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delphine |
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<?php
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/**
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* Author : Julien Moquet
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*
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* Inspired by Proj4php from Mike Adair madairATdmsolutions.ca
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* and Richard Greenwood rich@greenwoodma$p->com
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* License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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*/
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/*******************************************************************************
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NAME MILLER CYLINDRICAL
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PURPOSE: Transforms input longitude and latitude to Easting and
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Northing for the Miller Cylindrical projection. The
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longitude and latitude must be in radians. The Easting
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and Northing values will be returned in meters.
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PROGRAMMER DATE
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---------- ----
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T. Mittan March, 1993
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This function was adapted from the Lambert Azimuthal Equal Area projection
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code (FORTRAN) in the General Cartographic Transformation Package software
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which is available from the U.S. Geological Survey National Mapping Division.
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ALGORITHM REFERENCES
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1. "New Equal-Area Map Projections for Noncircular Regions", John P. Snyder,
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The American Cartographer, Vol 15, No. 4, October 1988, pp. 341-355.
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2. Snyder, John P., "Map Projections--A Working Manual", U.S. Geological
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Survey Professional Paper 1395 (Supersedes USGS Bulletin 1532), United
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State Government Printing Office, Washington D.C., 1987.
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3. "Software Documentation for GCTP General Cartographic Transformation
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Package", U.S. Geological Survey National Mapping Division, May 1982.
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* ***************************************************************************** */
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class Proj4phpProjMill {
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/* Initialize the Miller Cylindrical projection
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------------------------------------------- */
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public function init() {
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//no-op
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}
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/* Miller Cylindrical forward equations--mapping lat,long to x,y
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------------------------------------------------------------ */
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public function forward( $p ) {
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$lon = $p->x;
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$lat = $p->y;
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/* Forward equations
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----------------- */
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$dlon = Proj4php::$common->adjust_lon( $lon - $this->long0 );
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$x = $this->x0 + $this->a * $dlon;
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$y = $this->y0 + $this->a * log( tan( (Proj4php::$common->PI / 4.0) + ($lat / 2.5) ) ) * 1.25;
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$p->x = $x;
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$p->y = $y;
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return $p;
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}
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/* Miller Cylindrical inverse equations--mapping x,y to lat/long
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------------------------------------------------------------ */
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public function inverse( $p ) {
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$p->x -= $this->x0;
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$p->y -= $this->y0;
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$lon = Proj4php::$common->adjust_lon( $this->long0 + $p->x / $this->a );
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$lat = 2.5 * (atan( exp( 0.8 * $p->y / $this->a ) ) - Proj4php::$common->PI / 4.0);
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$p->x = $lon;
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$p->y = $lat;
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return $p;
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}
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}
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Proj4php::$proj['mill'] = new Proj4phpProjMill();
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