topic Re: dotted raster pattern in ArcGIS GeoStatistical Analyst Questions

dotted raster pattern

BrookeHodge — Fri, 17 Sep 2010 14:12:01 GMT

Hi,

I am using ordinary kriging to interpolate species distribution based on sightings per unit effort summarized by 5' squares to points. I have done this with many species and my outputs have looked great, but for some reason, the output for one dataset I have has shows dots all over it (where the point data i'm using to interpolate it is). I have attached a visual for reference. The input data does not differ from the other ones I've been using and I have used all the same methods and paramenters. This includes neighborhood smoothing, so altering this parameter does not fix the problem. Does anyone know why this is occuring or what I can do to fix it? I have used the Kernel smoothing method instead, and the output looks better, but I want to keep all my methods the same as I have used for the other species, so if there is a way to fix it usint ordinary kriging, that would be best.

Thanks in advance for your help!

Re: dotted raster pattern

EricKrause — Fri, 17 Sep 2010 15:08:41 GMT

On the semivariogram screen in the Wizard, what is your value for "Measurement Error"?

Re: dotted raster pattern

EricKrause — Fri, 17 Sep 2010 15:15:58 GMT

If you're willing to send your GA layer and the data used to create it, we'll take a look and try to figure out what's going on.

Re: dotted raster pattern

BrookeHodge — Fri, 17 Sep 2010 16:19:39 GMT

Hi again Eric, thanks for your response.

The measurement error option I have checked in the semivariogram window in the wizard is 100%.

I have sent a request asking if I can send you the data. Assuming it won't be a problem, is there a secure way of doing that? I don't feel comfortable sending it on a forum open to the public.

Thanks

Re: dotted raster pattern

EricKrause — Fri, 17 Sep 2010 16:21:45 GMT

You can send it to ekrause@esri.com

Re: dotted raster pattern

BrookeHodge — Fri, 17 Sep 2010 19:09:03 GMT

You may have already seen it, but I sent it to your email.