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/trunk/scripts/modules/ifn/bibliotheque/proj4php/projCode/poly.php
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<?php
/**
* Author : Julien Moquet
*
* Inspired by Proj4php from Mike Adair madairATdmsolutions.ca
* and Richard Greenwood rich@greenwoodma$p->com
* License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
*/
 
 
/* Function to compute, phi4, the latitude for the inverse of the
Polyconic projection.
------------------------------------------------------------ */
function phi4z( $eccent, $e0, $e1, $e2, $e3, $a, $b, &$c, $phi ) {
/*
$sinphi;
$sin2ph;
$tanph;
$ml;
$mlp;
$con1;
$con2;
$con3;
$dphi;
$i;
*/
 
$phi = $a;
for( $i = 1; $i <= 15; $i++ ) {
$sinphi = sin( $phi );
$tanphi = tan( $phi );
$c = $tanphi * sqrt( 1.0 - $eccent * $sinphi * $sinphi );
$sin2ph = sin( 2.0 * $phi );
/*
ml = e0 * *phi - e1 * sin2ph + e2 * sin (4.0 * *phi);
mlp = e0 - 2.0 * e1 * cos (2.0 * *phi) + 4.0 * e2 * cos (4.0 * *phi);
*/
$ml = $e0 * $phi - $e1 * $sin2ph + $e2 * sin( 4.0 * $phi ) - $e3 * sin( 6.0 * $phi );
$mlp = $e0 - 2.0 * $e1 * cos( 2.0 * $phi ) + 4.0 * $e2 * cos( 4.0 * $phi ) - 6.0 * $e3 * cos( 6.0 * $phi );
$con1 = 2.0 * $ml + $c * ($ml * $ml + $b) - 2.0 * $a * ($c * $ml + 1.0);
$con2 = $eccent * $sin2ph * ($ml * $ml + $b - 2.0 * $a * $ml) / (2.0 * $c);
$con3 = 2.0 * ($a - $ml) * ($c * $mlp - 2.0 / $sin2ph) - 2.0 * $mlp;
$dphi = $con1 / ($con2 + $con3);
$phi += $dphi;
if( abs( $dphi ) <= .0000000001 )
return($phi);
}
Proj4php::reportError( "phi4z: No convergence" );
return null;
}
 
/* Function to compute the constant e4 from the input of the eccentricity
of the spheroid, x. This constant is used in the Polar Stereographic
projection.
-------------------------------------------------------------------- */
function e4fn( $x ) {
#$con;
#$com;
$con = 1.0 + $x;
$com = 1.0 - $x;
return (sqrt( (pow( $con, $con )) * (pow( $com, $com )) ));
}
 
/* * *****************************************************************************
NAME POLYCONIC
 
PURPOSE: Transforms input longitude and latitude to Easting and
Northing for the Polyconic projection. The
longitude and latitude must be in radians. The Easting
and Northing values will be returned in meters.
 
PROGRAMMER DATE
---------- ----
T. Mittan Mar, 1993
 
ALGORITHM REFERENCES
 
1. Snyder, John P., "Map Projections--A Working Manual", U.S. Geological
Survey Professional Paper 1395 (Supersedes USGS Bulletin 1532), United
State Government Printing Office, Washington D.C., 1987.
 
2. Snyder, John P. and Voxland, Philip M., "An Album of Map Projections",
U.S. Geological Survey Professional Paper 1453 , United State Government
Printing Office, Washington D.C., 1989.
* ***************************************************************************** */
 
class Proj4phpProjPoly {
/* Initialize the POLYCONIC projection
---------------------------------- */
public function init() {
#$temp; /* temporary variable */
if( $this->lat0 == 0 )
$this->lat0 = 90; //$this->lat0 ca
 
/* Place parameters in static storage for common use
------------------------------------------------- */
$this->temp = $this->b / $this->a;
$this->es = 1.0 - pow( $this->temp, 2 ); // devait etre dans tmerc.js mais n y est pas donc je commente sinon retour de valeurs nulles
$this->e = sqrt( $this->es );
$this->e0 = Proj4php::$common->e0fn( $this->es );
$this->e1 = Proj4php::$common->e1fn( $this->es );
$this->e2 = Proj4php::$common->e2fn( $this->es );
$this->e3 = Proj4php::$common->e3fn( $this->es );
$this->ml0 = Proj4php::$common->mlfn( $this->e0, $this->e1, $this->e2, $this->e3, $this->lat0 ); //si que des zeros le calcul ne se fait pas
//if (!$this->ml0) {$this->ml0=0;}
}
 
/* Polyconic forward equations--mapping lat,long to x,y
--------------------------------------------------- */
public function forward( $p ) {
/*
$sinphi;
$cosphi; // sin and cos value
$al; // temporary values
$c; // temporary values
$con;
$ml; // cone constant, small m
$ms; // small m
$x;
$y;
*/
$lon = $p->x;
$lat = $p->y;
 
$con = Proj4php::$common->adjust_lon( $lon - $this->long0 );
if( abs( $lat ) <= .0000001 ) {
$x = $this->x0 + $this->a * $con;
$y = $this->y0 - $this->a * $this->ml0;
} else {
$sinphi = sin( $lat );
$cosphi = cos( $lat );
$ml = Proj4php::$common->mlfn( $this->e0, $this->e1, $this->e2, $this->e3, $lat );
$ms = Proj4php::$common->msfnz( $this->e, $sinphi, $cosphi );
$x = $this->x0 + $this->a * $ms * sin( $sinphi ) / $sinphi;
$y = $this->y0 + $this->a * ($ml - $this->ml0 + $ms * (1.0 - cos( $sinphi )) / $sinphi);
}
 
$p->x = $x;
$p->y = $y;
return $p;
}
 
/* Inverse equations
----------------- */
public function inverse( $p ) {
/*
$sin_phi;
$cos_phi; // sin and cos values
$al; // temporary values
$b; // temporary values
$c; // temporary values
$con;
$ml; // cone constant, small m
$iflg; // error flag
$lon;
$lat;
*/
$p->x -= $this->x0;
$p->y -= $this->y0;
$al = $this->ml0 + $p->y / $this->a;
$iflg = 0;
 
if( abs( $al ) <= .0000001 ) {
$lon = $p->x / $this->a + $this->long0;
$lat = 0.0;
} else {
$b = $al * $al + ($p->x / $this->a) * ($p->x / $this->a);
$iflg = phi4z( $this->es, $this->e0, $this->e1, $this->e2, $this->e3, $this->al, $b, $c, $lat );
if( $iflg != 1 )
return($iflg);
$lon = Proj4php::$common->adjust_lon( (Proj4php::$common->asinz( $p->x * $c / $this->a ) / sin( $lat )) + $this->long0 );
}
 
$p->x = $lon;
$p->y = $lat;
return $p;
}
 
}
 
Proj4php::$proj['poly'] = new Proj4phpProjPoly();