# How To Create Multi-Visibility Raster

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03-06-2019 02:57 PM
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New Contributor

I used the visibility tool to create four separate visibility rasters from four different locations.  I now need to create a raster showing only the areas that all four of the visibility points can see.  Does anyone know what tool I should use to create this kind of raster?

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Regular Contributor

Great!  Can you mark my answer as CORRECT so it flags this thread as finished?

Jay
Washoe County GIS
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Regular Contributor

You can do this with #raster calculator in Desktop.  Assuming each of your visibility rasters contain values of 0 (non-visible) and 1(visible), if you add all the rasters together, the resulting raster will have values ranging from 0 to 4, where the integer indicates how many visibility points can see each cell.

Alternatively, the Visibility tool will let you use multiple observer points and will do all the work for you:

Jay
Washoe County GIS
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New Contributor

doing that shows all the viewsheds at once, but I need to show only the areas that all four of these observation points can see together in one viewshed

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Regular Contributor

STEP ONE:  Run visibility tool with all observer points in a single shapefile.

This yields a raster showing what is visible from ANY of the obervers, but also with cell values ranging from 0 to 4, indicating how MANY observers can see each cell.

STEP TWO:  Use Raster Calculator to generate a raster that only includes cells visible from 4 observers:

In my example there are only a few cells that are actually visible from all 4 observers, shown by the green cells.  Black indicates not visible.

Jay

Jay
Washoe County GIS
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New Contributor

That worked, Thank you very much.  I appreciate it!!!

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Regular Contributor

Great!  Can you mark my answer as CORRECT so it flags this thread as finished?

Jay
Washoe County GIS
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New Contributor

another way to put it, i need to know the areas on the ground that have a visual of all 4 of the observations points.