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GRASS Projection software is based on PROJ4 originally from USGS, now maintained by Frank Warmerdam. ll -- Lat/Lon utm -- Universe Transverse Mercator stp -- State Plane aea -- Albers Equal Area lcc -- Lambert Conformal Conic merc -- Mercator tmerc -- Transverse Mercator leac -- Lambert Equal Area Conic laea -- Lambert Azimuthal Equal Area aeqd -- Azimuthal Equidistant airy -- Airy aitoff -- Aitoff alsk -- Mod. Stererographics of Alaska apian -- Apian Globular I august -- August Epicycloidal bacon -- Bacon Globular bipc -- Bipolar conic of western hemisphere boggs -- Boggs Eumorphic bonne -- Bonne (Werner lat_1=90) cass -- Cassini cc -- Central Cylindrical cea -- Equal Area Cylindrical chamb -- Chamberlin Trimetric collg -- Collignon crast -- Craster Parabolic (Putnins P4) denoy -- Denoyer Semi-Elliptical eck1 -- Eckert I eck2 -- Eckert II eck3 -- Eckert III eck4 -- Eckert IV eck5 -- Eckert V eck6 -- Eckert VI eqc -- Equidistant Cylindrical (Plate Caree) eqdc -- Equidistant Conic euler -- Euler fahey -- Fahey fouc -- Foucaut fouc_s -- Foucaut Sinusoidal gall -- Gall (Gall Stereographic) gins8 -- Ginsburg VIII (TsNIIGAiK) gn_sinu -- General Sinusoidal Series gnom -- Gnomonic goode -- Goode Homolosine gs48 -- Mod. Stererographics of 48 U.S. gs50 -- Mod. Stererographics of 50 U.S. hammer -- Hammer & Eckert-Greifendorff hatano -- Hatano Asymmetrical Equal Area imw_p -- International Map of the World Polyconic kav5 -- Kavraisky V kav7 -- Kavraisky VII labrd -- Laborde lagrng -- Lagrange larr -- Larrivee lask -- Laskowski lee_os -- Lee Oblated Stereographic loxim -- Loximuthal lsat -- Space oblique for LANDSAT mbt_s -- McBryde-Thomas Flat-Polar Sine (No. 1) mbt_fps -- McBryde-Thomas Flat-Pole Sine (No. 2) mbtfpp -- McBride-Thomas Flat-Polar Parabolic mbtfpq -- McBryde-Thomas Flat-Polar Quartic mbtfps -- McBryde-Thomas Flat-Polar Sinusoidal mil_os -- Miller Oblated Stereographic mill -- Miller Cylindrical mpoly -- Modified Polyconic moll -- Mollweide murd1 -- Murdoch I murd2 -- Murdoch II murd3 -- Murdoch III nell -- Nell nell_h -- Nell-Hammer nicol -- Nicolosi Globular nsper -- Near-sided perspective nzmg -- New Zealand Map Grid ob_tran -- General Oblique Transformation ocea -- Oblique Cylindrical Equal Area oea -- Oblated Equal Area omerc -- Oblique Mercator ortel -- Ortelius Oval ortho -- Orthographic pconic -- Perspective Conic poly -- Polyconic (American) putp1 -- Putnins P1 putp2 -- Putnins P2 putp3 -- Putnins P3 putp3p -- Putnins P3' putp4p -- Putnins P4' putp5 -- Putnins P5 putp5p -- Putnins P5' putp6 -- Putnins P6 putp6p -- Putnins P6' qua_aut -- Quartic Authalic robin -- Robinson rpoly -- Rectangular Polyconic sinu -- Sinusoidal (Sanson-Flamsteed) somerc -- Swiss. Obl. Mercator stere -- Stereographic tcc -- Transverse Central Cylindrical tcea -- Transverse Cylindrical Equal Area tissot -- Tissot tpeqd -- Two Point Equidistant tpers -- Tilted perspective ups -- Universal Polar Stereographic urm5 -- Urmaev V urmfps -- Urmaev Flat-Polar Sinusoidal vandg -- van der Grinten (I) vandg2 -- van der Grinten II vandg3 -- van der Grinten III vandg4 -- van der Grinten IV vitk1 -- Vitkovsky I wag1 -- Wagner I (Kavraisky VI) wag2 -- Wagner II wag3 -- Wagner III wag4 -- Wagner IV wag5 -- Wagner V wag6 -- Wagner VI wag7 -- Wagner VII weren -- Werenskiold I wink1 -- Winkel I wink2 -- Winkel II wintri -- Winkel Tripel