This Model is made available under the CC-0 license.
Model
Viewshed and viewpoint (vector output)
This model automates viewshed analysis in QGIS, converting raster output to vector polygons. GDAL is used for vieshed analysis. Originally used for optimizing IoT gateway placement, it includes input attributes like antenna height and building floors. The observer height is calculated as antenna height + (building floor count * 3), where floor height is fixed at 3 meters, making the model adaptable for urban visibility studies.
Features:
- Converts viewshed results to vector polygons.
- Retains input attributes like antenna and building floors.
- Observer height is calculated automatically through an expression.
Changelog: V2.2 * Output layers name shows the location name by using Load layers into project algorithm * Outputs are no longer grouped V2.1 * Changed [raster pixels to polygon] to Polygonize (GDAL) V2.1.1 *Bug Fix - Total Height expression invalid
03 October 2024
25 February 2025
25 February 2025
Asj
vector
point
polygon
Viewshed analysis
viewshed
Hi, the model works, but it run out of memory my machine with default parameters, because it collected a lot of pixels, which are converted to squared polygons and dissolved. Polygonize the viewshed raster instead of pixels to polygons and dissolve could be more efficient, and keeping the default gdal viewshed parameters might also be nicer. Regarding the model image, please note the environmental and ethical implications of using generative artificial intelligence. Still, thank you for your contribution!
Reviewed by gabrieldeluca 8 months, 2 weeks ago
Thank you!
Reviewed by gabrieldeluca 8 months, 2 weeks ago
Thank you!
Reviewed by gabrieldeluca 8 months, 1 week ago
Thank you!
Reviewed by gabrieldeluca 4 months ago
gabrieldeluca approved these changes 4 months ago
