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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.

2
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0answers
17 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....
0
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0answers
17 views

Elucidating network distance formula [on hold]

I have GIS data with latitude, longitude, and time. There are several tracks. From there I would like to calculate the network distance. I am currently using the following formula (length1/time1 + ...
0
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0answers
10 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 ...
0
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0answers
20 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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0answers
21 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
votes
1answer
34 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
votes
1answer
60 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 ...
0
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0answers
9 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
61 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.
0
votes
1answer
31 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 ...
0
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0answers
20 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
votes
1answer
48 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 ...
1
vote
1answer
58 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, ...
0
votes
1answer
22 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?
2
votes
2answers
55 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 ...
-2
votes
1answer
52 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 ...
0
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0answers
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 ...
1
vote
1answer
55 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 ...
1
vote
1answer
28 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 ...
1
vote
1answer
84 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 ...
3
votes
0answers
54 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 ...
2
votes
0answers
108 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 ...
1
vote
1answer
72 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 ...
0
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0answers
189 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, ...
0
votes
1answer
101 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 ~...
7
votes
3answers
386 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....
-1
votes
2answers
104 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
votes
1answer
151 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 ...
1
vote
0answers
21 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" for 1 star ...
1
vote
1answer
58 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 ...
1
vote
0answers
25 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 ...
2
votes
0answers
28 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 ...
0
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0answers
36 views

GRASS GIS Shortest path: Limit on number of calculations?

I'm trying to compute the shortest path between about 10'000 location-pairs. I've prepared my vector map as described in the documentation. I can calculate shortest path on about 1'000 location pairs ...
0
votes
3answers
59 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, ...
5
votes
2answers
92 views

Dragging all veritices 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
votes
1answer
60 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 ...
0
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0answers
33 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 ...
-1
votes
1answer
64 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 ...
0
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0answers
41 views

Network Analyst closest facility in R [duplicate]

I am a complete novice to R so not sure if this is achievable. I have three feature classes (i) The x,y locations of place of residence (ii) Destination x,y (iii) The road network I can export ...
0
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0answers
17 views

Ways to make network analyst prefer one type of path over the other while preserving accurate distance and velocity

I am making a pedestrian network + transit network dataset, combining crosswalks (Blue), Sidewalks and Pedestrian Paths (Purple), local roads (Green) and collector roads (Black), as well as some ...
1
vote
0answers
31 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 ...
1
vote
0answers
34 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 ...
0
votes
0answers
41 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 ...
1
vote
2answers
568 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?
8
votes
2answers
259 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
votes
0answers
67 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
votes
1answer
94 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
57 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 ...
0
votes
0answers
20 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
votes
1answer
52 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 ...