[gdal-dev] What is the format of a .prf file?

[Stephen Woodbridge]

On 3/21/2013 4:08 AM, Rainer M Krug wrote:
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> On 20/03/13 16:44, Andre Joost wrote:
>> Am 20.03.2013 16:01, schrieb Rainer M Krug:
>>
>>> What I don't like is that I have to specify t_srs in such a long way. It states that t_srs
>>> can be "a .prf file containing well known text", but I can't figure out what a .pdf file is.
>>> Would for exmple work, if I put
>>>
>>> +proj=aea +lat_1=-28.25 +lat_2=-29.75 +lat_0=-29 +lon_0=30.75 +x_0=0 +y_0=0 +datum=WGS84
>>> +units=m +no_defs
>>>
>>> in t.prf and refer to it in gdalward as "-t_sts t.prf"?
>>>
>>
>> No, the proj definition text is not "well known text" WKT.
>>
>>
>>> Are there any examples available for prf files and allowed formats?
>>
>> It's simply the same format as in every shapefiles .prj file.
>>
>> For example ogr2ogr -s_srs epsg:3375 -t_srs epsg:4245 Malay-Kertau.shp rivers-neu.shp ogr2ogr
>> -s_srs epsg:3375 -t_srs Malay-Kertau.prj Malay-prj.shp rivers-neu.shp
>>
>> returns two identical outputs, where Malay-Kertau.prj contains the definition used in the first
>> run with EPSG:4245.
>
> Thanks for the response.
>
> So the file Malay-Kertau.prj would then contain the text:
>
> epsg:4245
>
> ?

No you would need something like:

GEOGCS["GCS_Kertau",DATUM["D_Kertau",SPHEROID["Everest_1830_Modified",6377304.063,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]

I found this here:
http://webhelp.esri.com/arcims/9.3/general/mergedprojects/ArcXMLGuide/elements/gcs.htm

webhelp.esri.com/arcims/9.3/general/mergedprojects/wms_connect/wms_admin/srs_list.htm

WKT for projections refers to ESRI projection info NOT proj4 epsg codes.

Read this:

http://www.nceas.ucsb.edu/scicomp/recipes/projections

-Steve W



> So I have to put into the file simply the text as supplied to -t_srs ?
>
> And what is the difference between a .prj file used by shape files and a .pdf file (format wise)?
>
> Rainer
>
>
> Rainer
>
>>
>> Greetings, André Joost
>>
>>
>>
>> _______________________________________________ gdal-dev mailing list gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
>
> - --
> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys.
> (Germany)
>
> Centre of Excellence for Invasion Biology
> Stellenbosch University
> South Africa
>
> Tel :       +33 - (0)9 53 10 27 44
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> email:      Rainer at krugs.de
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