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Do IDWs (Geostatistical Analyst) include null values?

AshleyDouglas

I have a large data set with point data and there are a few points that have null values on certain days (the sites didn't record data for that particular day). I wanted to produce a map using IDW (Geostatistical Analyst tool) for these points on different days but I did not want to the IDW interpolation to include the null values.

How do I ensure this doesn't happen?

Any help would be much appreciated!

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Accepted answers

JayantaPoddar

You could create a definition query in the point layer (Layer Properties > Definition Query). You could use the Query Builder to write the query.

<FieldName> IS NOT NULL

Then you could run the IDW or other interpolation techniques on the same layer.

All comments

SteveLynch

You don't have to do anything.

The interpolation tools in Spatial Analyst and Geostatistical Analyst automatically ignore Null values 🙂

-Steve

JayantaPoddar

I am glad I could help. You could mark my comment as "Correct Answer", if it resolved the issue. It will help others looking to resolve a similar problem.

Mark a reply as the Correct Answer

AshleyDouglas

Just wanted to say thank you for your help. Much appreciated.

JayantaPoddar

You could create a definition query in the point layer (Layer Properties > Definition Query). You could use the Query Builder to write the query.

<FieldName> IS NOT NULL

Then you could run the IDW or other interpolation techniques on the same layer.

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