[Gdal-dev] Adding Projection to ECW files ?
bill at BINKO.NET
Mon Jun 20 13:09:06 EDT 2005
On Mon, 20 Jun 2005, Frank Warmerdam wrote:
> On 6/19/05, Bill Binko <bill at binko.net> wrote:
> > Hi everyone: I hope everyone enjoyed the conference. If anyone has time
> > to look at this, I'd really appreciate it. I really would like to be busy
> > making summary layers, but am stuck at this point.
> Sorry for the delay in responding. As always there are various
> ways of approaching this. Ideally at the point you were
> generating the ECW file you would have set the coordinate system.
> Something like this (assuming WGS84):
> gdal_translate -of ECW -a_srs '+proj=utm +zone=17 +datum=WGS84' in.tif out.ecw
I knew you were busy with the conference: this is important to me, but not
critical. Unfortunately, I got the ECWs rather than the TIFFs, so I can't
re-compress them. I considered using gdal_translate from ECW to ECW, but
was worried that I might lose fidelity.
> Assuming you don't want to regenerate the ECWs you should be able to push
> the georeferencing into the PAM file (.aux.xml) with a small python script.
Is that PAM file documented anywhere? I can write a script to edit XML if
I know what I'm writing to.
> I had intended to provide an example of this, but find that I have another bug
> to pursue before I can complete this, but I had better send this email before
> I reboot.
Understood: I appreciate any help you can give.
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