dbrooksf

Kernel Interpolation with Barriers - unexplained results

Discussion created by dbrooksf on Sep 27, 2011
Latest reply on Sep 29, 2011 by EKrause-esristaff
I ran a Kernel Interpolation with Barriers using a stream buffer as my barrier.  Most of the results make visual sense to me, but there are results in tributaries of the mainstem river that I have no explanation for:

[URL=http://imageshack.us/photo/my-images/10/cpuevsinterpolationid.jpg/][/URL]

The data points I used to create the stream raster are included in the image above.  I've circled the incorrect results in blue.  These are at least the obvious ones, where instead of continuing to decrease in value (towards the red color direction) the values began to increase.

Can someone explain why this is occurring and what options are available to correct for this error?

Input variables are as follows: Output cell size 0.000833, Kernel function: Polynomials, Order polynomial: 1, Ridge parameter: 50, Output surface type: Prediction

Thanks!

Daniel

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