checkerboard pattern in viewshed layer

Trace Baker's Avatar

Trace Baker

09 Jun, 2019 12:00 AM

Sometimes when I add a viewshed layer, I see a checkerboard pattern on what appears to be a uniform slope. Example attached. I didn't see mention of this in the knowledge base. What is the algorithm telling me?

  1. 1 Posted by Trace Baker on 09 Jun, 2019 06:01 PM

    Trace Baker's Avatar

    Additional note to my earlier post: I drew a line through several of the pink patches and tangental to one of the contour lines. When I plotted the profile of the line, there was no difference in elevation between the pink patches and the green background.

  2. Support Staff 2 Posted by matt on 10 Jun, 2019 10:08 PM

    matt's Avatar

    Generally it means that the angle of the ground is close to tangential to the line of sight. The elevation data used is stored as integer meters, and so when something is borderline viewable or not, you'll get a pattern like that as some areas appear visible while neighboring cells don't.

  3. 3 Posted by Trace Baker on 11 Jun, 2019 12:12 AM

    Trace Baker's Avatar

    Matt,

    Understood, and I can see that when I run a profile from the viewpoint through the checkerboard. Thanks for a quick response.

    Trace Baker.

    303.249.7674

    all true paths lead through mountains
    Gary Snyder

  4. rmarcucci closed this discussion on 11 Jun, 2019 04:43 PM.

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