I have a data from the Weather station with SWEmax (snow water equivalent) collected over 40 years. I need to interpolate the data over my river's watershed and then, somehow, determine the differences which might have happened over this time.

  • Which tools do I need to use in ArcGIS 10.1 to achieve this?
  • Do I need to make z-surfaces first and then take statistics from them?
  • Is the best way to show the differences is to use a diagram with years on the x-axis?


  • I'm not sure if I understood you. But, I think you could for each year creata a Layer. Then, make a Model Builder to make interpolations. – ChristianAbreu Oct 18 '12 at 17:09
  • Tnx. But its not the case. The main question is: which tools to use to see the differences between interpolated surfaces? – d1mOoOon Oct 18 '12 at 17:27
  • 2
    Differences between surfaces = map algebra (Subtract annual surfaces to see normalized differences) – U2ros Oct 19 '12 at 12:39

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