[Mapserver-users] Projection accuracy problems

[Paul Dymecki]

Hi there,
    I was wondering if anyone knows about projection differences between
proj4 and geotrans.  I've tried both but am cannot get the same accuracy
with proj4 as with geotrans.  Here is the proj4 code i'm using in mapscript.
Any help would be much appreciated,

Paul
Code for converting lat/long -> lcc

$lat = 64.16;
$lon = -95.50;

$parms1[0] = "proj=longlat";
$parms1[1] = "ellps=GRS80";
$parms1[2] = "datum=NAD83";
$parms1[3] = "no_defs";
$projLonLat = pj_init($parms1);
$parms2[0] = "proj=lcc";
$parms2[1] = "ellps=GRS80";
$parms2[2] = "datum=NAD83";
$parms2[3] = "lat_0= 49.0";
$parms2[4] = "lon_0= -95.0";
$parms2[5] = "lat_1= 49.0";
$parms2[6] = "lat_2= 77.0";
$parms2[7] = "units=m";
$projLCC = pj_init($parms2);

$ret = pj_transform($projLonLat, $projLCC, $lon, $lat,0 );
$ln = ($ret["u"]);
$lt = ($ret["v"]);
echo "<BR>".$ln."<BR>".$lt;