Depressions, pits - JiriVales/automatic-creation-orienteering-map GitHub Wiki

Find depression area

Model Find depression area Picture: Model Find depression area

Algorithm description

Find and vectorize depression from digital elevation model.
Used tools: SAGA - Fill sinks, Raster calculator, Polygonize, Extract by attribute

Input parameters

Digital elevation model (raster)
Raster representing the height of the terrain.
Format: raster

Outputs

Polygons_of_depression Area of depression.
Format: vector, polygon Areas of depressions (red) Picture: Areas of depressions (red)

Create pits and form lines of depressions

Model Create pits and form lines of depressions Picture: Model Create pits and form lines of depressions

Algorithm description

Finding very small depressions such as pits, holes and bigger depressions which will be represented as Form lines (auxiliary contour lines).
Used tools: Find depression area, Lines to polygon, Field calculator, Extract by location, Merge vector layers, Delete duplicate geometries, Extract by attribute, Polygon centroids, Polygons to lines, Delete column

Input parameters

Digital elevation model (raster)
Raster representing the height of the terrain.
Format: raster
Contours of depressions
Principal or thickened contours of depressions. For elimination duplication.
Format: vector, polyline

Outputs

Form_lines
Auxiliary contour lines of depression.
Format: vector, polyline
Pits
Pits, small depressions, holes.
Format: vector, point Pits (purple), Form lines of depressions (red) Pictures: Pits (purple), Form lines of depressions (red)

Create pits

Model Create pits Picture: Model Create pits

Algorithm description

Finding pits, holes, small depressions.
Used tools: Find depression area, Lines to polygon, Field calculator, Extract by location, Merge vector layers, Delete duplicate geometries, Extract by attribute, Polygon centroids

Input parameters

Digital elevation model (raster)
Raster representing the height of the terrain.
Format: raster
Contours of depressions
Principal or thickened contours of depressions. For elimination duplication.
Format: vector, polyline

Outputs

Pits
Pits, small depressions, holes.
Format: vector, point

Create form lines of depressions

Model Create form lines of derpessions Picture: Model Create form lines of derpessions

Algorithm description

Finding depressions which will be represented as Form lines (auxiliary contour lines).
Used tools: Find depression area, Lines to polygon, Field calculator, Extract by location, Merge vector layers, Delete duplicate geometries, Extract by attribute, Polygons to lines, Delete column

Input parameters

Digital elevation model (raster)
Raster representing the height of the terrain.
Format: raster
Contours of depressions
Principal or thickened contours of depressions. For elimination duplication.
Format: vector, polyline

Outputs

Form_lines_depression
Auxiliary contour lines of depression.
Format: vector, polyline