...and would be so nice having a GUI in QGIS for gdal_rasterize and the
rest of
gdal utilities!
Agus
Jamie Adams wrote:
You could create a polygon in qgis (or some automated way), find an
unused pixel value in the chart, and then use gdal_rasterize -i to
burn it into the collar area. You can then use that as the
transparency value.
On Wed, Mar 18, 2009 at 3:32 PM, Chris h <chris...@magma.ca
<mailto:chris...@magma.ca>> wrote:
On Wednesday 18 March 2009 16:07:18 MS wrote:
> I realize this goes into other software on a qgis list, but I wonder
> with GDAL or GRASS one can accomplish this.
>
> It is really a raster clip that would work well, especially if the
> next step is mosaic'ing the rasters. Are these quad ma
The charts are NOAA BSB rasters.
Posted the same questions to the grass list and the response was
positive:
------------------------------------------------
>> WIth r.in.poly you could "digitize" the area of interest, then use
>> r.mask to remove the outside area, then r.patch everything.
>> With a small script you could generate the ASCII polygon file
>> for r.in.poly based on the map extent.
--------------------------------------------------
Standalone gdal will not do it, especially if you want to automate
the process
and have concerns with the osmerander bug which in a marine charting
environment could be rather interesting. The charts will in fact
be tiled and
made available via mapserver wms.
The only issue for me is that I must learn each step with each
application.
Hence I went the easy route first to see what can be done with qgis.
There is a very good new program out for creating tiles,
maptiler.org <http://maptiler.org> and need
to see and learn if the datum and projection can be changed. Its
basically a
front end to galtiler.
Thanks for all the suggestions.
--
/ch
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