[gdal-dev] GCTP projection -s_srs=???

[Frank Warmerdam]

Nikos,

I see that GCTP Projection 97 is Cylindrical Equal Area.  This can
have a standard parallel and a central meridian (from
http://www.remotesensing.org/geotiff/proj_list/cylindrical_equal_area.html).
 Without knowing what these are it is hard to do much, but you might
try it assuming they are zero and zero in which case you would use
something like:

-s_srs "+proj=cea +datum=WGS84"

If you examine the HDF metadata more carefully you might find more
information.  Initially see what metadata makes it through GDAL with
gdalinfo.  If that doesn't show anything, perhaps try low level HDF
tools.

If you make the datasource available, and filed a bug it might be
possible for us to fix ogr_srs_usgs.cpp to handle CEA.  In the
comments I see:

        // FIXME: CEA --- Cylindrical Equal Area skipped (Grid corners
set in meters for EASE grid)

Best regards,
Frank


On Wed, Jan 23, 2013 at 10:20 AM, Nikolaos Hatzopoulos
<nhatzop at gmail.com> wrote:
> I have this projection for my nasa hdf file:
>
> Coordinate System is:
> LOCAL_CS["GCTP projection number 97",
>     UNIT["Meter",1]]
> Origin = (-17334194.000000000000000,7344784.825000000186265)
> Pixel Size = (25067.525334417932754,-25067.525298634809587)
>
>
> I tried to reporject my image using gdalwrap and I got:
>
> ERROR 1: No PROJ.4 translation for source SRS, coordinate
> transformation initialization has failed.
>
> I am reading this:
> http://www.gdal.org/ogr/classOGRSpatialReference.html#a04ab13a2ec4ceffd6f802422f95e8f15
>
> from the array I understand:
>
> 9 Transverse Mercator
> 7 FN
>
>
>
> how I have to define my -s_srs=?????
>
> --Nikos Hatzopoulos
>
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