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[geo.git] / edit_wp5_web_folder / geo / mapviewer_copy / proj4js / lib / projCode / sinu.js

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-/*******************************************************************************\r
-NAME                           SINUSOIDAL\r
-\r
-PURPOSE:       Transforms input longitude and latitude to Easting and\r
-               Northing for the Sinusoidal projection.  The\r
-               longitude and latitude must be in radians.  The Easting\r
-               and Northing values will be returned in meters.\r
-\r
-PROGRAMMER              DATE            \r
-----------              ----           \r
-D. Steinwand, EROS      May, 1991     \r
-\r
-This function was adapted from the Sinusoidal projection code (FORTRAN) in the \r
-General Cartographic Transformation Package software which is available from \r
-the U.S. Geological Survey National Mapping Division.\r
- \r
-ALGORITHM REFERENCES\r
-\r
-1.  Snyder, John P., "Map Projections--A Working Manual", U.S. Geological\r
-    Survey Professional Paper 1395 (Supersedes USGS Bulletin 1532), United\r
-    State Government Printing Office, Washington D.C., 1987.\r
-\r
-2.  "Software Documentation for GCTP General Cartographic Transformation\r
-    Package", U.S. Geological Survey National Mapping Division, May 1982.\r
-*******************************************************************************/\r
-\r
-Proj4js.Proj.sinu = {\r
-\r
-       /* Initialize the Sinusoidal projection\r
-         ------------------------------------*/\r
-       init: function() {\r
-               /* Place parameters in static storage for common use\r
-                 -------------------------------------------------*/\r
-               this.R = 6370997.0; //Radius of earth\r
-       },\r
-\r
-       /* Sinusoidal forward equations--mapping lat,long to x,y\r
-       -----------------------------------------------------*/\r
-       forward: function(p) {\r
-               var x,y,delta_lon;      \r
-               var lon=p.x;\r
-               var lat=p.y;    \r
-               /* Forward equations\r
-               -----------------*/\r
-               delta_lon = Proj4js.common.adjust_lon(lon - this.long0);\r
-               x = this.R * delta_lon * Math.cos(lat) + this.x0;\r
-               y = this.R * lat + this.y0;\r
-\r
-               p.x=x;\r
-               p.y=y;  \r
-               return p;\r
-       },\r
-\r
-       inverse: function(p) {\r
-               var lat,temp,lon;       \r
-\r
-               /* Inverse equations\r
-                 -----------------*/\r
-               p.x -= this.x0;\r
-               p.y -= this.y0;\r
-               lat = p.y / this.R;\r
-               if (Math.abs(lat) > Proj4js.common.HALF_PI) {\r
-                   Proj4js.reportError("sinu:Inv:DataError");\r
-               }\r
-               temp = Math.abs(lat) - Proj4js.common.HALF_PI;\r
-               if (Math.abs(temp) > Proj4js.common.EPSLN) {\r
-                       temp = this.long0+ p.x / (this.R *Math.cos(lat));\r
-                       lon = Proj4js.common.adjust_lon(temp);\r
-               } else {\r
-                       lon = this.long0;\r
-               }\r
-                 \r
-               p.x=lon;\r
-               p.y=lat;\r
-               return p;\r
-       }\r
-};\r
-\r
-\r