Sign up ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

I am running: gdal_contour -a elev hazard_interp4.asc haz_ak_contour_4_10 -i 10

the hazard_interp4.asc file has values in band 1 (singel band gray).

With the above command, I get a shapefile that has no values.

If I burn a color schema into the raster with gdaldem color-relief, then I can successfully create a contour shapefile. However I would prefer to not have to do this step.

Update: the output of hazard_interp4.asc is:

Driver: AAIGrid/Arc/Info ASCII Grid
Files: hazard_interp4.asc
Size is 300, 300
Coordinate System is `'
Origin = (-19003400.000000000000000,11484799.899999998509884)
Pixel Size = (10698.000000000000000,-15086.032999999999447)
Corner Coordinates:
Upper Left  (-19003400.000,11484799.900) 
Lower Left  (-19003400.000, 6958990.000) 
Upper Right (-15794000.000,11484799.900) 
Lower Right (-15794000.000, 6958990.000) 
Center      (-17398700.000, 9221894.950) 
Band 1 Block=300x1 Type=Float32, ColorInterp=Undefined
  Min=0.005 Max=0.595 
  Minimum=0.005, Maximum=0.595, Mean=0.141, StdDev=0.141
  NoData Value=-9999
share|improve this question
can you give us the output of gdalinfo hazard_interp4.asc -stats ? – mdsumner Feb 18 '13 at 11:32

1 Answer 1

Um, Minimum=0.005, Maximum=0.595 and you appear to be using a contour interval of 10. This might be the problem.


share|improve this answer
I can't believe I did not see that! thanks – Bwyss Feb 19 '13 at 8:26

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.