Also asked here: http://gis.stackexchange.com/questions/170882/how-can-a-make-a-netcdf-with-subgroups-smaller
Is there an easy way to make a netcdf with subdatasets but shrink it without resorting to C or Fortan? I'm trying to write a test for code that works with hycom netcdf global ocean circulation data. The source file 2 subdatasets: gdalinfo hycom_glb_911_2015110200_t000_uv3z.nc | grep _NAME SUBDATASET_1_NAME=NETCDF:"hycom_glb_911_2015110200_t000_uv3z.nc":water_u SUBDATASET_2_NAME=NETCDF:"hycom_glb_911_2015110200_t000_uv3z.nc":water_v With 40 depth bands: gdalinfo NETCDF:hycom_glb_911_2015110200_t000_uv3z.nc:water_u | grep '^Band' | head -3 Band 1 Block=4500x1 Type=Int16, ColorInterp=Undefined Band 2 Block=4500x1 Type=Int16, ColorInterp=Undefined Band 3 Block=4500x1 Type=Int16, ColorInterp=Undefined I've got some code written the does things like calculate the speed in m/s from the UV and creates a geotiff, etc. The original files are much too large for using in unittests. Is there an easy way with gdal, nco or ? to keep the structure and metadata, but create a much smaller file? I'm open to dropping all but the first two bands and writing a constant value into each band + turning on deflate compression. Trying with GDAL: gdal_translate --version # At head -> r31584 GDAL 2.1.0dev, released 2015/99/99 gdal_translate hycom_glb_911_2015110200_t000_uv3z.nc hycom_glb_911_2015110200_t000_uv3z-try2.nc -of netcdf -co compress=deflate Input file contains subdatasets. Please, select one of them for reading. The originals are quite a bit large for tests: ls -lh hycom_glb_911_2015110200_t000_uv3z.nc -rw-r----- 1 schwehr group 1.4G Nov 19 09:13 hycom_glb_911_2015110200_t000_uv3z.nc Thanks, -kurt
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