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I have a layer that describe rainfall for 10 years. Now I want to interpolate the area in ArcGIS Desktop (ArcMap) 10.7. As you know I should define some point on my area to extract the rainfall from the Layer.

How should I define these points i.e. in the center of pixels or more?

This is my Layer and a closed Border:

enter image description here

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    Why do you want to interpolate? You already have rainfall surfaces. – user2856 Dec 14 '19 at 22:56
  • Thanks, I want to smooth the colors. as you there are many squares in the Layer (bcoz the resolution is 0.25"x0.25"). – ali Dec 15 '19 at 7:12
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Use the Resample tool and specify bilinear or cubic as the resampling type.

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If your objective is just to smooth the colors, then no need to resample the data. You should only use resample during display feature in Display tab within Layer Properties window, and choose Bilinear Interpolation, instead of Nearest Neighbor as the default.

Nearest Neighbor (default) Nearest Neighbor (default)

Bilinear Interpolation Bilinear Interpolation

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  • Thanks you, it's very useful, the result is excellent :) – ali Dec 16 '19 at 8:23
  • Dear, also I have another problem. there is "no data" near some pixel at the cost. imgur.com/nsxHnZt ,How should I interpolate the area? – ali Dec 16 '19 at 11:30
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I have used Resample tool with Bilinear method to resample only the Layer :

enter image description here

then I went to Symbology Tab and set the Show to Classify: enter image description here

now you see the result:

enter image description here

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