[gdal-dev] Auto-clip collar for DRGs/DOQQs/BSBs

[Christopher Barker]

Klokan Petr Přidal wrote:
> I wonder if there is a script for image analyze and automatic clipping
> for the freely available USGS DRGs and NOAA BSBs map sheets...

I have no idea, but...

> Or are there some already pre-calculated masks/bounding boxes or
> polygons for the DRGs and BSBs popular sheets on the net?

I haven't looked closely, but from a quick glance, it looks like the 
GRPs in the NOAA bsb charts may define the bounding box of the charts -- 
  it's worth looking at.

If you're lucky, the color used for the collar may not be used in the 
charts anywhere but I haven't looked at that.

> It would be nice to present some stitched maps and remove the borders
> in the examples of rendering capabilities of GDAL2Tiles at
> http://examples.maptiler.org/.

well, these folks have done it -- I don't know how, or if they are 
willing to share what they did, but it's pretty nice:

http://demo.geogarage.com/noaa/

-Chris


-- 
Christopher Barker, Ph.D.
Oceanographer

Emergency Response Division
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Chris.Barker at noaa.gov