Strange results from line of sight tool

Discussion created by jt7747 on Apr 28, 2010
Latest reply on Jun 6, 2013 by tsemerad
I don't understand the line of sight tool. I created a test raster, 10 by 10.

All cells are elevation 0 except for two cells that are elevation 10 (the blue cells).

I used the line of sight tool to check cell visibility. The tool claims some cells are hidden when in fact there's no obstruction in the line of sight. What's going on here? It would seem that ArcGIS is reinterpolating the elevation data before performing the line of sight operation. It's throwing away my data and making up its own.

Is this the same for viewsheds as well? What's going on here?

I need to see precise documentation to see how ArcGIS treats a DEM before it performs visibility calculations. If it resamples my data I need to know how.