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24.1.10. Tinklo analizė
24.1.10.1. Aptarnavimo plotas (pagal sluoksnį)
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).
Parametrai
Baziniai parametrai
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Vektorinis sluoksnis reprezentuojantis tinklą |
|
[vektorius: linija] |
Linijų vektorinis sluoksnis, reprezentuojantis padengiamą tinklą |
Vektorinis sluoksnis su pradžios taškais |
|
[vektorius: taškas] |
Taškų vektorinis sluoksnis, kurio geoobjektai turi būti naudojami kaip pradžios taškai kuriant aptarnavimo zonas |
Skaičiuojamo kelio tipas |
|
[sąrašas] Numatytas: 0 |
Skaičiuojamo kelio tipas. Vienas iš:
|
Kelionės kaina (atstumas „Trumpiausiam“, laikas „Greičiausiam“) |
|
[numeric: double] Default: 0.0 |
Reikšmė vertinama kaip atstumas (tinklo sluoksnio vienetais) kai ieškoma „Trumpiausio“ kelio ir kaip laikas (valandomis), kai ieškoma „Greičiausio“ kelio. |
Service area (lines) |
|
[vektorius: linija] Numatytas: |
Specify the output line layer for the service area. One of:
Šia taipogi galima pakeisti failo koduotę. |
Service area (boundary nodes) |
|
[vektorius: taškas] Numatytas: |
Specify the output point layer for the service area boundary nodes. One of:
Šia taipogi galima pakeisti failo koduotę. |
Non-routable features |
|
[vektorius: taškas] Numatytas: |
Specify the output which will be used to store any input features which could not be routed (e.g., those which are too far from the network layer). One of:
Šia taipogi galima pakeisti failo koduotę. |
Advanced parameters
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Direction field Pasirinktinis |
|
[tablefield: any] |
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 Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[sąrašas] 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 Pasirinktinis |
|
[tablefield: numeric] |
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) |
|
[numeric: double] Default: 50.0 |
Value to use to calculate the travel time if no speed value is provided for an edge in the specified field |
Topology tolerance |
|
[numeric: double] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Include upper/lower bound points |
|
[boolean] Numatytas: ne |
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. |
Maximum point distance from network Pasirinktinis |
|
[numeric: double] Numatytas: jokio |
Specifies an optional limit on the distance from the points to the network layer. If a point is further from the network than this distance it will be treated as non-routable. If not set, endpoints will be snapped to the nearest point on the network layer, regardless of how far away from the network they actually are. |
Išvestys
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Service area (boundary nodes) |
|
[vektorius: taškas] |
The output point layer with the service area boundary nodes. |
Service area (lines) |
|
[vektorius: linija] |
Line layer representing the parts of the network that can be serviced by the start points, for the given cost. |
Non routable features |
|
[vektorius: taškas] |
An optional output which will be used to store any input features which could not be routed (e.g., those which are too far from the network layer). |
Pythono kodas
Algorithm ID: qgis:serviceareafromlayer
import processing
processing.run("algorithm_id", {parameter_dictionary})
algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.
24.1.10.2. 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).
Parametrai
Baziniai parametrai
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Vector layer representing the network |
|
[vektorius: linija] |
Linijų vektorinis sluoksnis, reprezentuojantis padengiamą tinklą |
Skaičiuojamo kelio tipas |
|
[sąrašas] Numatytas: 0 |
Skaičiuojamo kelio tipas. Vienas iš:
|
Start point |
|
[coordinates] |
Coordinate of the point to calculate the service area around. Press the … button next to the option and click on the canvas to fill the parameter with the clicked point coordinate. |
Kelionės kaina (atstumas „Trumpiausiam“, laikas „Greičiausiam“) |
|
[numeric: double] Default: 0.O |
Reikšmė vertinama kaip atstumas (tinklo sluoksnio vienetais) kai ieškoma „Trumpiausio“ kelio ir kaip laikas (valandomis), kai ieškoma „Greičiausio“ kelio. |
Service area (lines) Pasirinktinis |
|
[vektorius: linija] Numatytas: |
Specify the output line layer for the service area. One of:
Šia taipogi galima pakeisti failo koduotę. |
Service area (boundary nodes) Pasirinktinis |
|
[vektorius: taškas] Numatytas: |
Specify the output point layer for the service area boundary nodes. One of:
Šia taipogi galima pakeisti failo koduotę. |
Advanced parameters
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Direction field Pasirinktinis |
|
[tablefield: any] |
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 Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[sąrašas] 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 Pasirinktinis |
|
[tablefield: numeric] |
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) |
|
[numeric: double] Default: 50.0 |
Value to use to calculate the travel time if no speed value is provided for an edge in the specified field |
Topology tolerance |
|
[numeric: double] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Maximum point distance from network Pasirinktinis |
|
[numeric: double] Default: 0.0 |
Specifies an optional limit on the distance from the start point to the network layer. If the point is further from the network than this distance an error will be raised. If not set, the point will be snapped to the nearest point on the network layer, regardless of how far away from the network it actually is. |
Include upper/lower bound points |
|
[boolean] Numatytas: ne |
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. |
Išvestys
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Service area (boundary nodes) |
|
[vektorius: taškas] |
The output point layer with the service area boundary nodes. |
Service area (lines) |
|
[vektorius: linija] |
Line layer representing the parts of the network that can be serviced by the start point, for the given cost. |
Pythono kodas
Algorithm ID: native:serviceareafrompoint
import processing
processing.run("algorithm_id", {parameter_dictionary})
algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.
24.1.10.3. 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.
Parametrai
Baziniai parametrai
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Vektorinis sluoksnis reprezentuojantis tinklą |
|
[vektorius: linija] |
Linijų vektorinis sluoksnis, reprezentuojantis padengiamą tinklą |
Skaičiuojamo kelio tipas |
|
[sąrašas] Numatytas: 0 |
Skaičiuojamo kelio tipas. Vienas iš:
|
Vektorinis sluoksnis su pradžios taškais |
|
[vektorius: taškas] |
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 Press the … button next to the option and click on the canvas to fill the parameter with the clicked point coordinate. |
Shortest path |
|
[vektorius: linija] Numatytas: |
Specify the output line layer for the shortest paths. One of:
Šia taipogi galima pakeisti failo koduotę. |
Non-routable features Pasirinktinis |
|
[vektorius: taškas] Numatytas: |
Specify the output which will be used to store any input features which could not be routed (e.g., those which are too far from the network layer). One of:
Šia taipogi galima pakeisti failo koduotę. |
Advanced parameters
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Direction field Pasirinktinis |
|
[tablefield: any] |
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 Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[sąrašas] 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 Pasirinktinis |
|
[tablefield: numeric] |
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) |
|
[numeric: double] Default: 50.0 |
Value to use to calculate the travel time if no speed value is provided for an edge in the specified field |
Topology tolerance |
|
[numeric: double] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Maximum point distance from network Pasirinktinis |
|
[numeric: double] Numatytas: jokio |
Specifies an optional limit on the distance from the start and end points to the network layer. If a start feature is further from the network than this distance it will be treated as non-routable. If the end point is further from the network than this distance an error will be raised. If not set, points will be snapped to the nearest point on the network layer, regardless of how far away from the network they actually are. |
Išvestys
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Shortest path |
|
[vektorius: linija] |
Line layer of the shortest or fastest path from each of the start points to the end point |
Non routable features |
|
[vektorius: taškas] |
An optional output layer which will be used to store any input features which could not be routed (e.g., those which are too far from the network layer). |
Pythono kodas
Algorithm ID: native:shortestpathlayertopoint
import processing
processing.run("algorithm_id", {parameter_dictionary})
algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.
24.1.10.4. 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.
Įspėjimas
This algorithm drops existing primary keys or FID values and regenerates them in output layers.
Parametrai
Baziniai parametrai
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Vektorinis sluoksnis reprezentuojantis tinklą |
|
[vektorius: linija] |
Linijų vektorinis sluoksnis, reprezentuojantis padengiamą tinklą |
Skaičiuojamo kelio tipas |
|
[sąrašas] Numatytas: 0 |
Skaičiuojamo kelio tipas. Vienas iš:
|
Start point |
|
[coordinates] |
Point feature representing the start point of the routes Press the … button next to the option and click on the canvas to fill the parameter with the clicked point coordinate. |
Vector layer with end points |
|
[vektorius: taškas] |
Point vector layer whose features are used as end points of the routes |
Shortest path |
|
[vektorius: linija] Numatytas: |
Specify the output line layer for the shortest paths. One of:
Šia taipogi galima pakeisti failo koduotę. |
Non-routable features |
Pasirinktinis |
[vektorius: taškas] Numatytas: |
Specify the output which will be used to store any input features which could not be routed (e.g., those which are too far from the network layer). One of:
Šia taipogi galima pakeisti failo koduotę. |
Advanced parameters
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Direction field Pasirinktinis |
|
[tablefield: any] |
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 Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[sąrašas] 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 Pasirinktinis |
|
[tablefield: numeric] |
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) |
|
[numeric: double] Default: 50.0 |
Value to use to calculate the travel time if no speed value is provided for an edge in the specified field |
Topology tolerance |
|
[numeric: double] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Maximum point distance from network Pasirinktinis |
|
[numeric: double] Numatytas: jokio |
Specifies an optional limit on the distance from the start and end points to the network layer. If the start point is further from the network than this distance an error will be raised. If an end feature is further from the network than this distance it will be treated as non-routable. If not set, points will be snapped to the nearest point on the network layer, regardless of how far away from the network they actually are. |
Išvestys
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Shortest path |
|
[vektorius: linija] |
Line layer of the shortest or fastest path from each of the start points to the end point |
Non routable features |
|
[vektorius: taškas] |
An optional output layer which will be used to store any input features which could not be routed (e.g., those which are too far from the network layer). |
Pythono kodas
Algorithm ID: native:shortestpathpointtolayer
import processing
processing.run("algorithm_id", {parameter_dictionary})
algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.
24.1.10.5. Shortest path (point to point)
Computes the optimal (shortest or fastest) route between a given start point and a given end point.
Parametrai
Baziniai parametrai
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Vektorinis sluoksnis reprezentuojantis tinklą |
|
[vektorius: linija] |
Linijų vektorinis sluoksnis, reprezentuojantis padengiamą tinklą |
Skaičiuojamo kelio tipas |
|
[sąrašas] Numatytas: 0 |
Skaičiuojamo kelio tipas. Vienas iš:
|
Start point (x, y) |
|
[coordinates] |
Point feature representing the start point of the routes. Press the … button next to the option and click on the canvas to fill the parameter with the clicked point coordinate. |
End point (x, y) |
|
[coordinates] |
Point feature representing the end point of the routes. Press the … button next to the option and click on the canvas to fill the parameter with the clicked point coordinate. |
Shortest path |
|
[vektorius: linija] |
Specify the output line layer for the shortest paths. One of:
Šia taipogi galima pakeisti failo koduotę. |
Advanced parameters
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Direction field Pasirinktinis |
|
[tablefield: any] |
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 Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a forward direction |
Value for backward direction Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify edges with a backward direction |
Value for both directions Pasirinktinis |
|
[string] Default: ‚‘ (empty string) |
Value set in the direction field to identify bidirectional edges |
Default direction |
|
[sąrašas] 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 Pasirinktinis |
|
[tablefield: numeric] |
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) |
|
[numeric: double] Default: 50.0 |
Value to use to calculate the travel time if no speed value is provided for an edge in the specified field |
Topology tolerance |
|
[numeric: double] Default: 0.0 |
Two lines with nodes closer than the specified tolerance are considered connected |
Maximum point distance from network Pasirinktinis |
|
[numeric: double] Numatytas: jokio |
Specifies an optional limit on the distance from the start and end points to the network layer. If either point is further from the network than this distance an error will be raised. If not set, points will be snapped to the nearest point on the network layer, regardless of how far away from the network they actually are. |
Išvestys
Užrašas |
Pavadinimas |
Tipas |
Aprašymas |
|---|---|---|---|
Shortest path |
|
[vektorius: linija] |
Line layer of the shortest or fastest path from each of the start point to the end point |
Pythono kodas
Algorithm ID: native:shortestpathpointtopoint
import processing
processing.run("algorithm_id", {parameter_dictionary})
algoritmo id rodomas, kai užvedate pelę virš algoritmo apdorojimo įrankinėje. parametrų žodynas teikia parametrų pavadinimus ir reikšmes. Daugiau informacijos apie tai, kaip vykdyti apdorojimo algoritmus Pythono konsolėje rasite skyriuje Using processing algorithms from the console.