All,
I am trying to view a netcdf file in grass via gdal. The netcdf data is
on a projected grid so the latitudes and longitudes are are unique at
each point (i.e. 2D coordinate variables).
gdal doesnt seem to understand the georeferencing information whn I try
to follow the CF-1.0 specs on multi-dimensional coordinate variables,
http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.0/cf-conventions.html#id2888361
Below is the header info from ncdump and the resulting info coming from
gdalinfo. Can you use multi-dimensional coordinate variables in
conjunction with gdal?
If so, can you advise what I need to do to make my netcdf file work with
gdal?
Thank you,
Aaron
*NCDUMP output:*
>>>>> ncdump -h conc_20081208071500.nc
netcdf conc_20081208071500 {
dimensions:
Time = UNLIMITED ; // (1 currently)
DateStrLen = 14 ;
xc = 299 ;
yr = 301 ;
nspecies = 1 ;
nageclass = 1 ;
variables:
char Times(Time, DateStrLen) ;
Times:long_name = "time" ;
Times:units = "minutes since Wed Apr 8 15:49:19 2009" ;
float wet(Time, nageclass, nspecies, yr, xc) ;
wet:long_name = "WET DEPOSITION" ;
wet:units = "ppm" ;
wet:coordinates = "lon lat" ;
float dry(Time, nageclass, nspecies, yr, xc) ;
dry:long_name = "DRY DEPOSITION" ;
dry:units = "ppm" ;
dry:coordinates = "lon lat" ;
float xc(xc) ;
xc:long_name = "x-coordinate in Cartesian system" ;
xc:units = "m" ;
float yr(yr) ;
yr:long_name = "y-coordinate in Cartesian system" ;
yr:units = "m" ;
float nspecies(nspecies) ;
nspecies:long_name = "number of species" ;
nspecies:standard_name = "number_of_species" ;
float nageclass(nageclass) ;
nageclass:long_name = "number of age classes" ;
nageclass:standard_name = "number_of_ageclasses" ;
float lat(yr, xc) ;
lat:long_name = "latitude" ;
lat:units = "degrees_north" ;
float lon(yr, xc) ;
lon:long_name = "longitude" ;
lon:units = "degrees_east" ;
*GDALINFO output:*
>>>>gdalinfo NETCDF:"conc_20081208071500.nc":dry
Driver: netCDF/Network Common Data Format
Files: none associated
Size is 299, 301
Coordinate System is `'
Origin = (0.500000000000000,301.500000000000000)
Pixel Size = (1.000000000000000,-1.000000000000000)
Metadata:
NC_GLOBAL#title=FLEXPART Concentration Grids
NC_GLOBAL#institution=State Climate Office of NC
NC_GLOBAL#history=Created on Wed Apr 8 15:49:19 2009
NC_GLOBAL#reference=http://www.nc-climate.ncsu.edu
NC_GLOBAL#Conventions=CF-1.0
dry#long_name=DRY DEPOSITION
dry#units=C
dry#coordinates=lon lat
xc#long_name=x-coordinate in Cartesian system
xc#units=m
yr#long_name=y-coordinate in Cartesian system
yr#units=m
nspecies#long_name=number of species
nspecies#standard_name=number_of_species
nageclass#long_name=number of age classes
nageclass#standard_name=number_of_ageclasses
Corner Coordinates:
Upper Left ( 0.500, 301.500)
Lower Left ( 0.5000000, 0.5000000)
Upper Right ( 299.500, 301.500)
Lower Right ( 299.500, 0.500)
Center ( 150.000, 151.000)
Band 1 Block=299x1 Type=Float32, ColorInterp=Undefined
NoData Value=9.96920996838686905e+36
Metadata:
NETCDF_VARNAME=dry
NETCDF_DIMENSION_Time=1
NETCDF_DIMENSION_nageclass=1.000000
NETCDF_DIMENSION_nspecies=1.000000
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