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

[John Mitchell]

Thanks Roger,

Since I sent out the email I was able to derive the EPSG code and the only
difference between mine and yours was that I had +units=m  and you had
+to_meter=0.3048006096012192.  I think that my EPSG code is correct since my
below email had the Linear Unit = Meter and +to_meter=0.3048006096012192
would mean the units was feet.

John

On Mon, Oct 6, 2008 at 1:01 PM, Roger André <randre at gmail.com> wrote:

> 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
>>
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>
>


-- 
John J. Mitchell
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