OK – well if the geoserver mosaic function is not supposed to deal with random NITF files and re-warping images – how come if I convert them first to geotif (without warping the imagery) the mosaicing tool accepts them and produces a (approximate) rectified mosaic? I’m sure this thing is designed to do what I want, but it just does not accept NITF files.
I notice that gdalinfo does not populate the geo-corners with the information from the IGEOLO but instead simply loads the image extent in pixel space, despite correctly populating the GCPs with lat/longs. gdalinfo is clearly showing the projection to be WGS84 EPSG:4326, it knows where the corners are in lat long space, so why is this information not used by GDAL to populate the image corners used by geoserver?
(incidentally, “gdal_translate –of GTiff my.ntf aNew.tif” does not produce a valid georeferenced geotif. I had to go first convert to geo-pdf and then to geotif for some reason)
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On Tue, Sep 22, 2015 at 7:16 PM, Smart, Gary Export License Required - US UTAS <Gary.Smart@…7257…> wrote:
I don’t think I have ever seen a NITF output from GDAL which reports anything on the line ‘Coordinate System is:’ – I was under the impression that the wealth of information below described the Coordinate System.
I was also under the impression that geoserver could import random NITF images (these are large NADIR views) and serve them through the WMS (i.e. presumably using GDAL to orthorectify the imagery en-route). To do this, I thought it used the four corner georeferencing clearly contained in this NITF file and all the others I have.
Is this not the case? I can see the images using the ‘layer preview’ tool, so I presume it can serve them somehow – and they look warped as required. But they just seem to be in the wrong place on the Earth!
Ha ha, you certainly made a large number of assumptions there :-p
No, GeoServer does does not do any ortorectification on the fly, gdal or not.
As Daniele suggested, you should fix those files using gdalwarp, so that they are truly rectified.
Or, if you really want GeoServer to follow the path you imagined, you can either add features to it yourself, the code is there for everybody, or check commercial support (http://geoserver.org/support/) to have someone do it for you
Cheers
Andrea
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