Hi,
I have a netCDF grid of Float32 values that I want to convert to GTiff
with Int16 values. The min/max values will support this without scaling,
but I'm not sure what will happen to the NODATA value =
9.96920996838686905e+36.
Ideally, I would like to set it to something like 32000 but not sure how
to do that.
I've gotten as far as:
gdal_translate -of GTiff -co TILED=YES -ot Int16 -a_srs EPSG:4326
GEBCO_2019.nc gebco_2019.tif
Which runs and looks ok except NODATA is set the same and that value
clearly will not fit in an Int16. Now it is possible that the grid
doesn't actually have any nodata cells set and only has the value
defined but I'm not sure how to check if that is the case.
Any thoughts appreciated.
Thanks,
-Steve W
$ gdalinfo GEBCO_2019.nc -stats
Driver: netCDF/Network Common Data Format
Files: GEBCO_2019.nc
Size is 86400, 43200
Coordinate System is `'
Origin = (-180.000000000000000,90.000000000000000)
Pixel Size = (0.004166666666667,-0.004166666666667)
Metadata:
elevation#long_name=Elevation relative to sea level
elevation#sdn_parameter_name=Sea floor height (above mean sea level)
{bathymetric height}
elevation#sdn_parameter_urn=SDN:P01::ALATZZ01
elevation#sdn_uom_name=Metres
elevation#sdn_uom_urn=SDN:P06::ULAA
elevation#standard_name=height_above_reference_ellipsoid
elevation#units=m
lat#axis=Y
lat#long_name=latitude
lat#sdn_parameter_name=Latitude north
lat#sdn_parameter_urn=SDN:P01::ALATZZ01
lat#sdn_uom_name=Degrees north
lat#sdn_uom_urn=SDN:P06::DEGN
lat#standard_name=latitude
lat#units=degrees_north
lon#axis=X
lon#long_name=longitude
lon#sdn_parameter_name=Longitude east
lon#sdn_parameter_urn=SDN:P01::ALONZZ01
lon#sdn_uom_name=Degrees east
lon#sdn_uom_urn=SDN:P06::DEGE
lon#standard_name=longitude
lon#units=degrees_east
NC_GLOBAL#comment=The data in the GEBCO_2019 Grid should not be used
for navigation or any purpose relating to safety at sea.
NC_GLOBAL#Conventions=CF-1.6
NC_GLOBAL#history=Information on the development of the data set and
the source data sets included in the grid can be found in the data set
documentation available from https://www.gebco.net
NC_GLOBAL#institution=On behalf of the General Bathymetric Chart of
the Oceans (GEBCO), the data are held at the British Oceanographic Data
Centre (BODC).
NC_GLOBAL#node_offset=1
NC_GLOBAL#references=DOI: 10.5285/836f016a-33be-6ddc-e053-6c86abc0788e
NC_GLOBAL#source=The GEBCO_2019 Grid is the latest global bathymetric
product released by the General Bathymetric Chart of the Oceans (GEBCO)
and has been developed through the Nippon Foundation-GEBCO Seabed 2030
Project. This is a collaborative project between the Nippon Foundation
of Japan and GEBCO. The Seabed 2030 Project aims to bring together all
available bathymetric data to produce the definitive map of the world
ocean floor and make it available to all.
NC_GLOBAL#title=The GEBCO_2019 Grid - a continuous terrain model for
oceans and land at 15 arc-second intervals
Corner Coordinates:
Upper Left (-180.0000000, 90.0000000)
Lower Left (-180.0000000, -90.0000000)
Upper Right ( 180.0000000, 90.0000000)
Lower Right ( 180.0000000, -90.0000000)
Center ( 0.0000000, 0.0000000)
Band 1 Block=86400x1 Type=Float32, ColorInterp=Undefined
Minimum=-10880.588, Maximum=8613.156, Mean=-1895.032, StdDev=2656.923
NoData Value=9.96920996838686905e+36
Unit Type: m
Metadata:
long_name=Elevation relative to sea level
NETCDF_VARNAME=elevation
sdn_parameter_name=Sea floor height (above mean sea level)
{bathymetric height}
sdn_parameter_urn=SDN:P01::ALATZZ01
sdn_uom_name=Metres
sdn_uom_urn=SDN:P06::ULAA
standard_name=height_above_reference_ellipsoid
STATISTICS_MAXIMUM=8613.15625
STATISTICS_MEAN=-1895.0320141561
STATISTICS_MINIMUM=-10880.587890625
STATISTICS_STDDEV=2656.9226774517
units=m
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