Even, Piero, thank you very much for your detailed answers !
Adrien Le 30/06/2015 08:41, Piero Campalani a écrit :
Adrien, OGC in its GML standard document -- of course in line with ISO -- recommends that:/ "When a grid point is used to represent a sample space (e.g. image pixel), the grid point represents the center of the sample space (see ISO 19123:2005, 8.2.2)"/. GML encodes the locations of a raster/gridded-coverage by means of a grid of 0D points. You can always put your raster origin wherever you want, i.e. in whatever corner you prefer. Alas, there's no way -- that I am aware of -- to specify what is the shape of a measurement footprint/sample-space, nor to say if the footprint surrounds the point-geometry equally (point is pixel-centre) or some other way (point is pixel-upper-left-corner?). Hence raster creators should probably stick to this recommended encoding until standards do not offer more freedom on this :) @seeAlso http://rasdaman.org/wiki/PetascopeSubsets http://rasdaman.org/ticket/680 - Piero ! On 29 June 2015 at 21:00, <[email protected] <mailto:[email protected]>> wrote: Date: Mon, 29 Jun 2015 11:12:11 +0200 From: Adrien ANDR? <[email protected] <mailto:[email protected]>> To: [email protected] <mailto:[email protected]> Subject: [gdal-dev] Raster origin coodinates in file header Message-ID: <[email protected] <mailto:[email protected]>> Content-Type: text/plain; charset=utf-8; format=flowed Dear list, opening 2 rasters with different resolutions i noticed a shift. Asking our imagery provider, i was told the origin coordinates they store in image header (JP2 files) are those of the top left pixel center. GDAL reads origin coordinates as the top left pixel top left corner coordinates, as i'm used to. Of course, i fixed my problem, the hacky way, playing with gdal_translate a_ullr option, but: How to deal with this? How not to worry about georeferencing each time i load a raster file? Is there any OGC recommendation about origin coordinates storage? Thanking you in advance, Regards, Adrien _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
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