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Even Rouault kirjoitti 24.10.2017 klo 13:28:<br>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> The netcdf files I looked at through the GDAL driver had time and/or</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> depth offered as different gdal layers, and offered different variables</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> (i.e. different coverages) as subdatasets.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Yes, although in the WCS case, a coverage can have several bands, and thus using the band mechanism to reflect the N>2 dimensions can become confusing.</p>
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Also in NetCDF the time dimension may be as bands - at least I have
marine research data which opens first as having two subdatasets
(mean and max wave height) and then as bands (the monthly values).<br>
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<blockquote type="cite" cite="mid:1937599.9sUUdu34an@even-i700">
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">The only clean solution to that would be to have a true multidimensional raster support at the GDAL API level, but that's a rather involved effort.</p>
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Above the division to subdatasets and bands seems arbitrary and
perhaps not user controllable. I agree it would be useful to have a
better data model in this respect.<br>
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Ari<br>
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<blockquote type="cite" cite="mid:1937599.9sUUdu34an@even-i700">
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> Which other GDAL drivers give direct access to time-varying raster</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">> stacks in single files?</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I guess HDF5, as it is really close to netCDF.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">GRIB could potentially be used to have time-varying raster, although, from what I saw, generally you put instead different variables for the same forecast time in the same file. But technically you couldx just concatenate any amount of GRIB messages into a single file and this will be seen as a multi-band raster by GDAL.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Even</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">-- </p>
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