GS50 projection
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/GS50_projection.png/350px-GS50_projection.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/GS-50_projection_with_lines_of_constant_scale.svg/220px-GS-50_projection_with_lines_of_constant_scale.svg.png)
GS50 is a map projection that was developed by John Parr Snyder of the USGS in 1982.
The GS50 projection provides a conformal projection suitable only for maps of the 50 United States. Scale varies less than 2% throughout the area covered. Distortion is very low as well. It is not a standard projection in the sense that it uses complex polynomials (of the tenth order) rather than a trigonometric formulation, though it was developed from an oblique stereographic projection.
References
- Snyder, John Parr (1985). "Computer-assisted map projection research" (Abstract + pdf (74Mb)). Bulletin. 1629. United States Geological Survey: 79–92, 147–51. Retrieved 26 March 2013.
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- Snyder, John Parr (1987). "Map Projections: A Working Manual" (Abstract + pdf (22Mb)). Professional Paper. 1395. United States Geological Survey: 203–212. Retrieved 26 March 2013.
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