Hi all,
I have a tiff image that has been exported from meteorological software
that has know geographic parameters:
ELLIPSOID_EQUATOR_RADIUS 6378206.5
ELLIPSOID_POLAR_RADIUS 6356584
ELLIPSOID_FLATTENING 0.00339
UPPER_LEFT_X -3507992.25
UPPER_LEFT_Y 6780696
LOWER_RIGHT_X 3601343.75
LOWER_RIGHT_Y 2337361
PROJECTION_TYPE Mercator
CENTER_LONGITUDE_MERCATOR_SPECIFIC -96
CENTER_LATITUDE 37.910004
CENTER_LONGITUDE -95.580002
ROTATION 0
I am trying to convert this to a geotiff with my eventual goal of
converting it to an unprojected tiff.
First step is to add the geographic information to the tiff:
gdal_translate -a_ullr -3507992.25 6780696 3601343.75 2337361-a_srs
"+proj=merc +lon_0=96w +a=6378206.5 +f=0.00339" src_image.tiff
dest_image.tiff
The failure I get is:
Failed to process SRS definition: +proj=merc +lon_0=96w +a=6378206.5
+f=0.00339
My second attempt was the try the same above command except with a proj
string that does not include the +a or +f options
But instead "+proj=merc +lon_0=96w +datum=WGS84". This did work.
The problem I am now having is that I bring this image into ArcInfo and
for some reason it is shifted north. I think that being able to
correctly apply the ellipsoid equator radius and ellipsoid flattening
may fix my problem or am I missing something?
The second step is to create an un-projected image from this data:
My presumption is the below command will accomplish
Just that:
gdalwarp -t_srs '+proj=latlong' -r ${sample_method} ${tmp_image_3}
${final_image
Any help is fully appreciated.
Thanks,
Bill
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