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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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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48 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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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 cant connect too. This of course ...
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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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30 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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Identifying road intersections from an axial map

I am doing an analysis of number of road intersections per sq km. The idea is to both identify actual road crossings that are controlled with traffic signals (found on roads with higher speed) but ...
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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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28 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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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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Column value as index in function

This comes from the solution of another question. I have a network of polylines representing a river network, where I am working to make a calculation at each point on the polyline, based on some of ...
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177 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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Extracting node link table from QGIS

I have a road network in QGIS composed of the nodes layers and the links layer. I need to extract a node link table from this which would give the start node, end node and the distance for every link ...
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17 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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72 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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1answer
37 views

Remove 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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186 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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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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How to build isochrones with GeoTools?

It is possible to compute shortest paths with GeoTools with its graph package. Is there a package (or extension) for computing isochrone lines or areas, that is the area which can be reached from a ...
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Find for each point-feature in layer the nearest point in other point-ayer over a network

I'm looking for a solution for following problem: given a point layer A (10.000 points) given a point layer B (15.000 points) given a line layer C, as network (waternetwork) I want to have for each ...
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197 views

Accessibility analysis using isochrones and network analysis tools QGIS 3.16

So I made an isochrone using ORS Tools plugin, as well as using the Network analysis toolbox to analyze the service area of the bus stop. Ultimately I want to provide a statement of X% Area covered ...
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106 views

How to split network in equal piece line segments in R

I create a SpatialLines from x and y coordinates. I was wondering is there a way to pick 5, 10 or m number points on the network which are equal distance to each other at least (2:m-1) ones have equal ...
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30 views

How to divide polygon into multiple zones given several points (Network Paritition) [closed]

I'm new to QGIS. I have a layer containing all the points of interest. I will like to divide a city into different zones (service area) depending on the location of these points so that each zone will ...
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1answer
50 views

Pgrouting: problem with pgr_withpointsDD

I'd like to calculate a propagation from sources using my road graph. In extenso, I'd like to answer the following question: where are the limits of my isochrones for every sources I got. My sources (...
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Creating route between specific nodes based on sequence in QGIS

Right now I am working on a project related with the german railway network. I have a layer call "Stops_1_2" which contains the trip id, the stop sequence and the name of the station. I have ...
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38 views

Snapping two topology layers together based on point

In QGIS 3.14.15 with GRASS 7.8.3 I have two layers both with correct topology that function how they should. When using the Network Analysis > Service Area tool, they work as they are supposed to. ...
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77 views

GIS network tracing - water network

I have been trying to find out if it is possible to trace through a water network that will consist of line features representing water mains. Tools exist in both QGIS and ArcGIS to help with this and ...
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Validating network geometry

I have 2 sets of data: A network data and I want to validate it with another B network geometry which is a moving van trace data Since the trace data is very raw without any attribution, is there a ...
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20 views

Optimize distribution of buffers

I'm currently moving from using QGIS more as a visual tool to an analytical one. I am hoping to get better at optimal location distribution. I have a dataset of census population data visualized as a ...
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1answer
109 views

How to connect edges in a network even if they dont' exactly match spatially

I am using R with the following packages: library(sf) library(sfnetworks) library(tibble) I would like to create a sf network (spatial network) with some tolerance of distance between nodes I Created ...
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How to get all ID's for a line in a network of lines in order

I have a path (pink) in a network (green) and I want the id's of all the lines that make up that path. They are two separate layers. What I need returned is a list of id's in their order starting ...
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Distance from point to two neighboring points (both directions) in on polyline of pipe system

I need to find the distance of a valve to the two neighboring corners in a piping system. I have the following shp files: -Nodes for the valves -Nodes for the corners -line layer file of the piping ...
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126 views

Reading shp using networkx, parallel edges are missing attributes

I am trying to use networkx.read_shp to create a MultiGraph from a shape file. I understand that the function needs to be modified since it usually creates a DiGraph I attempt by trying this: def ...
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My service area polygons are not right, look more like road buffers

I have included a screenshot of my settings and what one of the polygons looks like. I have this set to approximately 10, 20, and 30 mile service areas and this entire segment is only about five miles ...
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1answer
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Separating network data by using attribute table field

I'm trying to separate historic network data (by symbology) that I need in the same shapefile, as my data contains two different types of network "Route" and "Stairs". I tried ...
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58 views

Matching IDs between point layer and network layer when doing network analysis using “Service area”

Update: It works! The attempted solution shown below works in QGIS 3.10.4 LTR. But in QGIS 3.12.3 it failed in the processing step "qgis:serviceareafromlayer" as some of the features were ...
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140 views

QNEAT3 doesn't work on all networks

I have a point layer and three different network layers and am trying to create OD-Matrices for all the points using the QNEAT3 plugin. It did work out fine on two of the three networks, but the ...
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1answer
41 views

Generating flow map with varying width and alpha level which accumulates using ArcMap

I'm using ArcMap. I have a very large line shapefile with ~300'000 links which all have the attribute flow (a numeric variable from 0-200). My goal is to display a map like in this example (produced ...
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Bay Area Synthetic Network node/line coordinates

I just started working with the Bay Area Synthetic Network and was wondering if this dataset has location (lat/lon) information. I have visualized the files with QGIS, but when it comes to exporting ...
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I cannot use Point entry into Graphical Modeler in QGIS

I would like to use a Point entry to get the point coordinates in the map to add in the network analysis as a start point. I have added the Point entry into Graphical Modeler, I can click on the map ...
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55 views

PostGIS - Add Column of Lines that Intersect Point

New to PostGIS. I have a road network which I have self-intersected/inner joined to generate nodes at each intersection. I would like to add a column to the junctions table which lists all of the ...
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QGIS plugins for creating circular route on footpath network

I'm looking for a way to create random circular walks of a specified distance from a given point. The end result will be similar to https://routeshuffle.com/ and http://www.routeloops.com/, but along ...
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Shortest path not recognising network as connected

I'm trying to use a grid network that I have created to find the shortest path between two points accounting for directional wind-speed. The problem I'm running into is that the shortest path feature ...
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1answer
459 views

Distance Matrix of Shortest Paths from all m points to all n points through a network

This question was asked many times and I could reference endless GIS-SE links here. Most of them suggest using pgRouting, which is not an option here. I have to use QGIS (for other technical questions)...
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Service Area - Not taking into account of all network

I'm trying to work out an 800m service area from a station. However, QGIS is not taking into account some of the network lines. The yellow colour highlights the network that should be included in the ...
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377 views

igraph matching coordinates of map: project from lon lat to a x,y scale?

I would like to use igraph plotting a network on top of a map. For igraph nodes, I would like to use coordinates from the map (the centroid of polygons). I have now tried for hours but somehow I ...
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Connect points based on underlying road network in QGIS

I have a road network layer. I also have the latitude and longitude of the bus stops in that road network. I want to connect a series of these stops but not using straight lines but via the underlying ...
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1answer
31 views

Attach features of lines to points

I am trying to calculate the cost of network to homes. In the image i have cable (brown line) between utility boxes(pink/blue points) and home feed (black dash) to the home. I know the cost for each ...
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Checking if network has connection errors

I have given a network of a city in dwg. I made a dxf that only contains the network itself, and created a layer for every type of pipe (like 25KPE, 80KPE etc...). How do I check if the network is ...
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36 views

Measure the reachable amount of points by a given distance

I want to measure the amount of points that are reachable given a certain amount of walking time or walking distance along a streetnetwork. Furthermore, I want to have the amount of points reachable ...
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1answer
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Counting points between two intersections: Roadway Network

I have a roadway network as a line feature and crashes as point features. I need to count the number of points that lie between two intersections of roadways. The biggest problem is the road is also ...

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