[gdal-dev] Looking for gdal_merge workflow

[Even Rouault]

Le mercredi 16 septembre 2015 18:48:43, Carl Godkin a écrit :
> Thank you for the suggestion.  I never realized that gdalwarp was useful
> for more than coordinate system transformation!
> 
> Now I'm trying to figure out the right options for this since gdalwarp's
> manual page hardly mentions the mosaic operations.

Mosaicing is a bit dealt at :
http://download.osgeo.org/gdal/workshop/foss4ge2015/workshop_gdal.html#__RefHeading__5955_1333016408

> 
> Given my hi-res image with plenty of nodata and lo-res image without any
> nodata, can you suggest a command line that will choose the hi-res image
> where it's available and fill in the nodata regions with the lo-res image?
> I've played around some with gdalwarp but haven't achieved the result I am
> looking for yet.

gdalwarp in1.tif in2.tif out.tif should pick up the resolution of the hi-res 
image (not verified, but that's what the code suggests)

Anyway with the -tr switch, you can control the resolution.

> 
> Thanks again,
> 
> carl
> 
> 
> 
> On Wed, Sep 16, 2015 at 9:11 AM, Jean-Claude Repetto <jrepetto at free.fr>
> 
> wrote:
> > Le 16/09/2015 17:57, Carl Godkin a écrit :
> > > Can you suggest a workflow to get what I want?  Is there another tool
> > > for this I should use instead?
> > 
> > Hi,
> > 
> > You should consider using gdalwarp, which is a more powerful tool than
> > gdal_merge, that was written at the beginning to demonstrate how to use
> > the Python API.
> > 
> > Jean-Claude

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