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24.1.20. Vector coverage
24.1.20.1. Dissolve coverage
Operates on a coverage (represented as a set of polygon features with exactly matching edge geometry) to dissolve (union) the geometries. It provides a heavily optimized approach for unioning these features compared with the standard Dissolve tools.
Zobacz także
Parametry
Etykieta |
Nazwa |
Typ |
Opis |
|---|---|---|---|
Warstwa wejściowa |
|
[vector: polygon] |
Input polygon vector layer |
Agreguj |
|
[vector: polygon] Default: |
Specify the output vector layer. One of:
The file encoding can also be changed here. |
Wyniki
Etykieta |
Nazwa |
Typ |
Opis |
|---|---|---|---|
Agreguj |
|
[vector: polygon] |
The output polygon vector layer with dissolved geometries. |
Kod pythona
ID algorytmu: native:coverageunion
import processing
processing.run("algorithm_id", {parameter_dictionary})
The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.
24.1.20.2. Simplify coverage
Operates on a coverage (represented as a set of polygon features with exactly matching edge geometry) to apply a Visvalingam–Whyatt simplification to the edges, reducing complexity in proportion with the provided tolerance, while retaining a valid coverage (i.e. no edges will cross or touch after the simplification). Geometries will never be removed, but they may be simplified down to just a triangle. Also, some geometries (such as polygons which have too few non-repeated points) will be returned unchanged.
If the input dataset is not a valid coverage due to overlaps, it will still be simplified, but invalid topology such as crossing edges will still be invalid.
Requires version of GEOS >= 3.12
Parametry
Etykieta |
Nazwa |
Typ |
Opis |
|---|---|---|---|
Warstwa wejściowa |
|
[vector: polygon] |
Input polygon vector layer |
Tolerancja |
|
[numeric: double] Domyślnie: 0.0 |
The maximum distance (in unit of choice) between two consecutive vertices to get merged. |
Preserve boundary |
|
[wartość logiczna] Domyślnie: False |
When enabled, the outside edges of the coverage will be preserved without simplification |
Uproszczony |
|
[vector: polygon] Default: |
Specify the output vector layer. One of:
The file encoding can also be changed here. |
Wyniki
Etykieta |
Nazwa |
Typ |
Opis |
|---|---|---|---|
Uproszczony |
|
[vector: polygon] |
The output polygon vector layer, with a lower number of vertices. |
Kod pythona
ID algorytmu: native:coveragesimplify
import processing
processing.run("algorithm_id", {parameter_dictionary})
The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.
24.1.20.3. Validate coverage
Analyzes a coverage (represented as a set of polygon features with exactly matching edge geometry) to find places where the assumption of exactly matching edges is not met. Invalidity includes polygons that overlap or that have gaps smaller than the specified gap width.
Requires version of GEOS >= 3.12
Zobacz także
Parametry
Etykieta |
Nazwa |
Typ |
Opis |
|---|---|---|---|
Warstwa wejściowa |
|
[vector: polygon] |
Input polygon vector layer |
Gap width |
|
[numeric: double] Domyślnie: 0.0 |
The maximum width of gap to detect |
Invalid edges |
|
[vector: line] Default: |
Specify the output vector layer. One of:
The file encoding can also be changed here. |
Wyniki
Etykieta |
Nazwa |
Typ |
Opis |
|---|---|---|---|
Invalid edges |
|
[vector: line] |
The output line vector layer showing error edges for each invalid polygon. |
Validity result |
|
[wartość logiczna] |
Returns whether the coverage is valid or not. |
Kod pythona
ID algorytmu: native:coveragevalidate
import processing
processing.run("algorithm_id", {parameter_dictionary})
The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.