[OpenLayers-Users] How do I transform deg decimal to TransverseMercator projection NAD27

[Robert Sanson]

Hi Joel
 
This is how I do something similar. I use proj4 - with appropriate projection files specified:
 

 <script src="lib/proj4js-combined.js"></script>
 <script src="lib/EPSG2193.js"></script>
 <script src="lib/EPSG4326.js"></script>
Here is the code that does the re-projection:
 
src = new OpenLayers.Projection('EPSG:4326');
dest = new OpenLayers.Projection('EPSG:2193');
markergeom = new OpenLayers.Geometry.Point(gpsx,gpsy);
//now in-place re-projection
OpenLayers.Projection.transform(markergeom, src, dest); 
gpsx = markergeom.x;
gpsy = markergeom.y;
alert("from WGS84:" + gpsx + "," + gpsy);
 
Regards,
 
Robert Sanson

>>> Joel <joel at srcti.com> 17/02/2010 6:11 a.m. >>>

How do I transform deg decimal to Transverse Mercator projection for the
following?


SRS WKT:  PROJCS["NAD27 / Illinois East", GEOGCS["NAD27", DATUM["North
American Datum 1927", SPHEROID["Clarke 1866", 6378206.4, 294.9786982138982,
AUTHORITY["EPSG","7008"]], TOWGS84[-4.2, 135.4, 181.9, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6267"]], PRIMEM["Greenwich", 0.0,
AUTHORITY["EPSG","8901"]], UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST], AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4267"]], PROJECTION["Transverse Mercator",
AUTHORITY["EPSG","9807"]], PARAMETER["central_meridian",
-88.33333333333333], PARAMETER["latitude_of_origin", 36.666666666666664],
PARAMETER["scale_factor", 0.999975], PARAMETER["false_easting", 500000.0],
PARAMETER["false_northing", 0.0], UNIT["foot_survey_us",
0.30480060960121924], AXIS["Easting", EAST], AXIS["Northing", NORTH],
AUTHORITY["EPSG","26771"]]  
Native SRS WKT:  PROJCS["NAD_1983_StatePlane_Illinois_East_FIPS_1201_Feet",
GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983",
SPHEROID["GRS_1980", 6378137.0, 298.257222101]], PRIMEM["Greenwich", 0.0],
UNIT["degree", 0.017453292519943295], AXIS["Longitude", EAST],
AXIS["Latitude", NORTH]], PROJECTION["Transverse_Mercator"],
PARAMETER["central_meridian", -88.33333333333333],
PARAMETER["latitude_of_origin", 36.666666666666664],
PARAMETER["scale_factor", 0.999975], PARAMETER["false_easting", 984250.0],
PARAMETER["false_northing", 0.0], UNIT["foot_survey_us",
0.3048006096012192], AXIS["X", EAST], AXIS["Y", NORTH]]


I have tried numerious combinations including :

        var proj3 = new OpenLayers.Projection("EPSG:4326");
        var proj1 = new OpenLayers.Projection("EPSG:900913");
        itemloc = new OpenLayers.LonLat(gpslon2, gpslat2);
        itemloc.transform( proj3, proj1);

I end up with:
        -87.66646666666666 lon: -9758986.427620362 deglat: 41.90336666666667
lat: 5146515.211664708
should be:
        -87.66646666666666 lon: 1160049.27959 deglat: 41.90336666666667 lat:
1912889.44114

        -87.68734166666668 lon: -9761310.22199035 deglat: 41.91610833333334
lat: 5148421.150384361
should be:
        -87.68734166666668 lon: 1163172.7780096494 deglat: 41.91610833333334
lat: 1909982.150384361

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