[mapserver-users] Re: [gdal-dev] creating an epsg code that can be used within the epsg file for fwtools and MapServer

[Roger André]

Hi John,

No guarantees that I got this right, but you could try adding the following
entry to your "FWTools/share/proj/epsg" file:

# Guatemala Transverse Mercator
<001234> +proj=tmerc +x_0=500000.000000 +y_0=0 +lon_0=-90.5 +lat_0=0
+k=0.999800 +ellps=WGS84 +datum=WGS84 +to_meter=0.3048006096012192 +no_defs
<>

Then you should be able to acces it by using "EPSG:001234" in your -s_srs
parameters.

Roger
--

On Mon, Oct 6, 2008 at 7:10 AM, John Mitchell <mitchelljj98 at gmail.com>wrote:

> Hi,
>
> How would I create an epsg code that can be used within the epsg file for
> fwtools and MapServer?
>
> Below is the information that I would like to use to create an epsg code.
> What would be format for the new epsg code?  Is the information listed below
> enough to create an epsg code and if not what am I missing?
>
>
> *The 2001 data was originally in a Guatemalan Transverse Mercator
> coordinate
> system with the parameters shown below:
>
> Projection: Transverse Mercator
> False Easting: 500000.000000
> False Northing: 0.000000
> Central Meridian: -90.500000
> Scale Factor: 0.999800
> Latitude of Origin: 0.0000000
> Linear Unit: Meter
> Geographic Coordinate System: GCS_WGS_1984
>
> *Below is the gdalinfo listing for one of files that I would like to
> associate to this new epsg code:
>
> *Driver: GTiff/GeoTIFF
> Size is 11214, 7860
> Coordinate System is `'
> Origin = (317049.000000000000000,**1659460.000000000000000)
> Pixel Size = (0.500000000000000,-0.**500000000000000)
> Metadata:
>   AREA_OR_POINT=Area
>   TIFFTAG_SOFTWARE=ERDAS IMAGINE
>   TIFFTAG_XRESOLUTION=1
>   TIFFTAG_YRESOLUTION=1
>   TIFFTAG_RESOLUTIONUNIT=1 (unitless)
> Corner Coordinates:
> Upper Left  (  317049.000, 1659460.000)
> Lower Left  (  317049.000, 1655530.000)
> Upper Right (  322656.000, 1659460.000)
> Lower Right (  322656.000, 1655530.000)
> Center      (  319852.500, 1657495.000)
> Band 1 Block=11214x8 Type=Byte, ColorInterp=Red
> Band 2 Block=11214x8 Type=Byte, ColorInterp=Green
> Band 3 Block=11214x8 Type=Byte, ColorInterp=Blue*
>
>
>
> Thanks,
>
> --
> John J. Mitchell
>
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> gdal-dev at lists.osgeo.org
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>
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