#3498 closed defect (fixed)

Can't open NetCDF file

Reported by: mankoff Owned by: grass-dev@…
Priority: normal Milestone: 7.4.2
Component: Default Version: 7.4.0
Keywords: Cc:
CPU: Unspecified Platform: MacOSX

Description

In GRASS 7.2.2 I can read a netCDF file:

r.in.gdal -o input=netCDF:${ROOT}/MOD6_2000.nc:gld band=1 output=tmp --o
WARNING: Over-riding projection check
Proceeding with import of 366 raster bands...
Importing raster map <tmp>...

In GRASS 7.4.0, I cannot:

r.in.gdal -o input=netCDF:${ROOT}/MOD6_2000.nc:gld band=1 output=tmp --o
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsProjected'.

ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsGeographic'.

Input contains an invalid SRS. WKT definition:
PROJCS[
WARNING: Unable to convert input map projection information to GRASS
         format.

Same file, same GRASS location.

Google finds 0 results for the string "Pointer 'hSRS' is NULL in 'OSRIsProjected'", so I'm not even sure what project (GRASS, proj, gdal) might be causing this problem. Sample file is attached.

Attachments (1)

foo.nc (13.6 KB) - added by mankoff 21 months ago.
sample file

Download all attachments as: .zip

Change History (8)

Changed 21 months ago by mankoff

Attachment: foo.nc added

sample file

comment:1 in reply to:  description Changed 21 months ago by hellik

Replying to mankoff:

In GRASS 7.2.2 I can read a netCDF file:

r.in.gdal -o input=netCDF:${ROOT}/MOD6_2000.nc:gld band=1 output=tmp --o
WARNING: Over-riding projection check
Proceeding with import of 366 raster bands...
Importing raster map <tmp>...

In GRASS 7.4.0, I cannot:

r.in.gdal -o input=netCDF:${ROOT}/MOD6_2000.nc:gld band=1 output=tmp --o
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsProjected'.

ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsGeographic'.

Input contains an invalid SRS. WKT definition:
PROJCS[
WARNING: Unable to convert input map projection information to GRASS
         format.

Same file, same GRASS location.

Google finds 0 results for the string "Pointer 'hSRS' is NULL in 'OSRIsProjected'", so I'm not even sure what project (GRASS, proj, gdal) might be causing this problem. Sample file is attached.

which EPSG/projection has this dataset?

gdalinfo says

  polar_stereographic#false_easting=0
  polar_stereographic#false_northing=0
  polar_stereographic#GeoTransform=-653000 4992.671009771987 0 -632500 0 -5003.636363636364 
  polar_stereographic#grid_mapping_name=polar_stereographic
  polar_stereographic#inverse_flattening=298.257223563
  polar_stereographic#latitude_of_projection_origin=90
  polar_stereographic#longitude_of_prime_meridian=0
  polar_stereographic#long_name=CRS definition
  polar_stereographic#semi_major_axis=6378137
  polar_stereographic#spatial_ref=PROJCS[
  polar_stereographic#standard_parallel=70
  polar_stereographic#straight_vertical_longitude_from_pole=-45

comment:2 Changed 21 months ago by mankoff

The data set was generated by exporting the (lon,lat) of each cell from a GRASS EPSG:3413 location and mapset to a NetCDF file, and then using the cdo remapbil function to convert a rotated-pole netCDF file to this grid.

g.region -p
projection: 99 (WGS 84 / NSIDC Sea Ice Polar Stereographic North)
zone:       0
datum:      wgs84
ellipsoid:  wgs84
north:      -630000
south:      -3385000
west:       -655000
east:       880000
nsres:      5000
ewres:      5000
rows:       551
cols:       307
cells:      169157

And

g.proj -j
+proj=stere
+lat_0=90
+lat_ts=70
+lon_0=-45
+k=1
+x_0=0
+y_0=0
+no_defs
+a=6378137
+rf=298.257223563
+towgs84=0.000,0.000,0.000
+to_meter=1

comment:3 Changed 21 months ago by mankoff

And the reason the projection is slightly different than your gdalinfo output is because since I posted the file I realized I need to set the -a flag to g.region so that the resolution is not rounded to a strange number. My gdalinfo output contains:

  polar_stereographic#false_easting=0
  polar_stereographic#false_northing=0
  polar_stereographic#GeoTransform=-655000 5000 0 -630000 0 -5000
  polar_stereographic#grid_mapping_name=polar_stereographic
  polar_stereographic#inverse_flattening=298.257223563
  polar_stereographic#latitude_of_projection_origin=90
  polar_stereographic#longitude_of_prime_meridian=0
  polar_stereographic#long_name=CRS definition
  polar_stereographic#semi_major_axis=6378137
  polar_stereographic#spatial_ref=PROJCS[
  polar_stereographic#standard_parallel=70
  polar_stereographic#straight_vertical_longitude_from_pole=-45

Note that regardless of this, I'm using the -o flag to r.in.gdal, and it works in grass 7.2.0. I thought the -o flag means the projection information, which may or may not be present and/or correct, is ignored.

comment:4 in reply to:  2 ; Changed 21 months ago by hellik

Replying to mankoff:

g.proj -j
+proj=stere
+lat_0=90
+lat_ts=70
+lon_0=-45
+k=1
+x_0=0
+y_0=0
+no_defs
+a=6378137
+rf=298.257223563
+towgs84=0.000,0.000,0.000
+to_meter=1

no 7.2.2 available here for testing.

location created by the above proj4 string, now here also

g.proj -j                                                                       
+proj=stere
+lat_0=90
+lat_ts=70
+lon_0=-45
+k=1
+x_0=0
+y_0=0
+no_defs
+a=6378137
+rf=298.257223563
+towgs84=0,0,0,0,0,0,0
+to_meter=1

tested with

GRASS version: 7.4.0                                                            
GRASS SVN revision: r72154                                                      
Build date: 2018-01-27                                                          
Build platform: x86_64-w64-mingw32                                              
GDAL: 2.2.3                                                                     
PROJ.4: 4.9.3                                                                   
GEOS: 3.5.0                                                                     
SQLite: 3.17.0                                                                  
Python: 2.7.5                                                                   
wxPython: 2.8.12.1                                                              
Platform: Windows-8-6.2.9200 (OSGeo4W)  
r.in.gdal -o input=D:\temp\nc\foo.nc output=band1 band=1                        
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsProjected'.
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsGeographic'.
WARNING: Input contains subdatasets which may need to be imported separately
Input contains an invalid SRS. WKT definition:
PROJCS[
WARNING: Unable to convert input map projection information to GRASS format.
Over-riding projection check
Importing 366 raster bands...
Importing raster map <band1>...

and

GRASS version: 7.5.svn                                                          
GRASS SVN revision: r72230                                                      
Build date: 2018-01-12                                                          
Build platform: x86_64-w64-mingw32                                              
GDAL: 2.2.3                                                                     
PROJ.4: 4.9.3                                                                   
GEOS: 3.5.0                                                                     
SQLite: 3.17.0                                                                  
Python: 2.7.5                                                                   
wxPython: 2.8.12.1                                                              
Platform: Windows-8-6.2.9200 (OSGeo4W)  
r.in.gdal -o input=D:\temp\nc\foo.nc output=band2 band=2                        
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsProjected'.
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsGeographic'.
WARNING: Input contains subdatasets which may need to be imported separately
Input contains an invalid SRS. WKT definition:
PROJCS[
WARNING: Unable to convert input map projection information to GRASS format.
Over-riding projection check
Importing 366 raster bands...
Importing raster map <band2>...

though there is this error, the band seems to be imported.

wasn't there already a similar error with stere?

comment:5 in reply to:  4 Changed 21 months ago by mmetz

Replying to hellik:

r.in.gdal -o input=D:\temp\nc\foo.nc output=band2 band=2                        
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsProjected'.
ERROR 10: Pointer 'hSRS' is NULL in 'OSRIsGeographic'.
WARNING: Input contains subdatasets which may need to be imported separately
Input contains an invalid SRS. WKT definition:

This is the projection info as recognized by GDAL:

PROJCS[

it's incomplete.

WARNING: Unable to convert input map projection information to GRASS format.
Over-riding projection check
Importing 366 raster bands...
Importing raster map <band2>...

though there is this error, the band seems to be imported.

Yes, the error comes from GDAL and is not fatal, the band is still imported.

Anyway, I have fixed this error in r72251,2 (trunk, relbr74).

comment:6 Changed 17 months ago by neteler

Milestone: 7.4.17.4.2

comment:7 Changed 14 months ago by martinl

Resolution: fixed
Status: newclosed

Seems to be solved. Feel free to reopen if needed.

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