Werner, You swapped the X and Y extents in the command.
On Thu, Jan 27, 2011 at 11:14 PM, Werner Reiche <w.rei...@hotmail.com>wrote: > > I'm trying to use gdal_grid to generate a .tiff file from a .csv file. > > The problem I am encountering is that output file always contains 'no-data' > values. > > The command I am using is: > > gdal_grid -txe -51.428009 -43.153992 -tye 46.112598 51.347198 -outsize 1024 > 796 \ > -a nearest:radius1=10.0:radius2=10.0:angle=0.0:nodata=0.0 \ > -l rs2_file_1 -l rs2_file_2 -l rs2_file_3 \ > -of GTiff -ot Byte rs2_file.vrt test.tiff > > I have also tried the following interpolation parameters: > > # Results in all black > # -a nearest:radius1=1.0:radius2=1.0:angle=0.0:nodata=0.0 \ > # -a average:radius1=1.0:radius2=1.0:angle=0.0:min_points=1:nodata=0.0 \ > # -a > invdist:radius1=1.0:radius2=1.0:angle=0.0:max_points=1:min_points=1:nodata=0.0 > \ > > # Results in all one shade of grey (average of entire image) > # -a > invdist:radius1=0.0:radius2=0.0:angle=0.0:max_points=10:min_points=1:nodata=0.0 > \ > > The .vrt and csv file used are shown below. > > rs2_file.vrt > :::::::::::::: > <OGRVRTDataSource> > <OGRVRTLayer name="rs2_file_1"> > <SrcDataSource>rs2_file_1.csv</SrcDataSource> > <GeometryType>wkbPoint25D</GeometryType> > <GeometryField encoding="PointFromColumns" x="lon" y="lat" z="red"/> > </OGRVRTLayer> > <OGRVRTLayer name="rs2_file_2"> > <SrcDataSource>rs2_file_2.csv</SrcDataSource> > <GeometryType>wkbPoint25D</GeometryType> > <GeometryField encoding="PointFromColumns" x="lon" y="lat" z="green"/> > </OGRVRTLayer> > <OGRVRTLayer name="rs2_file_3"> > <SrcDataSource>rs2_file_3.csv</SrcDataSource> > <GeometryType>wkbPoint25D</GeometryType> > <GeometryField encoding="PointFromColumns" x="lon" y="lat" z="blue"/> > </OGRVRTLayer> > </OGRVRTDataSource> > rs2_file.vrt (partial) > :::::::::::::: > lat,lon,red,green,blue > -51.428009,50.522499,0,0,143 > -50.049011,50.720699,0,0,143 > -48.660004,50.902401,0,159,255 > -47.260010,51.067501,0,239,255 > -45.851013,51.215900,255,255,15 > -44.433014,51.347198,255,191,0 > -50.433014,50.657600,255,255,0 > -49.046997,50.844200,255,223,0 > -47.649994,51.014301,255,159,0 > -46.243988,51.167599,255,191,0 > -44.829010,51.303799,255,255,15 > -50.816010,50.593800,255,255,0 > -49.433014,50.784698,255,175,0 > -48.040009,50.959202,255,239,0 > -46.635986,51.117100,255,191,0 > -45.222992,51.257999,255,223,0 > -51.197998,50.528301,255,175,0 > -49.819000,50.724098,255,191,0 > -48.428009,50.903500,255,223,0 > -47.028015,51.066299,255,207,0 > -45.618011,51.211800,255,255,0 > -44.199005,51.340199,255,255,0 > -50.203003,50.661999,223,255,47 > -48.816010,50.845798,255,223,0 > -47.417999,51.013000,255,191,0 > -46.010986,51.163502,255,207,0 > -44.595001,51.297001,255,255,15 > -50.585999,50.598900,255,191,0 > -49.201996,50.787601,255,255,0 > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9494447584 17.2416N 80.1426E
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