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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21 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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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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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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39 views

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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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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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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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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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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43 views

Select Channel Network within QGIS

I have created a Channel Network polyline shapefile from the Channel Network tool in QGIS. I now need to select any channel routes which flow through the red polygon as shown below. The attribute ...
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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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Average raster value between points

I have a rasterized stream network, with point (species presence) data overlaying it. What would be the basic workflow for determining the average cell value between all possible combinations of ...
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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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QGIS Channel Network - Merging all polylines

In QGIS I have created a Channel Network using the SAGA Channel Network Tool. I would like to select all the Channels and their upstream network which intersect the blue polygon. Of course the Select ...
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43 views

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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Completing network edges through an area using osmnx

Context I want to plot a network (i.e. a graph, topologically connected where routing algorithms can be used) from openstreetmap data (this is linked with the python code snippet presented here: ...
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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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257 views

QGIS QNEAT3 AttributeError by creating isodistances/isochrones

Trying to generate isodistances/isochrones in the QNEAT 3 plugin I got the following error: > Traceback (most recent call last): File > "C:/Users/User/AppData/Roaming/QGIS/QGIS3\profiles\...
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Routing consecutive set of points on network [closed]

I need to generate routes based on a consecutive set of points exactly as given in this routing script by Anita Graser. As given in this image, I have a layer of consecutive points as well as a ...
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Incorrect result when using v.net.distance on grass76

As shown in the image below I need to connect the points in yellow to the respective nearest point in brown via the shortest path on the road network in blue. I decided to use v.net.distance on ...
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Connecting points to lines via network layer in QGIS

So I have a set of three layers: A set of points A road network layer A line layer (e.g. which represents a cable) I need to find the shortest paths which connect the points (Layer 1) to the line ...
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Error with v.net

When running v.net on CentOS 7 I ran into the following error: GRASS 7.6.0 (srilanka2):/tmp/final > v.net input=roads points=bs output=network op=connect thresh=5000 Copying features... 100% ...
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Error when running v.net.distance

I'm running grass76 on CentOS 7. When I have a network map (generated using v.net) with layer 1 having the arcs and layer 2 and 3 having the sets of nodes that I need to connect. Details are as ...
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Shortest Paths Between Adjacent Points on a Network

With the project I'm currently working on I need to calculate how much the total length of the network increases as I expand it from one node to the next. I have the road network as a line layer (...
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Going back in for loop at the end of a while loop in ArcPy?

I'm quite novice in Python and ArcPy. I have a river network with Strahler orders (starting from 1). I want to create a new network where the new streams will start from order 1 till the outlet. (so, ...
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Terminal connection error when running v.net.steiner

I am using GRASS 7.6.0 on a CentOS server. I've attempted to run the v.net.steiner function on the map layer with the following properties: Layer/table: 1/network type count min ...
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Running v.net.steiner in segments?

I am using GRASS GIS 7.6 on a CentOS server with 157 GB of RAM. The vector categories of the network layer that I need to run the Steiner tree algorithm on are as follows: Layer/table: 1/network type ...
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QGIS Network - OD matrix within local neighborhood based on line feature length

I have a given road network dataset as polylines and want to create a network out it. For that, I found v.net from the GRASS GIS toolbox. Now (1) I'd like to get the OD matrix from the intersections ...
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Category Values parameter for v.net.steiner

So I need to extract the steiner tree along a line network connecting a set of points. The one part I don't quite get is what to add for the required Category values parameter. I initially thought ...
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Populating Route ID's in QGIS

I have a linear network of lines all digitized in the direction of flow and am trying to assign route ID's to segment groups. Is there an automated process to do this using QGIS?
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Error when using v.net in GRASS GIS

I'm new to using GRASS GIS and GIS in general. I have a point layer and a line layer which I added on to the layer tree using two .shp files. I need to use v.net tool to create a network by connecting ...
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Joining the attributes of two nearly congruent streetnetworks (lines) in QGIS

I have two streetnetwork layers containing both different attributes, none of them is similar so I can´t do a simple join. Unfortunately they are not congruent, but the line objects are close to each ...
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259 views

How to divide LINESTRING spatial network into equal length segments using R/sf?

I'm working on a project to model car crashes within the municipality of Milan using different statistical methods. I have a big dataset of all geocoded car accidents that happenend within the ...
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ArcGIS: Extract portion of a geometric network that exists 30 mi downstream of intersection with another layer

I have flow lines for streams. I've made them into a geometric network. The streams intersect with a rail network. I want to find all of the points of intersection and then get all of the flow lines ...
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Network analysis QGIS 3.4

I'm using the processing tool named "Network analysis" in order to analyze a sewage network. I'm using the tools "Shortest path" and "Service area". They work fine, but I can’t add blocking points ...

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