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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3
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0answers
169 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
35 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
426 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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33 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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0answers
481 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
19 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
158 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
107 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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221 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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91 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 ...
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1answer
942 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 ...
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1answer
723 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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3answers
255 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
142 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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22 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): ...
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1answer
120 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 ...
3
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1answer
155 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
69 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
292 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
424 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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1answer
201 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
45 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
269 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
88 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
492 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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1answer
541 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
2k 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....
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2answers
285 views

Network/Routing analysis with open source GIS

I am researching for ways to do network analysis or routing optimization with open source GIS. ArcGIS currently has an extension for this called Network Analyst but would like to keep my analysis with ...
3
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1answer
464 views

How do I remove roads classified as residential from an OSM slippy map?

I'm developing an application in which I need to have an underlying graph representation of streets. Google Maps does not provide this data, which is why I decided to use OpenStreetMap. I have ...
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0answers
25 views

Building graphs between two point layers

I am trying to run a script to find the shortest routes between two sets of point layers (Blue star and Green dots) in QGIS using road network. I am able to use GRASS gis "v.net.distance" ...
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1answer
312 views

Network Has Slow Performance in SDE

I am working with ArcGIS Network Analyst (10.5.1). I created a network in SDE and everything worked fine. The network is versioned on SDE. I updated the source line features of the network in a ...
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0answers
32 views

Split single polyline network at a point feature to make unique fields with unique distances

I am working with a large river network polyline shapefile. I am trying to calculate a dendritic connectivity index using a point shapefile representing locations. The river network shapefile has a ...
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0answers
79 views

Creating a continuous raster road network using Polygon to Raster in ArcGIS Pro?

I have a polygon forest road network that I would like to turn into a raster. I have attempted to use the ArcGIS Polygon to Raster tool, but whenever the majority of a cell falls outside of the ...
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3answers
75 views

Seeking article on network analysis, connectivity analysis, and proximity related to routes and influence of stations? [closed]

Unfortunately I lost a document I had found on the internet, and I do not remember the title the article was like a guide or recipe and it was in pdf format, and it was related to network analysis, ...
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2answers
284 views

Dragging all vertices at a given point programmatically in PyQGIS

I'm writing a Plugin where you build networks with point and line geometries. One Tool should give the User the possibility to make changes to the network by dragging and dropping the points to ...
2
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1answer
68 views

Drawing a map using time as metric instead of distance in QGIS

I am used to drawing maps in QGIS and overlaying on top them a road network map showing the distance between places, its a useful way of showing information about roads. But I am aware that its not ...
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0answers
55 views

Network Analyst takes so long

Is there some kind of limitations of number of features when we work with Network Analyst in SDE ? My net has 170.000 features, is it a problem ? Because it take at least 6 hours to finish the "Build ...
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1answer
134 views

Find minimum downstream flow distance from each polygon to any polygon in other feature class

The Problem: I have two polygons feature classes, let's call them "SourceAreas" and "DangerAreas". For each SourceArea, I need to know if water could flow to any DangerArea and if so, what is the ...
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0answers
40 views

Automatically locating endpoints (river sources) in a stream network

I have a stream network in ArcGIS 10.2.2 and I would like to know if it is possible to automatically add endpoints based on the stream network. The network is pretty big and doing this manually ...
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0answers
60 views

General Guidance on Integration of Sidewalks With Roads

I am trying to prepare a network dataset for network analysis. I have a road network that is pretty well constructed, and a pedestrian network that is not as well constructed. The red Lines represent ...
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0answers
54 views

How to tell what is wrong in the network dataset?

I work in ArcGIS 10.3. I have a network dataset consisting of lines and points. When I run the closest facility in Network Analyst, it works perfectly everywhere but on this particular edge/part of ...
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2answers
987 views

Network analysis, fastest path in QGIS 3.2

I used this plugin and got results in the cost field, but I do not know in which units the cost is displayed (€, $ ...). Whether it's money or something else?
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2answers
582 views

Equal Time Maps for Transit Network (Isochrones) on QGIS

I am on a committee looking to redesign transit service in Sacramento and need to be able to make equal-time maps or "isochrones," like the attached. A prominent difference between transit isochrones ...
2
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0answers
124 views

How to do a Closest Facility Analysis using OSM?

I have locations of about 1100 Branches across the country, and I want to find the closest branch for any user-provided point. I'm looking at OSM data, and supporting tools to do this, since I don't ...
2
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1answer
146 views

Distance between reference point to many Points along a line

I have a Line layer and a Point layer in Qgis. The lines snapped to the points. I need the distance between the reference Point (number 12 in the image) to the other points along the line. I have ...
2
votes
1answer
114 views

Building model that loops through several origin/destination points to create several different trip routes in ArcMap?

I have a Network Dataset ready to go for the streets of New York City, and from that I'd like to map out a table of individual taxi cap trips. From what I've been told, I should be using ModelBuilder ...
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0answers
41 views

Understanding the problem of applying A* on a multilevel network

I am currently working on an indoor routing project for a multilevel building.For this, I want to find a shortest path over multiple level (or 'floors'). I have read some papers on A* in such an ...
4
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1answer
60 views

How to name this sort of edge?

I'm searching for a certain pathfinding algorithm which considers a certain sort of branch in the network. However, I find it difficult to define my search term as I do not know how this certain kind ...
3
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1answer
482 views

Network Analysis PyQgis 3.0

I've been trying to build a graph from a projected (EPSG 27700) clean (no pseudo-nodes) street network. I followed the tutorial here presented employing the QGIS 3.0 functions; now the network ...

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