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!    

[JayantaPoddar · Accepted solution]

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.

[AshleyDouglas]

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

[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 

[SteveLynch]

You don't have to do anything.

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

-Steve