[Gdal-dev] Re: GDAL and Spot Vegetation

[Paul Kelly]

Hello Markus

gdal-dev-request at xserve.flids.com wrote:
> ------------------------------------------------------------------------
>
> Subject:
> Re: [Gdal-dev] Re: GDAL and Spot Vegetation
> From:
> Markus Neteler <neteler at itc.it>
> Date:
> Wed, 18 Aug 2004 21:08:10 +0200
> To:
> Frank Warmerdam <warmerdam at pobox.com>
>
> To:
> Frank Warmerdam <warmerdam at pobox.com>
> CC:
> GDAL-dev list <gdal-dev at remotesensing.org>
>
>
> On Wed, Aug 18, 2004 at 01:07:10PM -0400, Frank Warmerdam wrote:
>
>[...]
>>
>>Markus,
>>
>>Norman is right about Plate Caree.  It is also known as Equirectangular 
in
>>some circles.  The page I maintain about it is at:
>>
>>  http://www.remotesensing.org/geotiff/proj_list/equirectangular.html
>
>
> No doubts (I was aware of both the name - looking into the Evenden docs
> as well as the url).
> But I wasn't aware of 'testepsg' - thanks for the hint. Exactly what
> I was looking for.

Just a little advertisement: the 'g.proj' module in GRASS 5.7 can also do 
this---and it is compiled by default. I tried:

GRASS 5.7.cvs > g.proj -w proj4='+proj=eqc +datum=wgs84'
A datum name wgs84 (WGS_1984) was specified without transformation 
parameters.
Note that the GRASS default for wgs84 is towgs84=0.000,0.000,0.000.
PROJCS["Equidistant Cylindrical (Plate Caree)",
     GEOGCS["wgs84",
         DATUM["WGS_1984",
             SPHEROID["wgs84",6378137,298.257223563]],
         PRIMEM["Greenwich",0],
         UNIT["degree",0.0174532925199433]],
     PROJECTION["Equirectangular"],
     PARAMETER["latitude_of_origin",0],
     PARAMETER["central_meridian",0],
     PARAMETER["false_easting",0],
     PARAMETER["false_northing",0]]

Paul

>
>
>>The "testepsg" program from gdal/ogr says:
>>
>>warmerda at gdal2200[25]% testepsg '+proj=eqc +lat_ts=0 +lon_0=0 +x_0=0 
+y_0=0'
>>...
>>PROJCS["unnamed",
>>    GEOGCS["WGS 84",
>>        DATUM["D_unknown",
>>            SPHEROID["WGS84",6378137,298.257223563]],
>>        PRIMEM["Greenwich",0],
>>        UNIT["Degree",0.017453292519943295]],
>>    PROJECTION["Equidistant_Cylindrical"],
>>    PARAMETER["latitude_of_origin",0],
>>    PARAMETER["central_meridian",0],
>>    PARAMETER["false_easting",0],
>>    PARAMETER["false_northing",0]]
>>...
>
>
> [for other users a note:
>    cd ogr/ ; make testepsg
> compiles it
> ]
>