topic Re: EBK 3D fields in ArcGIS GeoStatistical Analyst Questions

EBK 3D fields

AlexMora — Tue, 29 Jan 2019 23:52:17 GMT

Question about the z-coordinate and the measured value as it is described in the tool.

"Empirical Bayesian kriging 3D is a geostatistical interpolation method that uses Empirical Bayesian Kriging to interpolate 3D point data. All points must have x-, y-, and z-coordinates and a measured value to be interpolated."

What if my points to be used to create the surface (interpolate) are the same, the measured value (value_field) and the z-coordinate (elevation_field). I am trying to create a groundwater elevation surface and the z value is the water depth from sea level. Do I use the same values for both fields in the EBK tool?

it kind of makes sense if it is a concentration value for instance at a x,y,z location and then it is clear what field values to use.

elevation_field

The in_features field containing the elevation value of each input point.

If the elevation values are stored as geometry attributes in Shape.Z, it is recommended that you use that field. If the elevation values are stored in an attribute field, the elevation values must indicate distance from sea level. Positive values indicate distance above sea level, and negative values indicate distance below sea level.

Field

value_field

The in_features field containing the measured values that will be interpolated.

Field

Any feed back? thanks. Alex

Re: EBK 3D fields

EricKrause — Wed, 30 Jan 2019 14:49:15 GMT

Hi Alex,

If I'm understanding correctly, you have points with a measured elevation, and you want to interpolate that elevation. In this case, you should actually just use regular 2D Empirical Bayesian Kriging and provide the elevation as the "z-field" parameter.

EBK3D is used when the location of the points are in 3D, and each 3D point has a measured value. For example, you can interpolate oxygen measurements taken at various locations and depths in the ocean into a full 3D model that predicts oxygen throughout the ocean (this particular example will be shown in an upcoming LearnGIS lesson).

Let me know if that isn't clear.

-Eric

Re: EBK 3D fields

AlexMora — Fri, 01 Feb 2019 06:30:58 GMT

Thank you Eric for clarification, explanation and suggestion. I will be on the look for the lesson.

Alex