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28.1.10. Network analysis

28.1.10.1. Service area (from layer)

Returns all the edges or parts of edges of a network that can be reached within a distance or a time, starting from a point layer. This allows evaluation of accessibility within a network, e.g. what are the places I can navigate to on a road network without spending cost greater than a given value (the cost can be distance or time).

Parameter

Basic parameters

Bezeichnung	Name	Typ	Beschreibung
Vector layer representing network	`INPUT`	[vector: line]	Line vector layer representing the network to be covered
Vector layer with start points	`START_POINTS`	[vector: point]	Point vector layer whose features are used as start points to generate the service areas
Path type to calculate	`STRATEGY`	[enumeration] Default: 0	The type of path to calculate. One of: 0 — Shortest 1 — Fastest
Travel cost (distance for „Shortest“, time for „Fastest“)	`TRAVEL_COST`	[number] Default: 0	The value is estimated as a distance (in the network layer units) when looking for the Shortest path and as time (in hours) for the Fastest path.
Service area (lines)	`OUTPUT_LINES`	[vector: line] Default: `[Create temporary layer]`	Specify the output line layer for the service area. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.
Service area (boundary nodes)	`OUTPUT`	[vector: point] Default: `[Skip output]`	Specify the output point layer for the service area boundary nodes. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.

Fortgeschrittene Parameter

Bezeichnung	Name	Typ	Beschreibung
Direction field Optional	`DIRECTION_FIELD`	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters `Value for forward direction`, `Value for backward direction` and `Value for both directions`. Forward and reverse directions correspond to a one-way edge, „both directions“ indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the `Default direction` parameter) is used.
Value for forward direction Optional	`VALUE_FORWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Optional	`VALUE_BACKWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Optional	`VALUE_BOTH`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify bidirectional edges
Default direction	`DEFAULT_DIRECTION`	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Optional	`SPEED_FIELD`	[tablefield: string]	Field providing the speed value (in `km/h`) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the `Default speed` parameter) is used.
Default speed (km/h)	`DEFAULT_SPEED`	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance	`TOLERANCE`	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

Include upper/lower bound points

INCLUDE_BOUNDS

[boolean]

Default: False

Creates a point layer output with two points for each edge at the boundaries of the service area. One point is the start of that edge, the other is the end.

Ausgaben

Bezeichnung	Name	Typ	Beschreibung
Service area (boundary nodes)	`OUTPUT`	[vector: point]	The output point layer with the service area boundary nodes.
Service area (lines)	`OUTPUT_LINES`	[vector: line]	Line layer representing the parts of the network that can be serviced by the start points, for the given cost.

Pythoncode

Algorithm ID: qgis:serviceareafromlayer

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 Verarbeitungs-Algorithmen von der Konsole aus verwenden for details on how to run processing algorithms from the Python console.

28.1.10.2. Service area (from point)

Returns all the edges or parts of edges of a network that can be reached within a given distance or time, starting from a point feature. This allows the evaluation of accessibility within a network, e.g. what are the places I can navigate to on a road network without spending a cost greater than a given value (the cost can be distance or time).

Parameter

Basic parameters

Bezeichnung	Name	Typ	Beschreibung
Vector layer representing the network	`INPUT`	[vector: line]	Line vector layer representing the network to be covered
Start point (x, y)	`START_POINT`	[coordinates]	Coordinate of the point to calculate the service area around.
Path type to calculate	`STRATEGY`	[enumeration] Default: 0	The type of path to calculate. One of: 0 — Shortest 1 — Fastest
Travel cost (distance for „Shortest“, time for „Fastest“)	`TRAVEL_COST`	[number] Default: 0	The value is estimated as a distance (in the network layer units) when looking for the Shortest path and as time (in hours) for the Fastest path.
Service area (lines)	`OUTPUT_LINES`	[vector: line] Default: `[Create temporary layer]`	Specify the output line layer for the service area. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.
Service area (boundary nodes)	`OUTPUT`	[vector: point] Default: `[Skip output]`	Specify the output point layer for the service area boundary nodes. One of: Skip Output Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.

Fortgeschrittene Parameter

Bezeichnung	Name	Typ	Beschreibung
Direction field Optional	`DIRECTION_FIELD`	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters `Value for forward direction`, `Value for backward direction` and `Value for both directions`. Forward and reverse directions correspond to a one-way edge, „both directions“ indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the `Default direction` parameter) is used.
Value for forward direction Optional	`VALUE_FORWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Optional	`VALUE_BACKWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Optional	`VALUE_BOTH`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify bidirectional edges
Default direction	`DEFAULT_DIRECTION`	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Optional	`SPEED_FIELD`	[tablefield: string]	Field providing the speed value (in `km/h`) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the `Default speed` parameter) is used.
Default speed (km/h)	`DEFAULT_SPEED`	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance	`TOLERANCE`	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

Include upper/lower bound points

INCLUDE_BOUNDS

[boolean]

Default: False

Creates a point layer output with two points for each edge at the boundaries of the service area. One point is the start of that edge, the other is the end.

Ausgaben

Bezeichnung	Name	Typ	Beschreibung
Service area (boundary nodes)	`OUTPUT`	[vector: point]	The output point layer with the service area boundary nodes.
Service area (lines)	`OUTPUT_LINES`	[vector: line]	Line layer representing the parts of the network that can be serviced by the start point, for the given cost.

Pythoncode

Algorithm ID: native:serviceareafrompoint

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 Verarbeitungs-Algorithmen von der Konsole aus verwenden for details on how to run processing algorithms from the Python console.

28.1.10.3. Shortest path (layer to point)

Computes the optimal (shortest or fastest) routes from multiple start points defined by a vector layer and a given end point.

Parameter

Basic parameters

Bezeichnung	Name	Typ	Beschreibung
Vector layer representing network	`INPUT`	[vector: line]	Line vector layer representing the network to be covered
Path type to calculate	`STRATEGY`	[enumeration] Default: 0	The type of path to calculate. One of: 0 — Shortest 1 — Fastest
Vector layer with start points	`START_POINTS`	[vector: point]	Point vector layer whose features are used as start points of the routes
End point (x, y)	`END_POINT`	[coordinates]	Point feature representing the end point of the routes
Shortest path	`OUTPUT`	[vector: line]	Specify the output line layer for the shortest paths. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.

Fortgeschrittene Parameter

Bezeichnung	Name	Typ	Beschreibung
Direction field Optional	`DIRECTION_FIELD`	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters `Value for forward direction`, `Value for backward direction` and `Value for both directions`. Forward and reverse directions correspond to a one-way edge, „both directions“ indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the `Default direction` parameter) is used.
Value for forward direction Optional	`VALUE_FORWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Optional	`VALUE_BACKWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Optional	`VALUE_BOTH`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify bidirectional edges
Default direction	`DEFAULT_DIRECTION`	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Optional	`SPEED_FIELD`	[tablefield: string]	Field providing the speed value (in `km/h`) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the `Default speed` parameter) is used.
Default speed (km/h)	`DEFAULT_SPEED`	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance	`TOLERANCE`	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

Ausgaben

Bezeichnung	Name	Typ	Beschreibung
Shortest path	`OUTPUT`	[vector: line]	Line layer of the shortest or fastest path from each of the start points to the end point

Pythoncode

Algorithm ID: native:shortestpathlayertopoint

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 Verarbeitungs-Algorithmen von der Konsole aus verwenden for details on how to run processing algorithms from the Python console.

28.1.10.4. Shortest path (point to layer)

Computes the optimal (shortest or fastest) routes between a given start point and multiple end points defined by a point vector layer.

Parameter

Basic parameters

Bezeichnung	Name	Typ	Beschreibung
Vector layer representing network	`INPUT`	[vector: line]	Line vector layer representing the network to be covered
Path type to calculate	`STRATEGY`	[enumeration] Default: 0	The type of path to calculate. One of: 0 — Shortest 1 — Fastest
Start point (x, y)	`START_POINT`	[coordinates]	Point feature representing the start point of the routes
Vector layer with end points	`END_POINTS`	[vector: point]	Point vector layer whose features are used as end points of the routes
Shortest path	`OUTPUT`	[vector: line]	Specify the output line layer for the shortest paths. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.

Fortgeschrittene Parameter

Bezeichnung	Name	Typ	Beschreibung
Direction field Optional	`DIRECTION_FIELD`	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters `Value for forward direction`, `Value for backward direction` and `Value for both directions`. Forward and reverse directions correspond to a one-way edge, „both directions“ indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the `Default direction` parameter) is used.
Value for forward direction Optional	`VALUE_FORWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Optional	`VALUE_BACKWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Optional	`VALUE_BOTH`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify bidirectional edges
Default direction	`DEFAULT_DIRECTION`	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Optional	`SPEED_FIELD`	[tablefield: string]	Field providing the speed value (in `km/h`) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the `Default speed` parameter) is used.
Default speed (km/h)	`DEFAULT_SPEED`	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance	`TOLERANCE`	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

Ausgaben

Bezeichnung	Name	Typ	Beschreibung
Shortest path	`OUTPUT`	[vector: line]	Line layer of the shortest or fastest path from each of the start points to the end point

Pythoncode

Algorithm ID: native:shortestpathpointtolayer

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 Verarbeitungs-Algorithmen von der Konsole aus verwenden for details on how to run processing algorithms from the Python console.

28.1.10.5. Shortest path (point to point)

Computes the optimal (shortest or fastest) route between a given start point and a given end point.

Parameter

Basic parameters

Bezeichnung	Name	Typ	Beschreibung
Vector layer representing network	`INPUT`	[vector: line]	Line vector layer representing the network to be covered
Path type to calculate	`STRATEGY`	[enumeration] Default: 0	The type of path to calculate. One of: 0 — Shortest 1 — Fastest
Start point (x, y)	`START_POINT`	[coordinates]	Point feature representing the start point of the routes
End point (x, y)	`END_POINT`	[coordinates]	Point feature representing the end point of the routes
Shortest path	`OUTPUT`	[vector: line]	Specify the output line layer for the shortest paths. One of: Create Temporary Layer (`TEMPORARY_OUTPUT`) In Datei speichern… In GeoPackage speichern… In Datenbank speichern… The file encoding can also be changed here.

Fortgeschrittene Parameter

Bezeichnung	Name	Typ	Beschreibung
Direction field Optional	`DIRECTION_FIELD`	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters `Value for forward direction`, `Value for backward direction` and `Value for both directions`. Forward and reverse directions correspond to a one-way edge, „both directions“ indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the `Default direction` parameter) is used.
Value for forward direction Optional	`VALUE_FORWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Optional	`VALUE_BACKWARD`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Optional	`VALUE_BOTH`	[string] Default: ‚‘ (empty string)	Value set in the direction field to identify bidirectional edges
Default direction	`DEFAULT_DIRECTION`	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Optional	`SPEED_FIELD`	[tablefield: string]	Field providing the speed value (in `km/h`) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the `Default speed` parameter) is used.
Default speed (km/h)	`DEFAULT_SPEED`	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance	`TOLERANCE`	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

Ausgaben

Bezeichnung	Name	Typ	Beschreibung
Shortest path	`OUTPUT`	[vector: line]	Line layer of the shortest or fastest path from each of the start point to the end point

Pythoncode

Algorithm ID: native:shortestpathpointtopoint

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 Verarbeitungs-Algorithmen von der Konsole aus verwenden for details on how to run processing algorithms from the Python console.