dotted raster pattern

Discussion created by wikgrebc on Sep 17, 2010
Latest reply on Sep 17, 2010 by wikgrebc

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!