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Questions tagged [qgis-network-analysis]

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4 votes
2 answers
183 views

Calculate network length covered by service area in QGIS

The resulting MultiLineString features of Service area (from point) and Service area (from layer) in QGIS usually contain several overlapping lines. How can the length of the network covered by the ...
winnewoerp's user avatar
  • 1,504
0 votes
0 answers
41 views

QNEAT3 'Iso-Area as Polygons processing error

I am doing a network analysis on QGIS. Versione di QGIS: 3.28.12-Firenze Revisione codice QGIS: dcc633b2de Versione di Qt: 5.15.3 Versione Python: 3.9.5 Versione di GDAL: 3.7.3 Versione di GEOS: 3.12....
qgislino's user avatar
2 votes
1 answer
173 views

How can I merge two line layers correctly for network analysis in QGIS?

I have a graphical model in QGIS that takes a basic sidewalk network (derived from OpenStreetMap data where separate sidewalks geometry exists) and adds additional crossings automatically. As a last ...
winnewoerp's user avatar
  • 1,504
2 votes
1 answer
121 views

Network analysis (with slopes)

Using the QGIS network analysis (layers) command, I can calculate the maximum areas that a "bus stop" point can serve by determining a distance X. However, I would like this distance to vary ...
Pedro Coelho's user avatar
1 vote
0 answers
59 views

Finding lowest and second lowest values within selection, using expressions QGIS 3.24

I need to calculate the closest and second closest point in one layer, measured from points in another layer. I have used Qgis Network Analysis "OD Matrix as table from layers" which gives ...
Helena's user avatar
  • 81
1 vote
0 answers
134 views

Making shortest path for number of each points with link layer in QGIS

I want to make shortest path for a number of each points with a link layer in QGIS. Now, shortest path tool have to click the start point and end point one by one. But I have 2,000 pairs. So I want to ...
user214014's user avatar
2 votes
1 answer
229 views

Routing along existing road network using QGIS

I just started learning QGIS and PyQGIS. I have one layer of a shapefile that contains a road network (image 1) and one layer of the CSV file (image 2) that contains several start and end points for ...
xz12345zx's user avatar
1 vote
0 answers
70 views

Route direction based on road width?

I have road polyline data that contains a road width field (in meters) and I want to visualize road direction, based on this road width field. The road direction that I mean is kind of like this: (...
leemu's user avatar
  • 21
2 votes
1 answer
790 views

Selection of best site for factory in QGIS

I am stuck trying to determine, where it would be preferable to locate one or more factories according to the data shown below. The criterias for the selection of the site(s) are: There must be 15 ...
MadMagister's user avatar
0 votes
1 answer
541 views

QNEAT3 Shortest Path works but OD Matrix doesn't

I have successfully created a shortest path layer using QNEAT3. When I try and use the OD Matrix from layers as lines (M:N) i get NULL values. My network layer is correct (as it works for shortest ...
RDC_Green's user avatar
4 votes
1 answer
434 views

QGIS Network analysis: speed for walking time, considering ascent

I'm fairly new to QGIS and I'm doing a personal historical project on some network analysis for my local area. I've got my points and my road/path network, distance matrix, etc. However I can't help ...
tookiebunten's user avatar
2 votes
0 answers
227 views

Concave Hull around Line Features

I am using QGIS 3.16.10. I know that the Concave Hull tool is normally used with points, but I've used it successfully with line features before (k-nearest neighbor only). I'm just trying to get ...
Russell Toler's user avatar
1 vote
0 answers
27 views

How to remain or reconnect the attribute of the "from" and "to" point in network analysis

I am doing a network distance analysis from layer 1 to layer 2. I used GRASS/v.net.distance. I have one problem with the outcome is that I cannot link back the result with the original point layer. ...
mnguyen's user avatar
  • 79
6 votes
2 answers
1k views

QGIS Plugin for Shortest path with multiple Stops

I have been asked to find the shortest route from a particular start point to multiple properties along our shires road network. In QGIS I have tested the different network analysis tools and other ...
Josh's user avatar
  • 323
1 vote
0 answers
26 views

QGIS clipping OpenStreetMap but still being able to run functions such as ORS Tools on the layer [duplicate]

I have struggled to find a solution to be able to clip an OpenStreetMap (OSM) raster layer but still run functions using plugins such as ORS Tools. I would like to clip OSM with an overlaying vector ...
James the Flooded Roads Guy's user avatar
2 votes
0 answers
125 views

Calculating driving time between two layers (patients & hospitals) using QGIS

I need to calculate the driving time (following US roads) from patient coordinates to hospital coordinates. In total, I have ~ 250,000 driving time to calculate. I previously used ArcGIS but now I ...
Anna's user avatar
  • 21
2 votes
0 answers
49 views

Setting restricted segments in network using QGIS

I am trying to set up a network with QGIS. When I set the direction field there are three options for the values in that field: Forward direction Backward direction Both directions but I need to set ...
Raúl Casado's user avatar
  • 1,069
2 votes
1 answer
330 views

Network Analysis - Service Area Tool doesn't consider all lines?

using the Service Area Tool from the Network Analysis (Toolbox) gives strange results. As you can see on the screenshot the calculated blue service area (network: streets; start points: points; path ...
Markus's user avatar
  • 21
0 votes
1 answer
210 views

Iterate the shortest path point to layer

I have two layers. First layer defines the starting points and the second defines the end points. I just want to iterate the same algorithm "point to layer" by considering all the points of the first ...
Janith Rathnayake's user avatar
2 votes
0 answers
71 views

Shortest path analysis has unattainable vertices in result from PyQGIS

You can try this code directly in the console. It basically finds the shortest path but I only have unattainable vertices in the result. Do you know how I can correct this? My layer consists of ...
Alexandre Conte's user avatar
1 vote
0 answers
123 views

Creating distance radius along line network from point [duplicate]

In QGIS I'm trying to create a 1/4 mile radius (1,320 ft) around a point. I could obviously use buffer, which shows 'as the crow flies' - but I would like this along with the road network (in green). ...
Russell's user avatar
  • 11
1 vote
0 answers
133 views

Keeping ids and attributes of source features when creating QgsGraph?

I followed the example in QGIS documentation for Network Analysis library to create a graph from a vector layer. When building the graph, the features of the line layer are added as arcs (edges) to ...
Anafi's user avatar
  • 11
1 vote
1 answer
2k views

QGIS 3 - shortest path routing for multiple pairs of origins and destinations over a road network [closed]

I'm trying to map routes from an O-D survey with about 450,000 individual trips with different start and end points defined by lat, long. I want to estimate total VMT for the area by extrapolating ...
Jamie DeWeese's user avatar
4 votes
1 answer
642 views

Dijkstra/Finding shortest path gives back a tree with only -1 in it

So I'm trying to implement a routing algorithm in my QGIS 3 plugin that I'm writing using Python. I think I could resolve all the problems concerning the break between QGIS 2 and 3, but my resulting ...
user125606's user avatar
3 votes
1 answer
3k views

Seeking Vehicle Routing Problem and Location-Allocation Tool in QGIS?

I was wondering if there was a tool in QGIS that is similar to ArcGIS Network Analyst's Vehicle Routing Problem and Location-Allocation tools? I could not find any info about this in the internet.
Omer Sarikaya's user avatar
1 vote
1 answer
510 views

Distance vs cost in QGIS network analysis

I'd like to calculate shortest route and distance in QGIS 3.2. In the past I have used the v.net.iso, v.net.distance and v.net.path tools. However, I've noticed that there is no distance parameter ...
Curious Girl's user avatar
3 votes
0 answers
353 views

K-shortest path between two points in QGIS

I am new to QGIS. I have a road network layer in QGIS. I can compute the shortest path between the two points over the road network layer via the Network Analysis toolbox in QGIS. I am interested in ...
Salil Sharma's user avatar
1 vote
0 answers
902 views

Shortest route batch calculation in QGIS 3.2.2 with v.net.path GRASS GUI

I have three shapefiles: road network, postcodes and destinations. I`d like to calculate the shortest route between the postcodes and destinations (multiple points in each layer) Could anyone ...
Curious Girl's user avatar
0 votes
1 answer
311 views

Line network integration analysis in QGIS

I want to analyse how integrated a line (e.g. road, stream) is within a network. I want to perform the "integration" type of analysis identified by Javadi (not the connectivity or choice analysis) i.e....
Bryce's user avatar
  • 1
3 votes
0 answers
124 views

Improve performance of QgsVectorLayerDirector.makeGraph() in PyQGIS 3

Porting a plugin that makes excessive use of PyQGIS networking capabilities I had to realize, that building the graph (makeGraph() method of class QgsVectorLayerDirector) in PyQGIS 3 (https://qgis.org/...
Jochen Schwarze's user avatar
3 votes
0 answers
90 views

Use vector layer attributes as edge properties of a QgsGraphArc with PyQGIS

With PyQGIS 2.18 I created a QgsGraph as describe in the PyQGIS developer cookbook, Release 2.18, ch. 21.2, pp. 95-97. In the cookbook it says "Vector layer attributes and length of an edge can be ...
Jochen Schwarze's user avatar
3 votes
1 answer
721 views

Turning QGIS Network Analysis' service area point results into polygons or paths?

After using the Service area tool in QGS 3.0.1, I'm left with a point layer with each feature representing the furthest one can reach on the network given the parameters (max minutes or meters). How ...
Henrik's user avatar
  • 369
3 votes
1 answer
305 views

QGIS network analysis, points on graph cannot be reached

Using QGIS 2.18.14, I try something around with qgis.networkanalysis module as described here: https://docs.qgis.org/2.18/en/docs/pyqgis_developer_cookbook/network_analysis.html director = ...
Jochen Schwarze's user avatar
2 votes
1 answer
631 views

How can I insert the result of the dijkstra algorithm as a feature in a table with PyQGIS?

I ask for your help with the PyQGIS API. Being a new user of GIS I would like to carry out an operation. It is for me to look for the shortest path in a graph using the DIJKSTRA algorithm. The code ...
hounto's user avatar
  • 155
2 votes
1 answer
1k views

Unable to open topology file for vector map, grass 7, v.net

I am introducing myself to Qgis using the FOSS4Glabs : https://github.com/FOSS4GAcademy/GST102FOSS4GLabs/tree/master/Module%206%20Lab/QGIS%202.2 I am facing a problem during the module 6 Lab of ...
Sébastien Blais's user avatar
12 votes
2 answers
1k views

Computing areas of influence using QGIS

I am trying to create a polygon layer showing polygons that correspond to a closest store. For a set of 30 store locations, the result should be a polygon layer with 30 features, one for each store. ...
ge0m3try's user avatar
  • 822
3 votes
2 answers
1k views

Fixed distance between two contours in QGIS

Is there a possibility in QGIS 2.14.1 Essen, when you select a contour line and give a fixed length of line, this line connects automatically to the next contour lines? I have two other questions on ...
Frodo's user avatar
  • 2,407