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zoran-cuckovic / QGIS-visibility-analysis

Quantum GIS plugin for visibility analysis
GNU General Public License v3.0
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Negative values for observer height #48

Closed GustyLa closed 3 years ago

GustyLa commented 3 years ago

Would it be possible to make the observer height accept negative values? I would like to know how visible an existing mound would be if it were 5m lower, but entering negative values only returns an all 0 values raster.

zoran-cuckovic commented 3 years ago

Hello, An underground viewshed cannot be implemented... You'll need to edit your DEM, in order to remove the mounds. See https://gis.stackexchange.com/questions/40873/modifying-single-pixel-values-in-qgis

GustyLa commented 3 years ago

Hello. Thanks for the tip - and keep up the good work! The extension is great!