24.1.6. Fix Geometry

24.1.6.1. Delete duplicated vertices

Deletes duplicated vertices from the input geometries.

See also

Duplicated vertices, Remove duplicate vertices

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	INPUT	[vector: line, polygon]	Layer with the geometries to fix, same as input in the check algorithm.
Error layer	ERRORS	[vector: point]	Point layer with the errors location, generated by the check algorithm.
Field of original feature unique identifier	UNIQUE_ID	[tablefield: any]	Field storing unique values for feature identification in input layer, as set in the check algorithm.
Field of part index	PART_IDX	[tablefield: integer] Default: gc_partidx	Field storing the erroneous feature’s geometry part number.
Field of ring index	RING_IDX	[tablefield: integer] Default: gc_ringidx	Field storing the erroneous feature’s geometry ring number.
Field of vertex index	VERTEX_IDX	[tablefield: integer] Default: gc_vertidx	Field storing the erroneous feature’s geometry vertex number.
Fixed duplicate vertices layer	OUTPUT	[vector: same as input] Default: [Create temporary layer]	Specification of the output layer containing fixed 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.
Report layer from fixing duplicate vertices	REPORT	[vector: point] Default: [Create temporary layer]	Specification of the output layer containing the fixes 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
Report layer from fixing duplicate vertices	REPORT	[vector: point]	Output point layer representing the error locations and fix applied. 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: the index of the duplicate vertex in the feature. gc_errorx: the x coordinate of the duplicate vertex. gc_errory: the y coordinate of the duplicate vertex. gc_error report: a text field describing the fix applied. error_fixed: a boolean field indicating whether the error was fixed.
Fixed duplicate vertices layer	OUTPUT	[vector: same as input]	Output layer with the geometry fix applied to the input features.

Python code

Algorithm ID: native:fixgeometryduplicatenodes

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.

24.1.6.2. Delete features

Deletes error features based on an error layer from the check geometry algorithms.

Fig. 24.9 Before and after deleting features inside a polygon.

See also

Delete duplicate geometries, Drop geometries

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	INPUT	[vector: geometry]	Layer with the geometries to fix, same as input in the check algorithm.
Error layer	ERRORS	[vector: point]	Point layer with the errors location, generated by the check algorithm.
Field of original feature unique identifier	UNIQUE_ID	[tablefield: any]	Field storing unique values for feature identification in input layer, as set in the check algorithm.
Cleaned layer	OUTPUT	[vector: same as input] Default: [Create temporary layer]	Specification of the output layer containing fixed 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.
Report layer from deleting features	REPORT	[vector: point] Default: [Create temporary layer]	Specification of the output layer containing the fixes 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.

Outputs

Label	Name	Type	Description
Report layer from deleting features	REPORT	[vector: point]	Output point layer representing the error locations and fix applied. 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 erroneous geometry. gc_errory: the y coordinate of the centroid of the erroneous geometry. gc_error: the index of the feature where the error belongs. report: a text field describing the fix applied. error_fixed: a boolean field indicating whether the error was fixed.
Cleaned layer	OUTPUT	[vector: same as input]	Output layer with features removed based on detected errors.

Python code

Algorithm ID: native:fixgeometrydeletefeatures

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.

24.1.6.3. Delete overlaps

Deletes overlapping areas based on an error layer from the check geometry algorithms.

Fig. 24.10 Before and after deleting overlapping areas.

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	INPUT	[vector: polygon]	Layer with the geometries to fix, same as input in the check algorithm.
Error layer	ERRORS	[vector: point]	Point layer with the errors location, generated by the check algorithm.
Field of original feature unique identifier	UNIQUE_ID	[tablefield: any]	Field storing unique values for feature identification in input layer, as set in the check algorithm.
Field of overlap feature unique identifier	OVERLAP_FEATURE_UNIQUE_IDX	[tablefield: any]	Field storing unique values for the overlapping feature identification in input layer, as set in the check algorithm.
Field of error value	ERROR_VALUE_ID	[tablefield: any]	Field storing the error value for each feature, as set in the check algorithm.
No-overlap layer	OUTPUT	[vector: polygon] Default: [Create temporary layer]	Specification of the output layer containing fixed 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.
Report layer from fixing overlaps	REPORT	[vector: point] Default: [Create temporary layer]	Specification of the output layer containing the fixes 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
Report layer from fixing overlaps	REPORT	[vector: point]	Output point layer representing the error locations and fix applied. 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. report: a text field describing the fix applied. error_fixed: a boolean field indicating whether the error was fixed.
No-overlap layer	OUTPUT	[vector: polygon]	Output layer with input features edited. Overlapping areas reported as errors are removed.

Python code

Algorithm ID: native:fixgeometryoverlap

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.

24.1.6.4. Delete small angles

Deletes vertices based on an error layer from the Small angles algorithm. When deletion of a vertex results in a duplicate vertex (when a spike vertex is deleted), the duplicate vertex is deleted to keep a single vertex and preserve topology.

Attention

This algorithm removes the vertex at the reported small angles, generating new segments that may form a new small angle.

Fig. 24.11 Fixing reported errors on a line feature for angles lower than 15°.

See also

Small angles

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	INPUT	[vector: line, polygon]	Layer with the geometries to fix, same as input in the check algorithm
Error layer	ERRORS	[vector: point]	Point layer with the errors location, generated by the check algorithm
Field of original feature unique identifier	UNIQUE_ID	[tablefield: any]	Field storing unique values for feature identification in input layer, as set in the check algorithm
Field of part index	PART_IDX	[tablefield: integer] Default: gc_partidx	Field storing the erroneous feature’s geometry part number.
Field of ring index	RING_IDX	[tablefield: integer] Default: gc_ringidx	Field storing the erroneous feature’s geometry ring number.
Field of vertex index	VERTEX_IDX	[tablefield: integer] Default: gc_vertidx	Field storing the erroneous feature’s geometry vertex number.
Small angle fixed layer	OUTPUT	[vector: same as input] Default: [Create temporary layer]	Specification of the output layer containing fixed 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.
Report layer from fixing small angles	REPORT	[vector: point] Default: [Create temporary layer]	Specification of the output layer containing the fixes 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
Report layer from fixing small angles	REPORT	[vector: point]	Output point layer representing the error locations and fix applied (the ID and name of the input layer, the ID, geometry part, ring and vertex index of the erroneous feature, x and y coordinates and value of the erroneous angle, the applied fix and its successfulness).
Small angle fixed layer	OUTPUT	[same as input]	Output layer with the geometry fix applied to the input features

Python code

Algorithm ID: native:fixgeometryangle

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.

24.1.6.5. Fill holes

Deletes holes in polygon geometries based on an error layer from the Holes algorithm.

Fig. 24.12 Before and after fixing holes in a polygon feature.

See also

Holes, Delete holes

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	INPUT	[vector: line, polygon]	Layer with the geometries to fix, same as input in the check algorithm
Error layer	ERRORS	[vector: point]	Point layer with the errors location, generated by the check algorithm
Field of original feature unique identifier	UNIQUE_ID	[tablefield: any]	Field storing unique values for feature identification in input layer, as set in the check algorithm
Field of part index	PART_IDX	[tablefield: integer] Default: gc_partidx	Field storing the erroneous feature’s geometry part number.
Field of ring index	RING_IDX	[tablefield: integer] Default: gc_ringidx	Field storing the erroneous feature’s geometry ring number.
Field of vertex index	VERTEX_IDX	[tablefield: integer] Default: gc_vertidx	Field storing the erroneous feature’s geometry vertex number.
Holes-filled layer	OUTPUT	[vector: polygon] Default: [Create temporary layer]	Specification of the output layer containing fixed 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.
Report layer from fixing holes	REPORT	[vector: point] Default: [Create temporary layer]	Specification of the output layer containing the fixes 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
Report layer from fixing holes	REPORT	[vector: point]	Output point layer representing the error locations and fix applied (the ID and name of the input layer, the geometry part, ring and vertex index of the erroneous feature, x and y coordinates of the error, the applied fix and its successfulness).
Holes-filled layer	OUTPUT	[vector: polygon]	Output layer of polygons without holes.

Python code

Algorithm ID: native:fixgeometryhole

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.

24.1.6.6. Split self-intersecting geometries

Splits self-intersecting geometries based on an error layer from the Self-intersections algorithm.

Fig. 24.13 Comparison between input layer, multi-object fix, and single-object fix geometries.

See also

Self-intersections

Parameters

Basic parameters

Label	Name	Type	Description
Input layer	INPUT	[vector: line, polygon]	Layer with the geometries to fix, same as input in the check algorithm
Error layer	ERRORS	[vector: point]	Point layer with the errors location, generated by the check algorithm
Method	METHOD	[enumeration]	Method to apply to the self-intersecting geometries: 0 – Split feature into a multi-object feature: splits the self-intersecting geometry into multiple parts stored in a single multipart feature. 1 – Split feature into multiple single-object features: splits the self-intersecting geometry into multiple parts, each part stored in a separate feature.
Field of original feature unique identifier	UNIQUE_ID	[tablefield: any]	Field storing unique values for feature identification in input layer, as set in the check algorithm
Field of part index	PART_IDX	[tablefield: integer] Default: gc_partidx	Field storing the erroneous feature’s geometry part number.
Field of ring index	RING_IDX	[tablefield: integer] Default: gc_ringidx	Field storing the erroneous feature’s geometry ring number.
Field of vertex index	VERTEX_IDX	[tablefield: integer] Default: gc_vertidx	Field storing the erroneous feature’s geometry vertex number.
Field of segment 1	SEGMENT_1	[tablefield: integer] Default: gc_segment_1	Field storing the number of the first segment involved in the erroneous intersection.
Field of segment 2	SEGMENT_2	[tablefield: integer] Default: gc_segment_2	Field storing the number of the second segment involved in the erroneous intersection.
Self-intersections fixed layer	OUTPUT	[vector: same as input] Default: [Create temporary layer]	Specification of the output layer containing fixed 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.
Report layer from fixing self-intersections	REPORT	[vector: point] Default: [Create temporary layer]	Specification of the output layer containing the fixes 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
Report layer from fixing self-intersections	REPORT	[vector: point]	Output point layer representing the error locations and fix applied. 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. report: a text field describing the fix applied. error_fixed: a boolean field indicating whether the error was fixed.
Self-intersections fixed layer	OUTPUT	[vector: same as input]	Output layer with the geometry fix applied to the input features.

Python code

Algorithm ID: native:fixgeometryselfintersection

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.