##### ## Mapx Projection List ## Written by Scott Lewis ## (C)2008, National Snow and Ice Data Center ## ## This file lists all projections currently supported by the Mapx library. ## The Projection Name listed should be used when creating a projection with ## the MapMaker class (though the spaces and punctuation can be removed). ## Also listed are the lat0, lon0, lat1, and lon1 variables and how they are ## used with the projection. If the projection uses an elliptical spheroid ## it will be noted as well. ## ## If not noted, the scale variable is the scale at the projection center. ##### ------ AZIMUTHAL EQUAL-AREA lat0 - Latitude of projection center lon0 - Longitude of projection center lat1 - Not used lon1 - Not used ------ AZIMUTHAL EQUAL-AREA ELLIPSOID lat0 - Latitude of projection center lon0 - Longitude of projection center lat1 - Not used lon1 - Not used THIS IS AN ELLIPTICAL PROJECTION ------ CYLINDRICAL EQUAL-AREA lat0 - Not used lon0 - Central Meridian for projection lat1 - Standard Parallel for projection lon1 - Not used ------ CYLINDRICAL EQUAL-AREA ELLIPSOID lat0 - Not used lon0 - Central Meridian for projection lat1 - Standard Parallel for projection lon1 - Not used THIS IS AN ELLIPTICAL PROJECTION ------ CYLINDRICAL EQUIDISTANT lat0 - Not used lon0 - Central Meridian for projection lat1 - Standard Parallel for projection lon0 - Not used ------ LAMBERT CONIC CONFORMAL ELLIPSOID lat0 - Standard Parallel #1 for projection lon0 - Central Meridian for projection lat1 - Standard Parallel #2 for projection lon1 - Not used THIS IS AN ELLIPTICAL PROJECTION ------ MERCATOR lat0 - Not used lon0 - Central Meridian for projection lat1 - Not used lon1 - Not used ------ MERCATOR (TRANSVERSE) lat0 - Latitude of projection origin lon0 - Longitude of projection origin lat1 - Not used lon1 - Not used scale: This is the scale factor along the central meridian ------ MOLLWEIDE lat0 - Not used lon0 - Central Meridian for projection lat1 - Not used lon1 - Not used ------ ORTHOGRAPHIC lat0 - Not used lon0 - Central Meridian for projection lat1 - Standard Parallel for projection lon1 - Not used ------ POLAR STEREOGRAPHIC lat0 - Latitude of projection origin lon0 - Longitude of projection origin lat1 - Not used lon1 - Not used ------ POLAR STEREOGRAPHIC ELLIPSOID lat0 - Latitude of projection origin lon0 - Longitude of projection origin lat1 - Latitude of "true scale" for projection lon1 - Not used scale: The scale factor at lat1 THIS IS AN ELLIPTICAL PROJECTION ------ SINUSOIDAL lat0 - Not used lon0 - Central Meridian for projection lat1 - Not used lon1 - Not used