[gdal-dev] Writing multi-bands vs multi-datasets

[Joaquim Manuel Freire Luís]

Hi,

I have a Julia version of gdal_translate (that ends up calling GDALDatasetRasterIOEx) that works in saving a MxNxP array, but not the way I wanted.
It creates a multi-subdatasets file, whilst what I wished is to write a multi-band file.

For example, the file written with this Julia function looks like below

How can I write a multi-band instead of a multi-datasets?
I've been looking at the docs of GDALDatasetRasterIOEx but can't see any way of picking one or the other.

Joaquim

gdalinfo cube_rad.nc
Driver: netCDF/Network Common Data Format
Files: cube_rad.nc
Size is 512, 512
Metadata:
  NC_GLOBAL#Conventions=CF-1.5
  NC_GLOBAL#GDAL=GDAL 3.4.0dev, released 2021/99/99
  NC_GLOBAL#history=Sun Oct 10 13:01:06 2021: GDAL CreateCopy( cube_rad.nc, ... )
Subdatasets:
  SUBDATASET_1_NAME=NETCDF:"cube_rad.nc":Band1
  SUBDATASET_1_DESC=[1567x1519] Band1 (32-bit floating-point)
  SUBDATASET_2_NAME=NETCDF:"cube_rad.nc":Band2
  SUBDATASET_2_DESC=[1567x1519] Band2 (32-bit floating-point)
...

Saving the same data (or similar) from a Matlab code that I wrote long ago to stack grids, shows

gdalinfo evi_cube.nc
Driver: netCDF/Network Common Data Format
Files: evi_cube.nc
Size is 37, 59
Origin = (580140.000000000000000,4418550.000000000000000)
Pixel Size = (30.000000000000000,-30.000000000000000)
Metadata:
...
  latitude#actual_range={4416795,4418535}
  latitude#long_name=latitude
  latitude#units=degrees_north
  longitude#actual_range={580155,581235}
  longitude#long_name=longitude
  longitude#units=degrees_east
  NC_GLOBAL#Conventions=COARDS
  NC_GLOBAL#description=File written from Matlab
  NC_GLOBAL#node_offset=0
  NC_GLOBAL#Source_Software=Mirone
  NC_GLOBAL#title=Grid created by Mirone
  NETCDF_DIM_EXTRA={time}
  NETCDF_DIM_time_DEF={67,6}
  NETCDF_DIM_time_VALUES={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67}
  z#actual_range={-856.4703369140625,176.8457641601562}
  z#long_name=z
  z#units=unknown
  z#_FillValue=-nan(ind)
Corner Coordinates:
Upper Left  (  580140.000, 4418550.000)
Lower Left  (  580140.000, 4416780.000)
Upper Right (  581250.000, 4418550.000)
Lower Right (  581250.000, 4416780.000)
Center      (  580695.000, 4417665.000)
Band 1 Block=37x59 Type=Float32, ColorInterp=Undefined
  NoData Value=nan
  Unit Type: unknown
  Metadata:
    actual_range={-856.4703369140625,176.8457641601562}
    long_name=z
    NETCDF_DIM_time=1
    NETCDF_VARNAME=z
    units=unknown
    _FillValue=-nan(ind)
Band 2 Block=37x59 Type=Float32, ColorInterp=Undefined
  NoData Value=nan
  Unit Type: unknown
  Metadata:
    actual_range={-856.4703369140625,176.8457641601562}
    long_name=z
    NETCDF_DIM_time=2
    NETCDF_VARNAME=z
    units=unknown
    _FillValue=-nan(ind)
...
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