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QGIS is a cross-platform GIS application licensed under the GNU General Public License.

1 vote

Is it possible to conduct a flood model analysis with QGIS using a DEM?

I have not tested this in QGIS, but it should be possible. basically you use cost of distance to set the "cost" (as height) of the water flow. This way you get connected polygons of same hight. …
HC Haase's user avatar
  • 467
15 votes

Seeking model builder for QGIS?

Now you can access a model builder in QGIS from the: Processing menu -> Graphical modeler …
HC Haase's user avatar
  • 467
7 votes
2 answers
3k views

Simplified flood "model" / estimation from elevation data

I am using QGIS. Output I want to create flood area polygons of n m^3 of water. e.g. polygons showing the max. area that will be flooded if xx m^3 water is released. …
HC Haase's user avatar
  • 467
6 votes
Accepted

QGIS polygonize error 4 "file does not exist in the file system"?

@user30184 came with the solution. the (quite common GIS) problem was that non-ASCII characters (like æ ø å) in the path name gets deleted. only use ASCII characters in file paths.
HC Haase's user avatar
  • 467
3 votes
1 answer
16k views

QGIS polygonize error 4 "file does not exist in the file system"?

When I try to convert a raster DEM (in .asc or geotiff format) to polygons I get the error below: ERROR 4: `Y:/GIS/oversvmmelser/tmp/out.tif' does not exist in the file system, and is not recognis …
HC Haase's user avatar
  • 467