[Gdal-dev] tif + .tfw + Proj4 projection information => FullyReferenced GeoTiff

[Brent Fraser]

Rich,

  If you have all projection parameters of your input data, you can specify
them on the gdalwarp command line using the -s_srs option (see
http://www.gdal.org/gdal_utilities.html#gdalwarp):

gdalwarp -s_srs "+proj=merc +lon_0=-70.316667 +lat_ts=41.65 +x_0=0 +y_0=0
ellps=GRS80" -t_srs "EPSG:4326" -of GTiff in.tif out.tif

Have a look at
http://www.remotesensing.org/geotiff/proj_list/mercator_1sp.html for more
projection information, as I'm not sure if your standard parallel has the
same meaning as the Proj "latitude of true scale".

Brent Fraser

----- Original Message ----- 
From: "Rich Signell" <rsignell at usgs.gov>
To: "gdal-dev" <gdal-dev at remotesensing.org>
Sent: Wednesday, May 18, 2005 1:27 PM
Subject: [Gdal-dev] tif + .tfw + Proj4 projection information =>
FullyReferenced GeoTiff


> I'm hoping someone will take pity on a newbie here.
>
> I've got a bunch of .tif images, corresponding .twf files, and I've also
been
> told that all the .tifs are in meters, Mercator w/ standard parallel of
41.65
> and a central meridian of -70.316667, NAD83 datum.
>
> I'd like to convert these to EPSG:4326, which would be easy to do using
> gdalwarp, except that I need a fully georeferenced geotiff as input,
right?
>
> So then I need a tool to add the georeferencing info.
>
> I tried using OpenEV, but it looks like it also wants a properly
georeferenced
> file to begin with.
>
> It looks like I could also use "geotifcp", but it seems that I would need
to
> find a properly reference geotiff first in my projection so that I could
use
> "listgeo" to understand the input projection text file format.
>
> After this, I had a sneaking suspicion that I was overlooking something.
There
> is an easy way, right?
>
> Thanks,
> Rich
>
> -- 
> Richard P. Signell
> U.S. Geological Survey       Phone: (508) 457-2229
> 384 Woods Hole Road          Fax:   (508) 457-2310
> Woods Hole, MA  02543-1598
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