24.1.3. Check Geometry

24.1.3.1. Dangle-end lines 

Detects dangle-end lines in line geometries and reports them as errors. A dangle-end line is a line feature that terminates at a vertex connected to only one segment, resulting in an endpoint without a proper connection.

../../../../_images/check_geometry_dangleendlines.png — Fig. 24.2 Errors for dangle-end lines are reported on line features, and entire features with dangling ends are highlighted in red for clarity.

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Dangle-end errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the errors location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Dangle-end features Optional	`OUTPUT`	[vector: line] Default: `[Skip output]`	Line layer containing the identified dangle-end line features. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Dangle-end errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part containing the dangle-end.
gc_ringidx: the index of the feature’s geometry ring containing the dangle-end.
gc_vertidx: the vertex index of the dangle-end in the feature.
gc_errorx: the x coordinate of the dangle-end.
gc_errory: the y coordinate of the dangle-end.
gc_error

Dangle-end features

OUTPUT

[vector: line]

Output line layer containing the input dangle-end features. If no dangle-end features are found, the output layer will be empty.

Python code

Algorithm ID: native:checkgeometrydangle

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.

24.1.3.2. Duplicated geometries 

Checks for duplicated geometries in a vector layer, and reports them as errors.

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: geometry]	Layer with the geometries to check
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification
Duplicate geometries errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the errors location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Duplicate geometries Optional	`OUTPUT`	[vector: same as input] Default: `[Skip output]`	Specification of the output layer containing the geometries that were found to be duplicated. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Duplicate geometries errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx
gc_ringidx
gc_vertidx
gc_errorx: the x coordinate of the centroid of the duplicate geometry.
gc_errory: the y coordinate of the centroid of the duplicate geometry.
gc_error: the indices of the duplicate geometry (all except the highest index).

Duplicate geometries

OUTPUT

[vector: same as input]

Output layer containing the geometries that were found to be duplicated. Available fields are the same as in the ERRORS output.

Python code

Algorithm ID: native:checkgeometryduplicate

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.

24.1.3.3. Duplicated vertices 

Checks for duplicated vertices in line or polygon geometries, and reports them as errors.

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line, polygon]	Layer with the geometries to check
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification
Duplicated vertices errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the errors location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Duplicated vertices features Optional	`OUTPUT`	[vector: same as input] Default: `[Skip output]`	Specification of the output layer containing the features with duplicated vertices. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Duplicated vertices errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part containing the duplicate vertex.
gc_ringidx: the index of the feature’s geometry ring containing the duplicate vertex.
gc_vertidx
gc_errorx: the x coordinate of the duplicate vertex.
gc_errory: the y coordinate of the duplicate vertex.
gc_error

Duplicated vertices features

OUTPUT

[vector: same as input]

Output layer containing the features with duplicated vertices. Available fields are the same as in the ERRORS output.

Python code

Algorithm ID: native:checkgeometryduplicatenodes

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.

24.1.3.4. Features inside polygon 

Checks the input geometries contained in the polygons from the polygon layers list. A polygon layer can be checked against itself. Any contained features are reported as errors.

../../../../_images/check_geometry_featuresinsidepolygon.png — Fig. 24.3 Reporting errors on features inside a polygon.

See also

Delete features

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: geometry]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Polygon layers	`POLYGONS`	[vector: polygon][list]	List of polygon layers to check against.
Errors from contained features	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Point layer representing the contained features. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Contained features Optional	`OUTPUT`	[vector: same as input] Default: `[Skip output]`	Specification of the output layer containing features within the checked polygons. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Errors from contained features

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx
gc_ringidx
gc_vertidx
gc_errorx: the x coordinate of the centroid of the contained feature.
gc_errory: the y coordinate of the centroid of the contained feature.
gc_error: the layer name and feature ID of a polygon that contains the feature.

Contained features

OUTPUT

[vector: same as input]

Output layer containing features within the checked polygons. Available fields are the same as in the ERRORS output.

Python code

Algorithm ID: native:checkgeometrycontained

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.

24.1.3.5. Holes 

Detects holes in polygon geometries and reports them as errors.

../../../../_images/check_geometry_holes.png — Fig. 24.4 Reporting errors for holes on a polygon feature.

See also

Fill holes

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: polygon]	Layer with the geometries to check
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification
Holes errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the errors location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Polygons with holes Optional	`OUTPUT`	[vector: polygon] Default: `[Skip output]`	Polygon layer with the features containing holes. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Holes errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part containing the hole.
gc_ringidx: the index of the feature’s geometry ring containing the hole.
gc_vertidx
gc_errorx: the x coordinate of the centroid of the hole.
gc_errory: the y coordinate of the centroid of the hole.
gc_error

Polygon with holes

OUTPUT

[vector: polygon]

Output polygon layer with features containing holes. If no holes are found, the output layer will be empty. Available fields are the same as in the ERRORS output.

Python code

Algorithm ID: native:checkgeometryhole

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.

24.1.3.6. Lines intersecting each other 

Checks intersections between line geometries within a layer. Intersections between two different lines are errors.

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Intersection errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the intersections location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Intersecting feature Optional	`OUTPUT`	[vector: line] Default: `[Skip output]`	Specification of the output layer for features intersecting each other. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Intersection errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field referring to an intersecting input feature, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part where the intersection occurs.
gc_ringidx
gc_vertidx
gc_errorx: the x coordinate of the intersection point.
gc_errory: the y coordinate of the intersection point.
gc_error: the layer name and index of the other intersecting feature.

Intersecting feature

OUTPUT

[vector: line]

Output layer containing, for each identified intersection, the feature (with same UNIQUE_ID value) it belongs to. If no intersections are found, the output layer will be empty. Additional fields are available (see ERRORS output).

Python code

Algorithm ID: native:checkgeometrylineintersection

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.

24.1.3.7. Lines intersecting other layer 

Checks if the input line layer features intersect with the check layer features. An input feature that intersects with a check layer feature is an error.

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Check layer	`CHECK_LAYER`	[vector: line, polygon]	Layer with the geometries to check against.
Line intersecting other layer errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output point layer containing the locations of intersection errors. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Line intersecting other layer features Optional	`OUTPUT`	[line] Default: `[Skip output]`	Line layer with the input features that intersect features in the check layer. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Line intersecting other layer errors

ERRORS

[vector: point]

Output point layer representing the error location and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part where the intersection occurs.
gc_ringidx
gc_vertidx
gc_errorx: the x coordinate of the intersection point.
gc_errory: the y coordinate of the intersection point.
gc_error: the index of the check layer where the intersection occurs.

Line intersecting other layer features

OUTPUT

[vector: line]

Output layer containing, for each identified intersection, the input feature it belongs to. If no intersections are found, the output layer will be empty. Additional fields are available (see ERRORS output).

Python code

Algorithm ID: native:checkgeometrylinelayerintersection

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.

24.1.3.8. Overlaps 

Calculates overlapping areas in polygon geometries, and reports areas smaller than a given minimum as errors.

../../../../_images/check_geometry_overlaps.png — Fig. 24.5 Hashed polygons indicate overlapping areas smaller than the specified minimum.

See also

Delete overlaps

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: polygon]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Min overlap area	`MIN_OVERLAP_AREA`	[numeric: double]	Minimum area of the overlap to be reported as an error. If set to 0, all overlaps are reported.
Overlap errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing centroid points of the overlapping areas. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Overlap features Optional	`OUTPUT`	[vector: polygon] Default: `[Skip output]`	Specification of the output layer for features containing overlaps. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Overlap errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_errorx: the x coordinate of the centroid of the overlapping area.
gc_errory: the y coordinate of the centroid of the overlapping area.
gc_error: the area of the overlapping geometry.
gc_overlap_feature_{unique_id}: the UNIQUE_ID field value for the overlapping feature.

Overlap features

OUTPUT

[vector: polygon]

Output layer containing the overlapping areas. Additional fields are available (see ERRORS output).

Python code

Algorithm ID: native:checkgeometryoverlap

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.

24.1.3.9. Self-intersections 

Detects self-intersections in line or polygon geometries, and reports them as errors.

../../../../_images/check_geometry_selfintersections.png — Fig. 24.6 Reporting errors on features with self-intersections.

See also

Split self-intersecting geometries

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line, polygon]	Layer with the geometries to check
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification
Self-intersecting errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the errors location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Self-intersecting features Optional	`OUTPUT`	[same as input] Default: `[Skip output]`	Line or polygon layer containing self-intersected features. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Self-intersecting errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part where the self-intersection occurs.
gc_ringidx: the index of the feature’s geometry ring where the self-intersection occurs.
gc_vertidx
gc_errorx: the x coordinate of the self-intersection.
gc_errory: the y coordinate of the self-intersection.
gc_error
gc_segment_1: the index of the first segment involved in the intersection.
gc_segment_2: the index of the second segment involved in the intersection.

Self-intersecting features

OUTPUT

[vector: line, polygon]

Output polygon or line layer with features containing the self-intersecting features. If no self-intersecting features are found, the output layer will be empty. Available fields are the same as in the ERRORS output.

Python code

Algorithm ID: native:checkgeometryselfintersection

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.

24.1.3.10. Small angles 

Compares the angles within line or polygon geometries to a specified threshold, and reports as error any angle below that value.

../../../../_images/check_geometry_angle.png — Fig. 24.7 Reporting errors on a line feature for angles lower than 15°.

See also

Delete small angles

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line, polygon]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Minimum angle	`MIN_ANGLE`	[numeric: double]	Allowed minimum angle between adjacent segments in a feature’s geometry. Any angle below this threshold is reported as error.
Small angle errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing the errors location. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label	Name	Type	Description
Small angle errors	`ERRORS`	[vector: point]	Output point layer representing the error locations and information (the ID and name of the input layer, the ID, geometry part, ring and vertex index of the erroneous feature, x and y coordinates of the error and the value of the erroneous angle).

Python code

Algorithm ID: native:checkgeometryangle

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.

24.1.3.11. Small segments 

Calculates length of individual segments in line or polygon geometries, and reports segments shorter than a minimum length as errors.

../../../../_images/check_geometry_smallsegments.png — Fig. 24.8 Reporting errors (in red) on single line segments shorter than the given threshold.

See also

Delete features

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	`INPUT`	[vector: line, polygon]	Layer with the geometries to check.
Unique feature identifier	`UNIQUE_ID`	[tablefield: any]	Field storing unique values for feature identification.
Minimum segment length	`MIN_SEGMENT_LENGTH`	[numeric: double] Default: 0.0	Minimum length of segments to be considered valid, in map units.
Short segments errors	`ERRORS`	[vector: point] Default: `[Create temporary layer]`	Specification of the output layer containing centroid of short segments. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.
Short segments features Optional	`OUTPUT`	[vector: same as input] Default: `[Skip output]`	Specification of the output layer for features containing short segments. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) Save to File… Save to Geopackage… Save to Database Table… The file encoding can also be changed here.

Advanced parameters

Label

Name

Type

Description

Tolerance

TOLERANCE

[numeric: integer]

Default: 8

Numerical precision of geometric operations, given as an integer n, meaning that two vertices less than 10^-n apart (in map units) are considered to be merged.

Outputs

Label

Name

Type

Description

Short segments errors

ERRORS

[vector: point]

Output point layer representing the error locations and information. Other than the UNIQUE_ID field, the output layer also contains the following fields:

gc_layerid: the ID of the input layer.
gc_layername: the name of the input layer.
gc_partidx: the index of the feature’s geometry part containing the small segment.
gc_ringidx: the index of the feature’s geometry ring containing the small segment.
gc_vertidx: the index of the end vertex of the small segment in the input geometry.
gc_errorx: the x coordinate of the centroid of the small segment.
gc_errory: the y coordinate of the centroid of the small segment.
gc_error: the error segment length.

Short segments features

OUTPUT

[vector: same as input]

Output layer containing, for each identified short segment, the feature it belongs to. Additional fields are available (see ERRORS output).

Python code

Algorithm ID: native:checkgeometrysegmentlength

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.