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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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10 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
47 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
40 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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0answers
20 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
33 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
25 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
53 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
43 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
54 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
62 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
65 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
69 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
234 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
83 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
120 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
19 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 ...
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1answer
33 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
21 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
26 views

Guide to GRASS v.net GUI use

I have a road network layer and a postcode layer. My aim is to create an isochrone map where I can show the travel time to each point, using v.net.iso. These points are not on the network therefore I ...
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0answers
28 views

Displaying two different folium.map object into same map

I want to show nodes with their avg neigbour attributes and network of these nodes belong. ox.plot_graph_folium returns a folium.map object. "map" is also a folium.map object so when i try to add "...
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0answers
59 views

osmnx using new clean intersection nodes as graph nodes

I want to create a new graph from clean nodes and edges. From that, OSMnx Example #14 Clean Intersection Cluster Nodes, I am able to get the street network and do the processes like shown in the ...
2
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0answers
21 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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0answers
29 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 ...
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3answers
57 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
63 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 ...
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1answer
58 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
32 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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0answers
7 views

Can you do multi day analysis with Network Analysis

I have some service locations that don't need to be visited everyday of the week. For example, service 1: everyday visit-- Service 2: every other day-- Service 3: every 3 days... Is there anyway to ...
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1answer
56 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
37 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 ...
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0answers
14 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 ...
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0answers
29 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
27 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
37 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
460 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
194 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
51 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
85 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
46 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
18 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 ...
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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 ...
2
votes
1answer
223 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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1answer
108 views

Identifying road segments completely cut off by polygon using QGIS?

I have a road network (black line) and I want to identify all segments that are completely cut off by my flood polygon (blue polygon). I have clipped the road network to get all roads within the road ...
2
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0answers
80 views

Cluster Points on spatial network in R/QGIS

I am searching for a method for clustering spatial points along spatial lines. The points are connected to the lines. I tried nearest neighbour clustering and gProject/gInterpolate from the rgeos ...
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0answers
54 views

How to find the shortest path in QGIS after crossing road

I have a sidewalk layer in QGIS and some points. I want to find the shortest distance between the 2 points. If the line is contiguous, then shortest path finds it. But if it is not contiguous (the end ...
2
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0answers
206 views

Creating network using QNetwork?

I have a point shapefile (Houses.shp) and various lines shapefiles (SemiRadial.shp, MST.shp, Ring.shp, etc) representing respectively houses of a village and possible microgrid network layout ...
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2answers
159 views

Create network from points in QGIS using grouping variables

There seem to be some answers for this problem for ArcMap, but not for QGIS. I have a set of points representing the power grid and I want to produce a network from them. Here's my data: ID ...
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0answers
54 views

Generating bus network segments between stations

I have a network I downloaded from OpenStreetMap. I created bus station points on it and I want to create segments between each two successive stations, each segment with a start_station & an ...
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0answers
144 views

Shortest network to connect multiple points (Euclidean Steiner Tree problem)

I have a shapefile (Houses.shp) with points representing houses in a village (from 10 to 40 houses per village). I want to connect the houses in each village to each other with the shortest possible ...
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1answer
45 views

pgr_drivingDistance How to split edge if max distance is reached halfway through the edge (PGROUTING)

I would like to generate a catchment within a network, up to a max cost, using the pgr_drivingDistance function. This returns all the nodes within this distance - but does not provide for partial ...