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Viewshed change with extent

Question asked by modybsystematics-co-il-esridist Employee on Aug 28, 2018
Latest reply on Aug 28, 2018 by Dan_Patterson

Hello all


I run into strange results for Viewshed I wonder if anybody can explain it.

In viewshed1 attachment you can see my first viewshed (GP tool), The red box is just for reference. I opened the env menu and select the extent as "same as display". The results are in the layer "center"

Then I pan the screen a little (see the red box in the second screenshot), select again the "same as display" for extent and run the same command again.

The results are in  the "shifted" layer.

See the zoomin into some area in the last screenshot. It found different visibility only because the extent (that was far away from this area) was changed!!

My understanding is the the visibility between the overlap of the two extents should be the same.


Any Idea?