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Thread: Kriging Extent Problems

  1. #1
    Renee Huset
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    Default Kriging Extent Problems

    Hi--

    I'm working with the geostatistical wizard and having issues getting kriging predictions to extend throughout my study area. Currently, I'm working with a point file for California, and though the points are distributed throughout a large portion of the state, they do not extend to the N/S and E/W borders of the state, leaving a few areas without observations. When I run a kriging model with these data, the output extent is a polygon that covers only the area between the furthest north and south points and between the furthest east and west points, leaving out a fair amount of the state. I understand the logic behind the extent I'm getting as an output, but I still need a kriging surface that includes the areas currently left out of the calculation. How do I get this? I've tried going through the geoprocessing environments and editing my processing extent, but have had no luck.

    Any tips? Perhaps I'm missing something obvious...

    Thanks,
    Renee

  2. #2
    Eric Krause

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    Default Re: Kriging Extent Problems

    The default extent of a geostatistical layer is the rectangular extent of the input points. If you want to change the extent, right-click the layer in ArcMap's table of contents, and choose "Properties". Go to the Extent tab, and you can define a different extent (like the extent of California).

    For more information about changing the extent and clipping a geostatistical layer, see the link below. Skip down to steps 12-20 in the section titled "Create a surface using the default options."

    http://help.arcgis.com/en/arcgisdesk...00000p0000000/


    If you have any further questions about geostatistics, you'll get the quickest response by using the Geostatistical Analyst Forum:

    http://forums.arcgis.com/forums/100-...stical-Analyst

    Good luck, and I hope this helped.
    Last edited by Eric6346; 04-13-2012 at 11:47 AM.
    Eric Krause
    Geostatistical Analyst Product Engineer

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