Network analysis

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, eg 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).

Paramètres

Label Name Type Description
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 seconds) for the Fastest path.

Direction field

Optional

DIRECTION_FIELD

[tablefield: string]

Default: None

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

Optional

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]

Default: None

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)

Optional

DEFAULT_SPEED

[number]

Default: 50

Value to use to calculate the travel time if no speed field is provided for an edge

Topology tolerance

Optional

TOLERANCE

[number]

Default: 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.
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)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

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)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

The file encoding can also be changed here.

Outputs

Label Name Type Description
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.

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, eg 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).

Paramètres

Label Name Type Description
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 seconds) for the Fastest path.

Direction field

Optional

DIRECTION_FIELD

[tablefield: string]

Default: None

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

Optional

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]

Default: None

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)

Optional

DEFAULT_SPEED

[number]

Default: 50

Value to use to calculate the travel time if no speed field is provided for an edge

Topology tolerance

Optional

TOLERANCE

[number]

Default: 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.
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)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

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)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

The file encoding can also be changed here.

Outputs

Label Name Type Description
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.

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.

Paramètres

Label Name Type Description
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

Direction field

Optional

DIRECTION_FIELD

[tablefield: string]

Default: None

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

Optional

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]

Default: None

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)

Optional

DEFAULT_SPEED

[number]

Default: 50

Value to use to calculate the travel time if no speed field is provided for an edge

Topology tolerance

Optional

TOLERANCE

[number]

Default: 0

Two lines with nodes closer than the specified tolerance are considered connected
Shortest path OUTPUT [vector: line]

Specify the output line layer for the shortest paths. One of:

  • Skip output
  • Create Temporary Layer (TEMPORARY_OUTPUT)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

The file encoding can also be changed here.

Outputs

Label Name Type Description
Shortest path OUTPUT [vector: line] Line layer of the shortest or fastest path from each of the start points to the end point

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.

Paramètres

Label Name Type Description
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

Direction field

Optional

DIRECTION_FIELD

[tablefield: string]

Default: None

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

Optional

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]

Default: None

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)

Optional

DEFAULT_SPEED

[number]

Default: 50

Value to use to calculate the travel time if no speed field is provided for an edge

Topology tolerance

Optional

TOLERANCE

[number]

Default: 0

Two lines with nodes closer than the specified tolerance are considered connected
Shortest path OUTPUT [vector: line]

Specify the output line layer for the shortest paths. One of:

  • Create Temporary Layer (TEMPORARY_OUTPUT)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

The file encoding can also be changed here.

Outputs

Label Name Type Description
Shortest path OUTPUT [vector: line] Line layer of the shortest or fastest path from each of the start points to the end point

Shortest path (point to point)

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

Paramètres

Label Name Type Description
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

Direction field

Optional

DIRECTION_FIELD

[tablefield: string]

Default: None

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

Optional

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]

Default: None

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)

Optional

DEFAULT_SPEED

[number]

Default: 50

Value to use to calculate the travel time if no speed field is provided for an edge

Topology tolerance

Optional

TOLERANCE

[number]

Default: 0

Two lines with nodes closer than the specified tolerance are considered connected
Shortest path OUTPUT [vector: line]

Specify the output line layer for the shortest paths. One of:

  • Create Temporary Layer (TEMPORARY_OUTPUT)
  • Save to File…
  • Save to Geopackage…
  • Save to PostGIS Table

The file encoding can also be changed here.

Outputs

Label Name Type Description
Shortest path OUTPUT [vector: line] Line layer of the shortest or fastest path from each of the start point to the end point