Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have a raster surface that I kriged in Surfer and imported to Grass GIS but when I view it in QGIS, the null values outside of the interpolated surface take an extreme value and wash out the resolution in the rest of my surface. Is there an easy way to stop the null values from being assigned off the scale values?

share|improve this question

Tell QGIS to treat those NULL values as NULL values: Go to Transparency tab and set the value there. This value will then be ignored when calculating color maps.

An alternative is to set min/max values manually using "Custom min/max values" in Style tab.

share|improve this answer

It works quite well to set the "No data value" in the upper right corner of the Transparency tab to 0.

share|improve this answer
Can you please expand a bit on this answer. It may be correct but to be helpful to future readers a bit of explanation/background often helps. – Michael Miles-Stimson Sep 30 '15 at 23:02

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.