Questions tagged [network]

An interconnected set of points and lines that represent possible routes from one location to another, OR in computing, a group of computers connected in order to share software, data, and peripheral devices, as in a local or wide area network.

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Road network analysis for big data

Is it possible to generate service areas from 65000 facilities? Batch processing or database analysis? A friend tried with 6000 (1/10) facilities, OpenStreetMap data (country Latvia) to calculate ...
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3 votes
1 answer
39 views

Splitting line-layer with point-layer in QGIS

I have a separate layer with polylines that are merged into one object. I want to split it by a separate layers with points in QGIS. I have tried using the SAGA tool "Split Lines at Point" ...
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How to keep roadnetwork attributes by cutting it to a service area in QGIS?

I extracted a road network including attributes (e.g., categorization of different types of highways) using QuickOSM. My goal is to cut this original road network to a 50km drivable radius from a ...
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Extract a network from spatstat to graph object in igraph using R

I am looking for an efficient way to transfer a linear network (class linnet) from spatstat, e. g. library(spatstat); data('chicago'); net <- spatstat.linnet::domain.lpp(chicago) to a 'graph' ...
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4 votes
2 answers
225 views

Detecting and making all connected lines in the same direction in QGIS

I have a list of straight roads segmented which has a unique "ID". I would like to detect connected lines in the road network and make them in the same direction instead of reversing them ...
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7 votes
4 answers
195 views

Generating dangle point for polyline in QGIS

How do I generate the dangle points (into shapefile or something) (blue dots in picture below) of any polyline in QGIS? These are not start/end vertices.
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1 answer
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How to calculate Beginning and End Intersections of Polylines?

I have ArcMap 10.8.2 and am working with road networks consisting of intersecting polylines. Each segment has its own ID and I would like to calculate its position relative to other segments. The ...
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2 votes
0 answers
36 views

QGIS 3.22.4: Calculating region pair distances along network

I'm currently attempting to calculate the distances between several thousand region pairs (centroids) along the Roman road network in QGIS. I want to achieve something similar to the "Shortest ...
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3 votes
0 answers
128 views

Inconsistent QNEAT3 OD matrix (m:n layers as lines) results

I am running QNEAT3 on QGIS 3.22.4-Białowieża to determine the shortest path from one location to another along a stream network, but the results are inconsistent. This is being run as part of a ...
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  • 129
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32 views

Average distance between a city's residents and bank branches

I am using QGIS. I got the banks layer from OpenStreetMap data. How can I use population density data to calculate the average distance between city's residents and bank branches in that city?
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30 views

Polyline featureclass as water network [duplicate]

I use ArcGIS Pro. I have a polyline featureclass of a water network. I want to create polygon layer around these lines to became a coverage layer but I want that to be automated and not manual. Can ...
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2 answers
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coverage layer as water network [closed]

I have polyline featureclass as water network. I want to create polygon layer around these line to became coverage layer but I want that to be automated and isn't manual.
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28 views

Merging multiple road network shapefiles

I have created multiple connected road network shapefiles of the same extent based on a subset of point locations with the v.net connect operation. I split the point locations into 4 equal point sets ...
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0 answers
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Extract nodes and edges as road network from osm.pbf file with python

I have downloaded the israël's osm.pbf file from geofabrik. I want to extract the road network's country, which means a list of edges between two nodes ids. For a such tiny country, this list should ...
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5 votes
1 answer
56 views

Counting the number of duplicated links in QGIS

I have a network in QGIS illustrated as Step 0 in the following figure: In the actual network, these three links (red, blue and green) are geometrically duplicated. (I slightly shifted them to show ...
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0 answers
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QGIS QNEAT distance matrix - wrong outputs

The data and the problem I started to use QNEAT in QGIS (after very helpful advice from user Babel, here: Average walking distance). But when I was trying to pull some nice maps out of it, I noticed ...
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3 votes
1 answer
63 views

Network-based clustering with fixed-sized clusters in QGIS

I have address points connected to a network of roads that I have built using GRASS v.net.connect. I would like to cluster addresses into fixed size groups along the network. So far, I have written ...
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QGIS Toolbox for Loop Routes?

I am looking for a function or toolbox which allows for generating loop routes subject to constraints. It would look something like: Attribute Description Example Network Routing network OSM extract ...
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2 votes
1 answer
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MultiPolygonZ to nearest line using a road network (or: how far is the next highway from a project site?)

I have a MultiPolygonZ layer of Project Sites (ca. 700 features, mostly 1 polygon per feature) and want to get the shortest distance on a road network to the nearest subset of a line layer, e.g. the ...
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4 votes
1 answer
379 views

Average walking distance [closed]

I have OSM network (or city created network, either will work just fine), then I have point layers that corresponds to buildings (or rather entrances) with the number of inhabitants and lastly a point ...
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0 votes
0 answers
29 views

Finding lines that are not connected to network in QGIS [duplicate]

How can I find lines that are not connected to a network and identify "gaps" in a network? See example below:
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Converting shapefile to digraph [duplicate]

I have used '''nx.read_shp''' for converting shapefile to network, but the result I am getting is quite different from how the actual shapefile looked like.
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0 votes
1 answer
16 views

Closeness weighted sDNA Analysis

I am doing sDNA processing. I'm trying a set closeness/farness centrality processes, differing the origin weights. But the results are not showing numerical differences for the MAD/MED, NQPD and other ...
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1 vote
0 answers
32 views

Points to line in a river network

I'm trying to build a network from these points. I've tried points-to-path but it's not giving me the desired output. The problem is that the Node ID that comes from the shapefile is not actually in ...
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2 votes
0 answers
26 views

Property from Expression in Shell Script

I am using qgis_process in a shell script (Linux) to make a buffer using a field as the distance. I can get a buffer from the shell with qgis_process run qgis:buffer INPUT=pt.shp OUTPUT=buffered.shp ...
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2 votes
1 answer
45 views

Modelling elevation in 3D link-network for sDNA in ArcMap

I have a 3D link network model (multiple grades/levels joined by vertical links) that I would like to analyze using sDNA. Since the topography is uneven, I would like to account for the terrain before ...
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2 votes
1 answer
186 views

Counting nodes and edges in road network

I have a road network 'TR_ROAD' with EPSG:4283 crs and 1219 features. Based on geospatial theory, the road network is combination of nodes and edges. I am trying to count the number of nodes and ...
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Limitations of geometric networks in ArcMap (Cost Calculation)

I am working with a point dataset and a street network within a geographic region. This region is divided in sub-divisions for which I want to calculate single networks within their area. Every single ...
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2 votes
1 answer
64 views

Road network division and best maintenance facility location using ArcMap

I am using ArcMap. I have a national road network and I would like to divide it in several zones, so each zone would get the same amount of roads (from 150 to 250 km) - to get as equal zones as ...
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0 votes
1 answer
29 views

Selecting lines forming loops (not dead ends) within network dataset using ArcMap

I am looking for a way to select and export all segments of a network dataset, which are not dead ends. One way to create dead end sections is to calculate dangles and select intersecting sections. ...
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1 vote
0 answers
43 views

Dissemination on a network

I'm looking to map the streams in which certain pollutants are found. These readings are points, and we assume that the water downstream of each point is contaminated. The mapping is not binary but ...
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0 votes
1 answer
25 views

ArcMap near table but with taxicab geometry

ArcMap 10.4.0.5524 for Desktop. No internet connection. I have a shapefile with ~ 200,000 line segments that connect at the vertices to form a network. I would like to generate a table with the 1000 ...
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3 votes
0 answers
50 views

Multi-computer distributed operations using QGIS

Although QGIS is multithreaded for some operations, There are many cases where I run large operations for cumulative viewsheds which take an extremely long time to calculate. Is there a process ...
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4 votes
2 answers
89 views

Calculating number of points within 400 meters along network route

I have a layer with (several thousand) addresses, for every one I need to find the number of shops (155 total) within a 400 meter road network. Because of the large number I need to find a tool to use ...
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6 votes
4 answers
197 views

Automated extraction of road network from points

I have a huge dataset containing about zillion of points representing tracking locations of cars on the roads. I also have roads datasets to compare to (from 3 different sources), to use for training ...
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8 votes
1 answer
498 views

Calculating the nearest neighbour using given road network in QGIS

I have the following information/layer: Address points (point layer) Points which represent the entries to urban green spaces (point layer) - I built these cutting the roads with the borders of a ...
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2 votes
0 answers
53 views

Converting a QGIS project to a PBF file

I have a QGIS project with 3 layers: OpenStreetMap layer Polygon representing a specified area on the map Lines representing streets in that area on the map How do I convert this project to an ...
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2 votes
1 answer
125 views

Flooded roads and deprived communities: QGIS route analysis function to avoid flooded roads?

In QGIS I am analysing the flooding of road networks. I have created a vector line layer of all the stretches of roads in my study area where high risk flood extent areas intersect them. I now want to ...
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3 votes
2 answers
36 views

Isolating islands within a network (using QNEAT3)?

I’ve run into a bit of a pickle. I’m attempting to isolate “islands” within a large OSM-derived network. I’m interested in highlighting areas where the network cannot connect to. This of course ...
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0 votes
0 answers
111 views

Calculating the longest path length in drainage network using Python

I have a drainage network and I want to obtain the longest path length between two coordinates of the shapefile; is there is a way to automate this process in Python? For example, in the image, I want ...
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0 votes
0 answers
40 views

Clipping with Voronoi polygon using QGIS

I'm trying to clip a road network (polyline) with Voronoi polygons. The polyline don't clip but I don't know why. I try to separate my road network according to geographical points collected in the ...
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1 vote
0 answers
69 views

Split intersections of lines considering bridges and tunnels

I want to make a road network routable. I already have a road shapefile, but there are many intersections of lines that I want to split. Now I have two problems: (1) My first approach to split them ...
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1 vote
1 answer
138 views

How can I calculate the distance between multiple points in a network?

I have multiple points on multiple lines in a network and I need to know the length between these points along the network. I need an OD matrix, like the QNEAT3 distance matrices but for the distance ...
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1 vote
0 answers
397 views

Connecting nodes to existing network lines using QGIS

I have road network (polyline layer) and point layer: I am trying to connect nodes to the existing network lines. I able to connect nodes with lines using connect nodes to lines in Networks in QGIS ...
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2 votes
1 answer
443 views

How to Iterate through files in a folder QGIS, using python

I am using QGIS 3.16, and I am trying to run the “service area from layer” function on approximately 400 layers (200,000 starting points in total), I am also due to be repeating this at a range of ...
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1 vote
1 answer
23 views

Editing network for shortest path

I am editing road network to create scenarios but Shortest Path is not recognizing the edits. I am assuming the edited street network is not connecting with other streets at intersections. I have ...
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1 vote
1 answer
96 views

Recursive calculations on a river network

I have a dataset that contains network distances along a river network. This dataset was created using Topotoolbox in Matlab, with the node and segment information exported. I've been working on the ...
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5 votes
2 answers
90 views

Removing additional lines from vectorized stream network

I have a large raster stream network (excerpt below) in QGIS that has been thinned using r.thin (light blue squares) and then vectorised using r.to.vect (pink lines). However, because some of the ...
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5 votes
2 answers
519 views

QNEAT3: Iso-Area as polygons problem

I am using the QNEAT plugin to calculate catchment are/travel reach over a street network. The network is valid and projected correctly. I have tried changing the cell size and topology tolerance ...
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1 vote
0 answers
98 views

Route optimization with QGIS

I need to optimize the routes of a collection vehicle working with QGIS. To do this I have a network layer and another with the collection points, both of then in a geopackage. What I need is a new ...
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