 32 named points evenly spaced around the compass: north (N), north by east (NbE), north-northeast (NNE), northeast by north (NEbN), northeast (NE), northeast by east (NEbE), east-northeast (ENE), east by north (EbN), east (E), etc. Cardinal directions or cardinal points may sometimes be extended to include vertical position ( elevation , altitude , depth ): north and south , east and west , up and down; or mathematically

3969-1120: The following: The U.S. Army Corps of Engineers environmental mission has two major focus areas: restoration and stewardship . The Corps supports and manages numerous environmental programs, that run the gamut from cleaning up areas on former military installations contaminated by hazardous waste or munitions to helping establish/reestablish wetlands that helps endangered species survive. Some of these programs include Ecosystem Restoration, Formerly Used Defense Sites, Environmental Stewardship, EPA Superfund , Abandoned Mine Lands, Formerly Utilized Sites Remedial Action Program , Base Realignment and Closure, 2005 , and Regulatory. This mission includes education as well as regulation and cleanup. The U.S. Army Corps of Engineers has an active environmental program under both its Military and Civil Programs. The Civil Works environmental mission that ensures all USACE projects, facilities and associated lands meet environmental standards. The program has four functions: compliance, restoration, prevention, and conservation. The Corps also regulates all work in wetlands and waters of

4050-586: The goods consumed by Americans and more than half of the nation's oil imports are processed through deepwater ports maintained by the Corps of Engineers, which maintains more than 12,000 miles (19,000 km) of commercially navigable channels across the U.S. In both its Civil Works mission and Military Construction program, the Corps of Engineers is responsible for billions of dollars of the nation's infrastructure. For example, USACE maintains direct control of 609 dams, maintains or operates 257 navigation locks, and operates 75 hydroelectric facilities generating 24% of

4131-403: The ground in order to provide names of cities and towns and any other prominent named features, as well as classify types of roads, buildings, hydrographic features such as lakes and rivers, and any other features to be depicted on the maps. Interpreters were used to interview local officials and residents to determine proper names, spelling and usage of features. The Ethiopia-U.S. Mapping Mission

SECTION 50

#1733085422127

4212-454: The intercardinal directions have names that are not compounds of the names of the cardinal directions (as, for instance, northeast is compounded from north and east ). In Estonian, those are kirre (northeast), kagu (southeast), edel (southwest), and loe (northwest), in Finnish koillinen (northeast), kaakko (southeast), lounas (southwest), and luode (northwest). In Japanese, there

4293-617: The invasion of Normandy. During World War II, the Army Corps of Engineers in the European Theater of Operations was responsible for building numerous bridges, including the first and longest floating tactical bridge across the Rhine at Remagen , and building or maintaining roads vital to the Allied advance across Europe into the heart of Germany. In the Pacific theater, the "Pioneer troops" were formed,

4374-552: The location of the aircraft (and therefore the aerial photo camera station) with respect to known stations on the ground was controlled horizontally by a system known as HIRAN (High Range Navigation Radar), a large and heavy system that required a large aircraft, such as the RB-50 . High-quality horizontal geodetic control was established by the topographic surveyors on the bulky HIRAN ground stations by measuring their cardinal direction distances from nearby photo-identifiable points on which

4455-638: The mid-19th century, Corps of Engineers' officers ran Lighthouse Districts in tandem with U.S. Naval officers. The Army Corps of Engineers played a significant role in the American Civil War . Many of the men who would serve in the top leadership in this organization were West Point graduates. Several rose to military fame and power during the Civil War. Some examples include Union generals George McClellan , Henry Halleck , and George Meade ; and Confederate generals Robert E. Lee , Joseph Johnston , and P.G.T. Beauregard . The versatility of officers in

4536-606: The military construction mission on 1 December 1941, after the Quartermaster Department struggled with the expanding mission, the Corps built facilities at home and abroad to support the U.S. Army and Air Force. During World War II the USACE program expanded to more than 27,000 military and industrial projects in a $ 15.3 billion mobilization effort. Included were aircraft, tank assembly, and ammunition plants; camps for 5.3 million soldiers; depots, ports, and hospitals; and

4617-627: The military construction mission, the chief of engineers is directed and supervised by the Assistant Secretary of the Army for installations, environment, and energy, whom the President appoints and the Senate confirms. Military construction relates to construction on military bases and worldwide installations. On 16 June 1775, the Continental Congress , gathered in Philadelphia , granted authority for

4698-480: The military in the battle zone, making expertise available to commanders to help solve or avoid engineering (and other) problems. Forward Engineer Support Teams, FEST-A's or FEST-M's, may accompany combat engineers to provide immediate support, or to reach electronically into the rest of USACE for the necessary expertise. A FEST-A team is an eight-person detachment; a FEST-M is approximately 36. These teams are designed to provide immediate technical-engineering support to

4779-422: The name of the corresponding direction. East: Green ( 青 "qīng" corresponds to both green and blue); Spring; Wood South: Red ; Summer; Fire West: White ; Autumn; Metal North: Black ; Winter; Water Center: Yellow ; Earth Countries where Arabic is used refer to the cardinal directions as Ash Shamal (N), Al Gharb (W), Ash Sharq (E) and Al Janoob (S). Additionally, Al Wusta

4860-440: The nation's hydropower and three percent of its total electricity. USACE inspects over 2,000 Federal and non-Federal levees every two years. Four billion gallons of water per day are drawn from the Corps of Engineers' 136 multi-use flood control projects comprising 9,800,000 acre-feet (12.1 km ) of water storage, making it one of the United States' largest water supply agencies. The 249th Engineer Battalion (Prime Power) ,

4941-606: The one that is "east" will actually be further to the left. During the Migration Period , the Germanic names for the cardinal directions entered the Romance languages , where they replaced the Latin names borealis (or septentrionalis ) with north, australis (or meridionalis ) with south, occidentalis with west and orientalis with east. It is possible that some northern people used

SECTION 60

#1733085422127

5022-415: The only active duty unit in USACE, generates and distributes prime electrical power in support of warfighting, disaster relief, stability and support operations as well as provides advice and technical assistance in all aspects of electrical power and distribution systems. The battalion deployed in support of recovery operations after 9/11 and was instrumental in getting Wall Street back up and running within

5103-457: The other captives were eventually released. The U.S. government characterized the insurgents as "well armed bandits," apparently an attempt to appease the Ethiopian government. As a consequence of the attacks, the Ethiopian Army began escorting the survey teams. This had already been authorized per the 1953 defense installation treaty between the U.S. and Ethiopia, which authorized the mapping survey and allowed "Ethiopian security forces" to accompany

5184-533: The photos using computers and analytical methods of photogrammetric modeling. These computer-generated photo control points were then used to compile, or draw, the planimetric map to the desired scale and delineate its contours from stereo models of the photos using special stereoscopic mapping equipment. Once the map images were drawn in detail to uniform scale and made into detailed map reproducibles through photographic processes, printing plates were produced and maps were printed in volume on an offset printing press ,

5265-484: The position of an object close to their body. (For more information, see: Cultures without relative directions .) The precise direction of the cardinal points appears to be important in Aboriginal stone arrangements . Many aboriginal languages contain words for the usual four cardinal directions, but some contain words for 5 or even 6 cardinal directions. In some languages , such as Estonian , Finnish and Breton ,

5346-626: The rapid construction of such landmark projects such as the Manhattan Project at Los Alamos, Hanford and Oak Ridge among other places, and the Pentagon , the Department of Defense headquarters across the Potomac from Washington, DC. In civilian projects, the Corps of Engineers became the lead federal navigation and flood control agency. Congress significantly expanded its civil works activities, becoming

5427-519: The right are: Points between the cardinal directions form the points of the compass . Arbitrary horizontal directions may be indicated by their azimuth angle value. The directional names are routinely associated with azimuths , the angle of rotation (in degrees ) in the unit circle over the horizontal plane . It is a necessary step for navigational calculations (derived from trigonometry ) and for use with Global Positioning System (GPS) receivers . The four cardinal directions correspond to

5508-404: The six directions of the x-, y-, and z-axes in three-dimensional Cartesian coordinates . Topographic maps include elevation, typically via contour lines . Alternatively, elevation angle may be combined with cardinal direction (or, more generally, arbitrary azimuth angle) to form a local spherical coordinate system . In astronomy , the cardinal points of an astronomical body as seen in

5589-449: The sky are four points defined by the directions toward which the celestial poles lie relative to the center of the disk of the object in the sky. A line (a great circle on the celestial sphere ) from the center of the disk to the North celestial pole will intersect the edge of the body (the " limb ") at the North point. The North point will then be the point on the limb that is closest to

5670-422: The survey teams outside of installations. In October 1965, another survey team was attacked by insurgents, resulting in one Ethiopian soldier wounded and one ELF insurgent killed in action. The aerial photography used by the Ethiopia-United States Mapping Mission was flown by the U.S. Air Force, normally at an altitude above 30,000 feet for optimum coverage. The geographic coordinates ( latitude and longitude ) of

5751-425: The surveyors established horizontal positions using theodolites and electronic distance meters (EDM) and triangulation and traverse techniques. A device known as a Terrain Profile Recorder (TPR), which used the boiling point of a liquid chemical at a specific altitude and a gyroscopically stabilized radar altimeter was used to determine and maintain the altitude of the aircraft above a known elevation, such as

5832-847: The three mission areas are administered by a lieutenant general known as the chief of engineers /commanding general. The chief of engineers commands the Engineer Regiment, comprising combat engineer , rescue, construction, dive, and other specialty units, and answers directly to the Chief of Staff of the Army . Combat engineers, sometimes called sappers , form an integral part of the Army's combined arms team and are found in all Army service components: Regular Army, National Guard , and Army Reserve . Their duties are to breach obstacles; construct fighting positions, fixed/floating bridges, and obstacles and defensive positions; place and detonate explosives; conduct route clearance operations; emplace and detect landmines; and fight as provisional infantry when required. For

5913-568: The warfighter or in a disaster area. Corps of Engineers' professionals use the knowledge and skills honed on both military and civil projects to support the U.S. and local communities in the areas of real estate, contracting, mapping, construction, logistics, engineering, and management experience. Prior to their respective troop withdrawals in 2021, this included support for rebuilding Iraq , establishing infrastructure in Afghanistan , and supporting international and inter-agency services. In addition,

5994-470: The work of almost 26,000 civilians on civil-works programs throughout USACE provides a training ground for similar capabilities worldwide. USACE civilians volunteer for assignments worldwide. For example, hydropower experts have helped repair, renovate, and run hydropower dams in Iraq in an effort to help get Iraqis to become self-sustaining. USACE supports the United States' Department of Homeland Security and

6075-503: The world's largest public engineering, design, and construction management agencies. The USACE workforce is approximately 97% civilian, 3% active duty military. The civilian workforce is primarily located in the United States, Europe and in select Middle East office locations. Civilians do not function as active duty military and are not required to be in active war and combat zones; however, volunteer (with pay) opportunities do exist for civilians to do so. The day-to-day activities of

6156-592: Was activated in July 1963 and during its lifespan involved about a thousand U.S. military and civilian personnel. It was closed out in July 1970 after its topographic surveying mission in Ethiopia was complete. Photogrammetric and cartographic map finishing operations based on these surveys were subsequently completed by Army Map Service/TOPOCOM in Bethesda , Maryland . The primary 1:250,000-scale map series and 1:50,000-scale maps of special interest areas that were created as

6237-621: Was appointed colonel and commander of all engineers in the Continental Army and, on 17 November 1777, he was promoted to brigadier general. When the Continental Congress created a separate Corps of Engineers in May 1779, Duportail was appointed as its commander. In late 1781 he directed the construction of the allied U.S.-French siege works at the Battle of Yorktown . On 26 February 1783, the Corps

6318-574: Was disbanded. It was re-established during the Presidency of George Washington . From 1794 to 1802, the engineers were combined with the artillery as the Corps of Artillerists and Engineers . The Corps of Engineers, as it is known today, was established on 16 March 1802, when President Thomas Jefferson signed the Military Peace Establishment Act , whose aim was to "organize and establish

6399-568: Was known as the zigzag pattern. The National Defense Act of 1916 authorized a reserve corps in the Army, and the Engineer Officers' Reserve Corps and the Engineer Enlisted Reserve Corps became one of the branches. Some of these personnel were called into active service for World War I . From the beginning, many politicians wanted the Corps of Engineers to contribute to both military construction and civil works. Assigned

6480-744: Was merged with the Corps of Engineers on 31 March 1863, at which point the Corps of Engineers also assumed the Lakes Survey District mission for the Great Lakes . In 1841, Congress created the Lake Survey . The survey, based in Detroit, Michigan, was charged with conducting a hydrographical survey of the Northern and Northwestern lakes and preparing and publishing nautical charts and other navigation aids. The Lake Survey published its first charts in 1852. In

6561-637: Was to build fortifications near Boston at Bunker Hill . The Continental Congress recognized the need for engineers trained in military fortifications and asked the government of King Louis XVI of France for assistance. Many of the early engineers in the Continental Army were former French officers. Louis Lebègue Duportail , a lieutenant colonel in the French Royal Corps of Engineers, was secretly sent to North America in March 1777 to serve in George Washington 's Continental Army . In July 1777 he

#126873