1

I performed IDW using ArcGIS on 121 evenly distributed samples and generated a surface.

How do I check the accuracy of the method?

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3

In order to evaluate the accuracy of your interpolated surface you either need:

  • additional samples

or

  • to remove some random samples prior to interpolation

These are used to cross-validate your result.

On your created IDW layer you right-click and choose Validation/Prediction.

This link actually describes the process: https://desktop.arcgis.com/de/arcmap/latest/extensions/geostatistical-analyst/using-validation-to-assess-models.htm

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