[Gdal-dev] Adding Projection to ECW files ?

[Bill Binko]

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.

Thanks
Bill

On Wed, 15 Jun 2005, Bill Binko wrote:

> 
> Hi everyone,
> 
> First, enjoy the conference: this can wait, but I wanted to ask while it 
> was fresh.  Wish I could join you.
> 
> I have had some recent success with my raster project...
> 
> 1) I have gotten GDAL & ECW to work on Linux (bug in ECW) 
> 
> 2) I have gotten gdaltindex to generate a tileindex of my DOQQs 
> 
> 3) I have gotten Mapserver to show my images (YAY) if I set the projection
> to UTM Zone 17N in the mapfile
> 
> The problem is that the ECW files don't seem to have the UTM 17N
> associated with them in any metadata that GDAL reads.  They come with
> .aux, .ecw, .ecw.xml, .ecw.aux.xml, and .html files for each image.
> 
> Now, when I run gdalinfo on the file, I get this:
> 
> [bill at fastcat ecw_rgb]$ gdalinfo dq4517ne.ecw
> Driver: ECW/ERMapper Compressed Wavelets
> Size is 6199, 7064
> Coordinate System is:
> LOCAL_CS["LOCAL",
>     UNIT["Meter",1]]
> Origin = (397031.442000,3277747.800000)
> Pixel Size = (1.00000000,-1.00000000)
> Corner Coordinates:
> Upper Left  (  397031.442, 3277747.800)
> Lower Left  (  397031.442, 3270683.800)
> Upper Right (  403230.442, 3277747.800)
> Lower Right (  403230.442, 3270683.800)
> Center      (  400130.942, 3274215.800)
> Band 1 Block=6199x1 Type=Byte, ColorInterp=Red
>   Overviews: arbitrary
> Band 2 Block=6199x1 Type=Byte, ColorInterp=Green
>   Overviews: arbitrary
> Band 3 Block=6199x1 Type=Byte, ColorInterp=Blue
>   Overviews: arbitrary
> 
> So, I know that it has the boundary info, and I don't need separate .tfw 
> (or equivalent).  However, notice the LOCAL_CS -- it didn't find the 
> projection information.
> 
> Is there any way I can add this to the files?  It should be the same for 
> all of them.
> 
> Without it, gdal_merge.py blows up, and I can't create summary images :(
> 
> I know this is long winded, but can anyone help?
> 
> Thanks
> Bill
> 
> 
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