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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37 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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Strange “Exception Unknown” Error - Alternatives to OD matrix from QNEAT3? Possible graph failure with OSM data? [duplicate]

I have previously posted this but I've been running into a hard to understand problem using QGIS's QNEAT3 Plugin. I've contacted the creator of the plugin and he was unsure of the problem too. I'm ...
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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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50 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
30 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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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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130 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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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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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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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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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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63 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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37 views

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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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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100 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 a point to the two neightbouring points (both directions) in on a polyline of a pipe system

I need to find the distance of a valve to the two neightbouring 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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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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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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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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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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38 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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1answer
50 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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Joining node layers to their containing edge layer with correct IDs

I am not very experienced in QGIS as I have been working on it only as a student. My question has to do with ID matching. I have a line shapefile, which represents roads (polyline tbh), and I have ...
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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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Permanently binding SQLite Databases in ArcMap

I have a problem with SQLite in ArcMap 10.7.1. We have a sqlite-Database, which is stored on our company's server / network. The database contains the calculation results of a sewer network simulation....
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338 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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1answer
270 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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Extract the last vertex of a road network using QGIS 3.10 [duplicate]

I have a multilinestring layer representing a 10 km service area from a school. I would like to extract the vertices located at the ends of this network. How can I do?
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Network Analyst Tool - Closest Facility

It's the first time I use the Network Analyst Tool (Closest Facility) in ArcGIS (version Desktop 10.6.1) and I ve just faced this kind of issue. I have two point shapefiles (for example, the "...
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Issues with pg_routing installation on Mac

I've never had issues with installation on PC but now I'm trying to install on Mac and at first, when I went to create the extension after I downloaded I got a message that said something like cannot ...
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1answer
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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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1answer
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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Creating a Service Area with 6 hours Travel Time on ArcGIS Online

I am creating a series of Service Areas using the built in networking features on ArcGIS Online. I need to create an area with 1 hour intervals for 6 hours of travel time. The issue is that ArcGIS ...
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QGIS 3 Processing tools don't seem to work (can't load output)

I've got a new machine running on Win10 (I was previously on Win7) and I can no longer use... pretty much any algorithm, especially from SAGA. It's probably something to do with environment variables,...
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Electrical Distribution - ArcGIS

I am currently developing a project for which I need to make the preliminary design of the electricity distribution network topology for a population. For this I have the location of the consumers (...
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What is the term for creating a network from scratch?

As part of my PhD, I developed a simple way of creating a road network splitting up collected coordinates based on where they cross. I know the standard method is to use a shapefile (or similar) as ...

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