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

Is it possible to create contour lines based on part of the points and not the entire dataset?

share|improve this question
Export the points to a new shapefile or have them selected while running the function (the latter might only work in Arcgis, not sure on Qgis) – Martin Jan 16 '14 at 14:53
@martin, thanks. I copied part of the sata to a new layer and tried creating contours, but it did't work. It's a very very small area (few sq. meters) and very large differences (several 100s) between the value of each point (being the concentration of a contaminenet). Is it possible to draw by hand a line between the point? – H.Wiener Jan 19 '14 at 8:57
Of course it's possible, but if there's such a big change in a short distance it might be hard to visualize with contour lines. I would recommend that you rasterize the values using some interpolation method instead. – Martin Jan 19 '14 at 11:17

Your Answer


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

Browse other questions tagged or ask your own question.