[Qgis-user] map collars

[Agustin Lobo]

...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 <chris123 at magma.ca 
> <mailto:chris123 at 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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