[Gdal-dev] gdalwarp

[Norman Barker]

Hi,

thanks for the reply I have run gdalwarp on some geotiffs and it is
successful, and on others it fails or returns a black image (with a sample
landsat image).

Also I have noticed the output of gdalwarp has to be viewed with a proper
geotiff reader such as Erdas ViewFinder rather than the default tiff readers
that come with Windows XP?

My question is what do you refer to as a 'properly labelled' geotiff?  Is
there any more documentation of gdalwarp that I could read, as I said before
I am a bit new to this, but am very interested!

Many thanks,

Norman

----- Original Message -----
From: "Frank Warmerdam" <warmerdam at pobox.com>
To: <gdal-dev at remotesensing.org>
Sent: Wednesday, May 12, 2004 8:35 PM
Subject: Re: [Gdal-dev] gdalwarp


> Norman Barker wrote:
> > Hi,
> >
> > looking at the warp utility am I correct in thinking that the
> > restriction on 8 bit tiff, and holding all the tiff in memory is now
> > removed.
> >
> > GDAL 1.1.8
> > 'implemented new 'gdalwarp' application for projection and GCP based
image
> >    warping.  See gdal/alg for underlying algorithms.  Currently gdalwarp
> > only
> >    supports 8 bit images and holds the whole source image in memory.'
>
> Norman,
>
> Yes, I believe the new generalized warper was in place for the 1.1.9
release
> and certainly for 1.2.0.
>
> > As I am a bit new to this, and in particular GDAL say I had a geotiff in
> > in UTM WGS84 (EPSG:32630)  how would I convert it to Lat/long WGS84
> > (EPSG:4326) ?
>
> Assuming the input file is properly labelled as UTM you would just do:
>
>    gdalwarp -t_srs EPSG:4326 in.tif out.tif.
>
> Best regards,
>
> ---------------------------------------+----------------------------------
----
> I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
>
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