Space-oblique Mercator projection

Space-oblique Mercator projection

Space-oblique Mercator projection is a map projection.


The Space-oblique Mercator projection (SOM) was developed by John P. Snyder, Alden Partridge Colvocoresses and John L. Junkins in 1976. Snyder had an interest in maps, originating back to his childhood and his regularly attended cartography conferences while on vacation. When the United States Geological Survey (USGS) needed to develop a system for reducing the amount of distortion caused when satellite pictures of the ellipsoidal Earth were printed on a flat page, they appealed for help at one such conference. Snyder worked on the problem armed with his newly purchased pocket calculator and devised the mathematical formulas needed to solve the problem. He submitted these to the USGS at no charge, starting off a new career at USGS. His formulas were used to produce maps from Landsat 4 images launched in the summer of 1978.

Projection description

The Space-oblique Mercator projection provides continual conformal mapping of the swath sensed by a satellite. Scale is true along the ground track, varying 0.01 percent within the normal sensing range of the satellite. Conformality is correct within a few parts per million for the sensing range. Distortion is essentially constant along lines of constant distance parallel to the ground track. SOM is the only projection presented that takes the rotation of Earth into account.


John Hessler, Projecting Time: John Parr Snyder and the Development of the Space Oblique Mercator Projection, Library of Congress, 2003

External links

* - images and projection properties

Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Oblique projection — This article discusses imaging of three dimensional objects. For an abstract mathematical discussion, see Projection (linear algebra) …   Wikipedia

  • Map projection — A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy s Geography and using his second map projection A map projection is any method of representing the surface of a sphere or other …   Wikipedia

  • Alden Partridge Colvocoresses — Col. Alden Partridge Colvocoresses (1918 2007 03 27), USA (Ret.), developed in 1973 1979 the Space oblique Mercator projection with John Parr Snyder and John L. Junkins. Colvocoresses was the first to realize that such a projection was needed and …   Wikipedia

  • List of cartographers — Cartography is the study of map making and cartographers are map makers. Contents 1 Before 1400 2 15th century 3 16th century 4 17th century …   Wikipedia

  • John Parr Snyder — Pour les articles homonymes, voir Snyder. John Parr Snyder (12 avril 1926 28 avril 1997) est un cartographe américain connu pour ses travaux sur les projections cartographiques à l United States Geological Survey (USGS). On… …   Wikipédia en Français

  • John P. Snyder — John Parr Snyder (12 April 1926–28 April 1997) was an American cartographer most known for his work on map projections for the United States Geological Survey (USGS). Educated at Purdue and MIT as a chemical engineer, he had a lifetime interest… …   Wikipedia

  • Colvocoresses Reef — Coordinates: 04°54′S 72°37′E / 4.9°S 72.617°E / 4.9; 72.617 (Colvocoresses Reef …   Wikipedia

  • George Colvocoresses — George Musalas Colvos Colvocoresses (October 22, 1816 June 3, 1872) was a United States Navy officer who commanded the USS Saratoga during the American Civil War. From 1838 up until 1842, he served in the United States Exploring Expedition,… …   Wikipedia

  • History of cartography — The Fra Mauro map, one of the greatest memorial of medieval cartography, was made around 1450 by the Venetian monk Fra Mauro. It is a circular world map drawn on parchment and set in a wooden frame, about two meters in diameter Cartography (from… …   Wikipedia

  • geometry — /jee om i tree/, n. 1. the branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”