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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).
Paraméterek
Alapvető paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Vector layer representing network |
|
[vector: line] |
Line vector layer representing the network to be covered |
Vector layer with start points |
|
[vector: point] |
Point vector layer whose features are used as start points to generate the service areas |
Path type to calculate |
|
[felsorolás] Alapértelmezett: 0 |
The type of path to calculate. One of:
|
Travel cost (distance for „Shortest”, time for „Fastest”) |
|
[szám] Alapértelmezett: 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) |
|
[vector: line] Default: |
Specify the output line layer for the service area. One of:
The file encoding can also be changed here. |
Service area (boundary nodes) |
|
[vector: point] Default: |
Specify the output point layer for the service area boundary nodes. One of:
The file encoding can also be changed here. |
Speciális paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Direction field Optional |
|
[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 Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[felsorolás] 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:
|
Speed field Optional |
|
[tablefield: string] |
Field providing the speed value (in 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 (km/h) |
|
[szám] Default: 50.0 |
Value to use to calculate the travel time if no speed field is provided for an edge |
Topology tolerance |
|
[szám] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Include upper/lower bound points |
|
[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. |
Eredmények
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Service area (boundary nodes) |
|
[vector: point] |
The output point layer with the service area boundary nodes. |
Service area (lines) |
|
[vector: line] |
Line layer representing the parts of the network that can be serviced by the start points, for the given cost. |
Python kód
Algorithm ID: qgis:serviceareafromlayer
import processing
processing.run("algorithm_id", {parameter_dictionary})
Az algoritmus azonosító akkor jelenik meg, ha az egérmutatót az algoritmus fölé viszi a Feldolgozás eszköztáron. A paraméterszótár tartalmazza a paraméter NAME-eket és érékeket. A feldolgozási algoritmusok Python konzolról történő futtatásával kapcsolatos részletekért lásd a Using processing algorithms from the console fejezetet.
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).
Paraméterek
Alapvető paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Vector layer representing the network |
|
[vector: line] |
Line vector layer representing the network to be covered |
Start point (x, y) |
|
[coordinates] |
Coordinate of the point to calculate the service area around. |
Path type to calculate |
|
[felsorolás] Alapértelmezett: 0 |
The type of path to calculate. One of:
|
Travel cost (distance for „Shortest”, time for „Fastest”) |
|
[szám] Alapértelmezett: 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) |
|
[vector: line] Default: |
Specify the output line layer for the service area. One of:
The file encoding can also be changed here. |
Service area (boundary nodes) |
|
[vector: point] Default: |
Specify the output point layer for the service area boundary nodes. One of:
The file encoding can also be changed here. |
Speciális paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Direction field Optional |
|
[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 Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[felsorolás] 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:
|
Speed field Optional |
|
[tablefield: string] |
Field providing the speed value (in 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 (km/h) |
|
[szám] Default: 50.0 |
Value to use to calculate the travel time if no speed field is provided for an edge |
Topology tolerance |
|
[szám] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Include upper/lower bound points |
|
[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. |
Eredmények
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Service area (boundary nodes) |
|
[vector: point] |
The output point layer with the service area boundary nodes. |
Service area (lines) |
|
[vector: line] |
Line layer representing the parts of the network that can be serviced by the start point, for the given cost. |
Python kód
Algorithm ID: native:serviceareafrompoint
import processing
processing.run("algorithm_id", {parameter_dictionary})
Az algoritmus azonosító akkor jelenik meg, ha az egérmutatót az algoritmus fölé viszi a Feldolgozás eszköztáron. A paraméterszótár tartalmazza a paraméter NAME-eket és érékeket. A feldolgozási algoritmusok Python konzolról történő futtatásával kapcsolatos részletekért lásd a Using processing algorithms from the console fejezetet.
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.
Paraméterek
Alapvető paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Vector layer representing network |
|
[vector: line] |
Line vector layer representing the network to be covered |
Path type to calculate |
|
[felsorolás] Alapértelmezett: 0 |
The type of path to calculate. One of:
|
Vector layer with start points |
|
[vector: point] |
Point vector layer whose features are used as start points of the routes |
End point (x, y) |
|
[coordinates] |
Point feature representing the end point of the routes |
Shortest path |
|
[vector: line] |
Specify the output line layer for the shortest paths. One of:
The file encoding can also be changed here. |
Speciális paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Direction field Optional |
|
[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 Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[felsorolás] 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:
|
Speed field Optional |
|
[tablefield: string] |
Field providing the speed value (in 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 (km/h) |
|
[szám] Default: 50.0 |
Value to use to calculate the travel time if no speed field is provided for an edge |
Topology tolerance |
|
[szám] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Eredmények
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Shortest path |
|
[vector: line] |
Line layer of the shortest or fastest path from each of the start points to the end point |
Python kód
Algorithm ID: native:shortestpathlayertopoint
import processing
processing.run("algorithm_id", {parameter_dictionary})
Az algoritmus azonosító akkor jelenik meg, ha az egérmutatót az algoritmus fölé viszi a Feldolgozás eszköztáron. A paraméterszótár tartalmazza a paraméter NAME-eket és érékeket. A feldolgozási algoritmusok Python konzolról történő futtatásával kapcsolatos részletekért lásd a Using processing algorithms from the console fejezetet.
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.
Paraméterek
Alapvető paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Vector layer representing network |
|
[vector: line] |
Line vector layer representing the network to be covered |
Path type to calculate |
|
[felsorolás] Alapértelmezett: 0 |
The type of path to calculate. One of:
|
Start point (x, y) |
|
[coordinates] |
Point feature representing the start point of the routes |
Vector layer with end points |
|
[vector: point] |
Point vector layer whose features are used as end points of the routes |
Shortest path |
|
[vector: line] |
Specify the output line layer for the shortest paths. One of:
The file encoding can also be changed here. |
Speciális paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Direction field Optional |
|
[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 Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[felsorolás] 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:
|
Speed field Optional |
|
[tablefield: string] |
Field providing the speed value (in 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 (km/h) |
|
[szám] Default: 50.0 |
Value to use to calculate the travel time if no speed field is provided for an edge |
Topology tolerance |
|
[szám] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Eredmények
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Shortest path |
|
[vector: line] |
Line layer of the shortest or fastest path from each of the start points to the end point |
Python kód
Algorithm ID: native:shortestpathpointtolayer
import processing
processing.run("algorithm_id", {parameter_dictionary})
Az algoritmus azonosító akkor jelenik meg, ha az egérmutatót az algoritmus fölé viszi a Feldolgozás eszköztáron. A paraméterszótár tartalmazza a paraméter NAME-eket és érékeket. A feldolgozási algoritmusok Python konzolról történő futtatásával kapcsolatos részletekért lásd a Using processing algorithms from the console fejezetet.
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.
Paraméterek
Alapvető paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Vector layer representing network |
|
[vector: line] |
Line vector layer representing the network to be covered |
Path type to calculate |
|
[felsorolás] Alapértelmezett: 0 |
The type of path to calculate. One of:
|
Start point (x, y) |
|
[coordinates] |
Point feature representing the start point of the routes |
End point (x, y) |
|
[coordinates] |
Point feature representing the end point of the routes |
Shortest path |
|
[vector: line] |
Specify the output line layer for the shortest paths. One of:
The file encoding can also be changed here. |
Speciális paraméterek
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Direction field Optional |
|
[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 Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Optional |
|
[karakterlánc] Default: «» (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[felsorolás] 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:
|
Speed field Optional |
|
[tablefield: string] |
Field providing the speed value (in 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 (km/h) |
|
[szám] Default: 50.0 |
Value to use to calculate the travel time if no speed field is provided for an edge |
Topology tolerance |
|
[szám] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Eredmények
Címke |
Név |
Típus |
Leírás |
---|---|---|---|
Shortest path |
|
[vector: line] |
Line layer of the shortest or fastest path from each of the start point to the end point |
Python kód
Algorithm ID: native:shortestpathpointtopoint
import processing
processing.run("algorithm_id", {parameter_dictionary})
Az algoritmus azonosító akkor jelenik meg, ha az egérmutatót az algoritmus fölé viszi a Feldolgozás eszköztáron. A paraméterszótár tartalmazza a paraméter NAME-eket és érékeket. A feldolgozási algoritmusok Python konzolról történő futtatásával kapcsolatos részletekért lásd a Using processing algorithms from the console fejezetet.