Do IDWs (Geostatistical Analyst) include null values?

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07-25-2017 12:34 AM
AshleyDouglas
New Contributor

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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JayantaPoddar
MVP Esteemed Contributor

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.



Think Location

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4 Replies
JayantaPoddar
MVP Esteemed Contributor

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.



Think Location

View solution in original post

AshleyDouglas
New Contributor

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

JayantaPoddar
MVP Esteemed Contributor

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 



Think Location
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SteveLynch
Esri Regular Contributor

You don't have to do anything.

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

-Steve

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