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<p class="MsoNormal"><span lang="PT">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="PT"><o:p> </o:p></span></p>
<p class="MsoNormal">I am getting an error in GMT when trying to read the “qual_sst” subdataset of this nc file<o:p></o:p></p>
<p class="MsoNormal"><a href="https://fct-gmt.ualg.pt/gmt/data/cache/A2016152023000.L2_LAC_SST.nc">https://fct-gmt.ualg.pt/gmt/data/cache/A2016152023000.L2_LAC_SST.nc</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But it’s only that subdataset that errors.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">gdalinfo A2016152023000.L2_LAC_SST.nc<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal"> SUBDATASET_1_NAME=NETCDF:"A2016152023000.L2_LAC_SST.nc":/geophysical_data/sst<o:p></o:p></p>
<p class="MsoNormal"> SUBDATASET_1_DESC=[2030x1354] sea_surface_temperature (16-bit integer)<o:p></o:p></p>
<p class="MsoNormal"> SUBDATASET_2_NAME=NETCDF:"A2016152023000.L2_LAC_SST.nc":/geophysical_data/qual_sst<o:p></o:p></p>
<p class="MsoNormal"> SUBDATASET_2_DESC=[2030x1354] /geophysical_data/qual_sst (8-bit integer)
<o:p></o:p></p>
<p class="MsoNormal">…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For example, this works (and works for all other subdasets except “qual_sst”):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">gmt grd2xyz A2016152023000.L2_LAC_SST.nc=gd?NETCDF:"A2016152023000.L2_LAC_SST.nc":/geophysical_data/sst -ZTLf > lixo.b<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">but this fails with<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">ERROR 7: Assertion `false' failed in file `C:\progs_cygw\GMTdev\gmt5\master\src\gmt_gdalread.c', line 1402<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The code in question starts in<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://github.com/GenericMappingTools/gmt/blob/master/src/gmt_gdalread.c#L1246">https://github.com/GenericMappingTools/gmt/blob/master/src/gmt_gdalread.c#L1246</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">and debugging shows that GDALGetRasterDataType(hBand) is returning 14, which according to this page<o:p></o:p></p>
<p class="MsoNormal"><a href="https://gdal.org/api/raster_c_api.html#_CPPv412GDALDataType">https://gdal.org/api/raster_c_api.html#_CPPv412GDALDataType</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">indicates that the layer is interpreted to be <span class="pre">
GDT_CFloat64<o:p></o:p></span></p>
<p class="MsoNormal"><span class="pre"><o:p> </o:p></span></p>
<p class="MsoNormal"><span class="pre">I get the exact same error when loading that subdataset from my Julia wrapper, that inquires the gdal shared lib directly and does not use the code wrapped in GMT.<o:p></o:p></span></p>
<p class="MsoNormal"><span class="pre"><o:p> </o:p></span></p>
<p class="MsoNormal"><span class="pre">But GDAL itself does not have problems extracting the data. This works fine<o:p></o:p></span></p>
<p class="MsoNormal"><span class="pre"><o:p> </o:p></span></p>
<p class="MsoNormal"><span class="pre">gdal_translate NETCDF:"A2016152023000.L2_LAC_SST.nc":/geophysical_data/qual_sst qual_lixo.nc<o:p></o:p></span></p>
<p class="MsoNormal"><span class="pre"><o:p> </o:p></span></p>
<p class="MsoNormal"><span class="pre"><o:p> </o:p></span></p>
<p class="MsoNormal"><span class="pre">Joaquim</span><o:p></o:p></p>
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