topic Re: Kriging issue - not using all my data points in ArcGIS GeoStatistical Analyst Questions

Kriging issue - not using all my data points

LeahVB — Mon, 25 Feb 2013 22:31:54 GMT

Hi,

I am using kriging to interpolate groundwater level data. I have georeferenced x and y coordinates, and my z coordinate is the water level. However, once I produce the kriged dem, not all of the z values are being used. Any idea what this problem could be?

Thanks,
Leah

Re: Kriging issue - not using all my data points

EricKrause — Tue, 26 Feb 2013 14:09:27 GMT

How did you determine that the software isn't using all your points?

Re: Kriging issue - not using all my data points

LeahVB — Fri, 01 Mar 2013 03:01:24 GMT

For example, I have z values between 44.7 and 359.7. When I perform the kriging function, the values displayed are only between 115.85 and 259.94. It will not allow me to manually change the kriged values.

I have an error message that says, 000957 : Skipping feature(s) because of NULL or EMPTY geometry. I have played around with changing the search radius to no avail.

Re: Kriging issue - not using all my data points

EricKrause — Fri, 01 Mar 2013 14:49:56 GMT

When you talk about the output being between 115.85 and 259.94, is that from a raster or a geostatistical layer?

Next, check how many data points have Null values or empty geometry. Any point with Null values or empty geometry will not be used in the calculation.