Re: [udig-users] CRS-less Geotiff hint

["andrea antonello" <andrea.antonello@xxxxxxxxx>]

Hi Jesse,
great summary, thanks, these are important to know!

At Bolsena I talked to Simone and he has some tools that he would like
to have in udig. I agreed to make some nice udig commands out of them.
The tools are about splitting up too large images in smaller ones and
also creating overviews for tiffs in order to have nice quick loading
at certain scales.

As things usually go, back from Bolsena lots of work was waiting for
me. But I would love to make those soon, as they will solve lots of
issues.
Simone, if you are listening, could you send me the link to the
repository holding those nice tools? Do they also create imagemosaic?

Ciao
Andrea




On Wed, Jun 25, 2008 at 10:22 AM, Jesse Eichar <jeichar.w@xxxxxxxxx> wrote:
> Hi all,
> I'm sure many of you know this.  But that's ok I'll send it out anyhow.
> If you have a problem importing a Geotiff and GDAL is ok with the Geotiff,
> it is probably because the Geotiff
> 1. To large
> 2. Does not have a CRS defined.
> For the too large solution I will provide a separate hint for the too large
> issue.
> First how do you tell the Geotiff has no CRS.  Using GDAL you can use the
> command:
>> gdalinfo my_geotiff.tif
> The result will have the line:
> Coordinate System is `'
> This means there is not CRS.  Suppose the correct CRS is EPSG:4326 (lat
> long).  Use the command:
>> gdalwarp -s_srs EPSG:4326 -t_srs EPSG:4326 my_geotiff.tif
>> referenced_geotiff.tif
> I'm not a gdal wizard so you may have to regenerate pyramids and so on but
> uDig 1.1 can use the referenced_geotiff.tif now.
> Another note is that uDig 1.1 loads the tif into memory so you have to
> allocate uDig enough memory and also you don't need to worry about overviews
> and pyramids.  uDig 1.2 will fix this problem.
> Jesse
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