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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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28 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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2answers
36 views

Routing a consecutive set of points on a network

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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15 views

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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33 views

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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11 views

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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12 views

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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21 views

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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3answers
143 views

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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9 views

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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16 views

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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12 views

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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8 views

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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1answer
37 views

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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18 views

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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2answers
68 views

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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0answers
100 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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1answer
26 views

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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1answer
83 views

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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74 views

How to create equidistant points along lines (network)?

I am trying to create points at every X meters along a set of lines that represent a network. As suggested in QChainage doesn't place points evenly along dissolved lines I managed to this ...
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1answer
32 views

Network Analysis loop: fails to loop through desired points

This code is meant to automatically go through two sets of points, and determine distances from each point in one set to each point in the other set. However,the code does not appear to actually ...
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2answers
130 views

Networks plugin missing from QGIS 3.4.7?

I installed the Networks plugin in QGIS 3.4.7 successfully, but it does not appear in the Vector Tab. Can anyone suggest another way to reverse the direction of a vector used in a network (graph)?
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24 views

From everywhere to everywhere in ArcGIS using Closest Facility did not solve all possible routes

I am building from-everywhere-to-everywhere routes in ArcGIS Network Analyst using OpenStreetMap Data. I have 189 points that I want to connect with all possible other facilities. I ran this using the ...
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156 views

QGIS 3.4.6 “Network access is disabled” on WiFi only

I get this error message when connecting to OWS from GeoServer in QGIS 3.4.6 LTR on Windows 10 on WiFi only. Failed to download capabilities: Download of capabilities failed: Network access is ...
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1answer
17 views

Spotty and Impossible Route (Closest Facility)- ArcGIS Network Analyst

I am trying to find the closest facility for parcels (converted my polygons to points), to existing sewer lines. In the image you can see that some sections of the green routes are just very short ...
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2answers
122 views

Generate points along branching lines

I am looking to generate points along a series of connected lines at regular intervals, but I wish to keep this interval even when a line is branching into 2 or 3 other lines. All the regular tools I ...
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0answers
71 views

Using v.net.flow in QGIS/GRASS GIS?

When I try to use the v.net.flow tool in QGIS, the output datasets have a value of 0 for every feature in the flow column. Almost every other v.net tool works, such as v.net.steiner and v.net.distance....
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22 views

Using Scaled Cost Point Barriers in ArcMap Network Analyst?

I sometimes see reference to scaled cost point barriers in the Network Analyst extension of ArcMap, both in answers on Stack Exchange such as this answer to Using Local Routing Tool in ArcGIS ...
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90 views

OD-matrix (QNEAT3) doesnt return values for all input parameters in QGIS?

I'm running into problems trying to calculate shortest distance from point (smaller black dots below in image) to a port (tagged MANAUS below). Im using hte QNEAT3 OD-matrix tool (from layers as lines)...
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74 views

Qneat3 / shortest distance calc sensitive to altitude?

I'm trying to calculate shortest distance using Qneat3 (using both the shortest path and OD-matrices for different purposes). And am wondering if there is any possobility to factor in altitide (it is ...
2
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1answer
284 views

Computing Shortest Path Distance for multiple points in QGIS

I have been looking for ways on how to compute the shortest distance between one point to multiple points using a specific road network. I have not been successful in achieving the solutions in this ...
2
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1answer
328 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 ...
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67 views

Experiencing Error 80070035: Network Path was not Found?

I am trying to install ArcGIS for Server 10.4. I am experiencing an error which states Error 80070035: Network path was not found as outlined below: https://support.esri.com/en/technical-article/...
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3answers
157 views

Perfect circle buffer on QGIS Madeira 3.4

Working on a road junction I would like to make a perfect rounded circle buffer of 1 km around this junction in QGIS 3.4. Here is what is look like now.
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1answer
84 views

shapely wrong output — when snapping points to line shapefile

I have a series of nodes to be connected to a road network, so as to calculate the cost of transportation. I used shapely to snap the nodes to the road network polylines. Most of the connections ...
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21 views

Create shortest route for a set number of units

I am running a field survey and would like to create routes for the surveyors. I have the building lots and road network for a particular city (road in red, lots in blue, with a Google Maps basemap): ...
3
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1answer
80 views

Pipes do not connect to each other - geometric network

I have created a geometric network in ArcGIS for Desktop. Some of the pipes are not logically connecting to each other even though they appear to geometrically intersect. Can anyone tell me how to ...
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1answer
90 views

Disconnected features in Python, QGIS

I'm working with code from the Disconnected Islands plugin in QGIS x64 and Python. Normally, the plugin ends by writing the FID of features to a CSV and their corresponding network group ID. Instead, ...
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1answer
46 views

v.net.allpairs - Missing parameter value: WHERE condition SQL statement without where keyword

v.net.allpairs is not running in QGIS 2.18.27 (but runs in QGIS 2.14). QGIS 2.18.27 has responded: Missing parameter value: WHERE condition SQL statement without where keyword. How to fix that?
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2answers
99 views

Tool in QGIS to construct polygons based on network of lines

Is there a tool in QGIS similar to "Contruct polygons" in ArcGIS that creates polygons from existing lines? This is different from convert lines to polygons that requires closed loops (minimum of ...
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1answer
188 views

Shortest path using line layer QGIS

I have a layer consisting of aprox. 20k lines What i want to do: In Qgis I want to be able to enter a start point and a end point. Preferably with street addresses and in second hand with ...
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21 views

Extracting Bus Routes from OSM [duplicate]

I'm looking to extract bus routes from OpenstreetMap as KML files so I can then convert them to shapefiles in ArcGIS. However I keep getting this error message as seen below. Does anyone have any ...
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1answer
130 views

How do i draw London Bus Routes? [closed]

I want to draw all London bus routes. I have the associated bus stop locations and sequences. Is there a quick way to draw the routes? My end product would be a shapefile or layer file / table with ...
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1answer
38 views

Arcs from a Delaunay Triagulation

I am trying to generate a Cost Distance table using Spatialite. I have several points in the table random_points for which I would like to compute the Delaunay triangulation and use the segments it ...
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1answer
144 views

Merging isolines into polygons in QGIS, building an isochrone map

There is a set of isolines produced with v.net.iso. It shows distances in meteres [400, 800, 1200, and everything further] from a certain point. My desired output is an Isochrone map. However, I do ...
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0answers
59 views

Dealing with bridges over roads in PostGIS topology?

first time posting please ask for more details if not enough provided. I am using OSM road data and have created postgres topology for them. I am now cleaning up the data before exporting it for ...
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0answers
302 views

Topology Network in PostGIS database

I'm returning to the same question all over again. I'm dealing with electrical network and I'd like to build topology for all network lines in database so I can construct nodes and edges dynamicly for ...
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1answer
73 views

Displaying two separate Excel files on same map? [closed]

I have started to learn ArcMap. I have two separate Excel files which are: Border coordinates, CSD coordinates. For each Excel files, I have information for longtitude and latitude. My aim is to see ...
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0answers
255 views

Get the nearest distance between two points in a road network using GDAL/Shapely/NetworkX

I want to measure the distance between two points in a road network like this: I have the road WKT and also the points WKT. I know that I can measure this using QGIS (road graph plugin) or PyQGIS, ...
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1answer
277 views

Network service area - QGIS

I want to check if schools from my hometown are accessible for students who use public transportation, so I need to perform this analysis in order to see if the schools are located in the range of ~...
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3answers
847 views

Shortest path between one point to every other points

I am trying to figure out how to find all the shortest paths from each point and each node of a line to the other points and nodes of lines of this map. I have tried to do it in Python using NetworkX....