Hello, Have you found workaround for this? I just created index bounding boxes for all the NOAA BSB charts using GDAL for my Android solution, see http://imgur.com/MpADB - as you can see there are quite many wrong locations, Xmin-coordinate is 0. In the same time, Y and Xmax seems to be correct, which is interesting also. I do not have the number, but there seems to be significant number (1/4?) of the NOAA files positioned wrong. Also QGIS seems to relay on this info and also offplaces same files.
Jaak 2012/11/10 Chris Barker <chris.bar...@noaa.gov> > On Fri, Nov 9, 2012 at 2:48 PM, Even Rouault > <even.roua...@mines-paris.org> wrote: > > > ok, I see what happens. In _3 and _4 cases, the BSB driver manages to > compute > > a geotransform from the GCPs and then assigns a projection, in addition > to the > > GCP projection. > > In the _1 and _2 cases, the BSB driver doesn't manage to compute the > > geotranform from the GCPs (which is a known issue sometimes with this > driver, > > presumably because it has a too strict tolerance in the computation of > the > > geotransform from the GCPs), so the projection is only reported by the > > GetGCPProjection() method, which the gdalsrsinfo never queries. > > > > In all cases, gdalinfo does show the projection and/or GCP projection. > > > > Perhaps gdalsrsinfo should also query the GCP projection if no regular > > projection is reported. > > I've wondered for ages about this driver -- the *.kap files have > redundant info -- the projection definition and related info is enough > (always? or only north-up?) to provide a complete projection and > geotransform, but there are also the set of GCPs. > > I've never checked to see if they always match to a good tolerance, > and I don't know what GDAL does with the redundant info. > > From your note, it sounds like GDAL prefers the GCP transform -- is > that so? and I'm not sure that's the best option -- presumably the > info in the header is exact? Why not prefer that? > > -Chris > > > > > -- > > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R (206) 526-6959 voice > 7600 Sand Point Way NE (206) 526-6329 fax > Seattle, WA 98115 (206) 526-6317 main reception > > chris.bar...@noaa.gov > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Jaak Laineste
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