topic Re: Do IDWs (Geostatistical Analyst) include null values? in ArcGIS GeoStatistical Analyst Questions

Do IDWs (Geostatistical Analyst) include null values?

AshleyDouglas — Tue, 25 Jul 2017 07:34:26 GMT

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!

Re: Do IDWs (Geostatistical Analyst) include null values?

JayantaPoddar — Tue, 25 Jul 2017 08:51:01 GMT

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.

Re: Do IDWs (Geostatistical Analyst) include null values?

AshleyDouglas — Wed, 26 Jul 2017 02:13:23 GMT

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

Re: Do IDWs (Geostatistical Analyst) include null values?

JayantaPoddar — Wed, 26 Jul 2017 03:36:36 GMT

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

Re: Do IDWs (Geostatistical Analyst) include null values?

SteveLynch — Wed, 26 Jul 2017 15:17:04 GMT

You don't have to do anything.

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

-Steve