I have a wind speed point data which I interpolated using IDW. While interpolating, it asks for output cell size. I am confused as in it is in which unit?

My data is in UTM projection and WGS 84 datum. Map units and display units are in meters.

I am using ArcGIS 10.2.2.

Reason that I am confused because if I want 5 Kilometer cell size and I give 5000 value to "output cell size", then it is not taking the value and error is coming.

  • Your logic seems correct. Can you edit your question by specfying what error you receive?
    – fatih_dur
    Commented Jan 2, 2017 at 7:48

1 Answer 1


By default, the environment is set to the same coordinate system as the input data (not the map), but maybe this is overwritten in your case (main menu > geoprocessing > environment). From the IDW tool, press the "environment" button, go to "Output coordinates" and manually select you UTM projection. The unit should then be in meters.

As a remark, you can check from the properties of your dataset what is the coordinate system of your data (right click > properties > sources).


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