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, <gdal-dev-requ...@lists.osgeo.org> wrote: > Date: Mon, 29 Jun 2015 11:12:11 +0200 > From: Adrien ANDR? <adr.an...@laposte.net> > To: gdal-dev@lists.osgeo.org > Subject: [gdal-dev] Raster origin coodinates in file header > Message-ID: <55910beb.2030...@laposte.net> > 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 >
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