Hello:
On 04/04/2022 13:38, Amit Ghosh wrote:
Hi,
I tried to export a vector file to use it in another application. The
module returns an error message that says "Unable to create OGR
spatial reference". The detailed output is here:
v.out.ogr input=MDG_UNSALB_admin3_selectionSN5@PERMANENT
output=/home/amit/Documents/mdg_aoi2_.gpkg
ERROR 10: Pointer 'hSRS' is NULL in 'OSRImportFromWkt'.
ERROR: Unable to create OGR spatial reference
Projection info
g.proj -p
-PROJ_INFO-------------------------------------------------
I would guess that this is the problem:
name : unknown
datum : wgs84
ellps : wgs84
proj : aea
lat_0 : 0
lon_0 : 25
lat_1 : 20
lat_2 : -23
x_0 : 0
y_0 : 0
no_defs : defined
towgs84 : 0.000,0.000,0.000
-PROJ_UNITS------------------------------------------------
unit : meter
units : meters
meters : 1
I cannot figure out where I am wrong. Can you suggest an alternative?
How did you initially create the GRASS Location? Is the albers equal
area projection described by a standard EPSG code? It appears to be this
one:
https://epsg.io/102022
**IF** that's the correct projection, then you should be able to do:
echo
"PROJCS["Africa_Albers_Equal_Area_Conic",GEOGCS["GCS_WGS_1984",DATUM["WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Albers_Conic_Equal_Area"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["longitude_of_center",25],PARAMETER["Standard_Parallel_1",20],PARAMETER["Standard_Parallel_2",-23],PARAMETER["latitude_of_center",0],UNIT["Meter",1],AUTHORITY["EPSG","102022"]]"
| g.proj -c wkt=-
That long WKT string will reset the projection definition of the
Location, then you should be able to export OK.
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--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918
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