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

Constructing a weighted graph a.k.a. a road network with distances for a specific area

Pardon my ignorance in GIS/Routing tools as I'm new to it: I have a map in OSM format and wanted to build a routable graph out of it ( to experiment a searching algorithm I have in my PhD thesis). ...
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11 views

USA Road Network Data Set Options?

I need a contiguous, nationwide USA Road Network with speed limits, distances, etc. I have been using TIGER but the challenge is at state boundaries - where contiguous road segments are split. Is ...
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2answers
44 views

ArcGIS 10.3: How to merge lines divided by junction points?

I have one shapefile with train stations (points) from a region in the UK and another shapefile with railroad tracks (lines) between these stations. Problem is, in the latter I don't have a unique ...
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1answer
27 views

Selecting parallel line segments but not segments that intersect

I have 2 different shapefiles that each have railroad track on them. Most of the track being displayed is the same, but since it is coming from 2 different sources, the physical lines themselves are ...
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1answer
22 views

Problem when building network with spatialite-gui

I would like to find the shortest path between two points in the following graph and corresponding table: I am using spatialite-gui for windows version 1.2.1 and I am having a problem when ...
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1answer
40 views

Create an Origin - Destination map using roadnetwork layer

I am using Qgis 2.14.2, I am trying to create a O-D using the road network that I have in a feature. Is any way or plugin that can help me to plot 500 trips using as a path my road network layer? I ...
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16 views

Finding closest feature to known point based on road layer?

I am using ArcGIS 10.2, standard I have 3 files: Facilities Storage Road I want to find the closest storage location to our facilities based on the road layer. The spatial join tool doesn't ...
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0answers
18 views

Automating the Road Graph “shortest path” plugin in QGIS to batch compute routes

Is anyone aware of how to automate the Road Graph "Shortest Path" plugin in QGIS, calculating multiple routes from multiple origins to multiple destinations, using two point files and road network, ...
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0answers
29 views

QGIS Broken Link to files on a server

My colleagues and I are using different versions of QGIS (2.8.2, 2.86 & 2.14) on windows 8.1 and Windows 10. When we open existing projects we get a "Handle Bad Layers" box coming up. We have ...
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0answers
46 views

Looking for an algorithm to quickly find the closest point on a road network (or other graph)

I am looking for a fast algorithm that will find the closest point on a line segment in a graph (such as a road network) to my test point. I'll try to be more specific. I have a road network graph. ...
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17 views

Qgis network prepare road graph

I have been working on finding shortest path between two buildings. For that purpose i have created kml files of various streets, converted them into shape files and then merged all of them together. ...
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1answer
15 views

QGIS, Calculate networks first, diameters second

I need to get the following task done: First, various points (stored in a shapefile, identified by a common attribute) need to be put into relation with each other (see graphical scheme, steps 1 and ...
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1answer
44 views

Expand Street Network passing through points using QGIS?

I have a road network (red) passing through some traffic data points (green): I want to expand this network to include all of the points. I already have a bigger street network (blue) from which I ...
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36 views

Calculate shortest paths for each output area in catchment through road network to a single point (i.e. store)

The title sums it up pretty much. I'm looking to derive trip distributions to a single store using population data and distance within a prescribed distance catchment. I have calculated the catchment ...
2
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1answer
125 views

How to use the Grass modules v.net.xxxx from within QGIS

I'm trying to create a an area that can be reached within a certain amount of time/distance from a single (or multiple) points. To do this i'm using the GRASS tool v.net.iso (via the GUI). I've ...
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4answers
137 views

PostGIS query for selecting features not connected to rest of road network?

I have a dataset of roads in a city stored in a PostGIS enabled database. I would like to identify and remove any feature which is not connected to the rest of the road network. This behavior is ...
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1answer
27 views

ArcMap 10.1 Create colored lines from one layer to another based on common field

I joined a points layer to a polygon layer. How can I draw lines from a one-to-many polygon to points? I don't have Business Analyst extension so I don't think spider diagram is the right tool. Also, ...
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0answers
16 views

QGIS-streets network: How to get the points equistant at a certain distance from one point given?

Into a network of streets (let’s suppose polilines or polygons): How to get the points equistant at a certain distance from one point given? I know how to do this with ArcGIS with Network Analyst ...
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0answers
20 views

Nominatim installation - network flood

I've tried to install Nominatim with a planet.pnf file to a server which is hosted at Dacentec(36gb ram, 16 threads, 1x2TB 7200 RPM hard). The installation was going well, it was already indexing data ...
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0answers
40 views

Roadnetwork_merging [closed]

I have a shapefile of a road network which has two lines to represent the two-way directions. My attribute consists of "fromnode", "Tonode", "length", "One-way" (every cell has a value of one here, ...
3
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1answer
59 views

QGIS: sewer system symbology

Is there any symbology set out there for sewer systems or other piped networks? The sort of elements I need to represent are: Conduits Junctions Pumps Weirs Outfalls Gates etc... There are few ...
2
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1answer
57 views

Creating isochrones in ArcGIS for Desktop?

Is it possible to create isochrones (lines of equal travel time to or from a certain point) in ArcGIS? I have a street network, with the streets having a speed limit attribute, and I need to create a ...
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0answers
39 views

Network Analyst line barriers have no network location?

I am using ArcGIS Network Analyst to calculate a route between two points on a road network. I have added a number of scaled cost line barriers but no matter how I mess with the settings, solving for ...
2
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0answers
100 views

Global shipping network datasets for download?

Does anyone know if global shipping routes for free download (preferably ESRI shapefile) exist? I would need them for my research only as a background presentation on the world image. They can be ...
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0answers
21 views

Convert a polygon grid into an edge table

I'm working on a robotics project. I've got a rectangular grid (polygon shape file) that is a navigateable/routable region (i.e. I can travel anywhere in this grid). That is I took my bounding area ...
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26 views

Build network based on shortest distance between points

Is there a way to build a network based on the shortest distances between each point of a point layer. I have occurrence data from species (as points) and want to estimate whether there are one or ...
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39 views

Create network graph from contiguous polygons in KML, or PostGIS?

I am using Postgres 9.5 and PostGIS. I have a table with a geometry field. This table has about 200 rows, in each of which the geometry field contains a Polygon. I would now like to derive an ...
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58 views

Create matrix measuring distance from each point to every other point along polylines

I'm working on a project involving ancient trade routes. I have two datasets: 1) -Nodes (around 1000): Every node has a nodeID, lon, and lat 2) -Arcs (several hundred): contains a record for each ...
2
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1answer
31 views

Can I use Mapbox to create a web form that finds parks near a location?

I have run a network analysis in ArcGIS and have all of the trimmed polygons along roads within a half a mile of a park. I need to find a way to create a web form that takes in an address and spits ...
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0answers
34 views

Buffer for network roads in QGIS [duplicate]

How can I create "buffers" or vector from values ​​from a layer of points, where the "buffers" are "tied" to the streets? Example: A bus station, I would like to create vectors within 100 m range ...
3
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0answers
39 views

Calculating a specific distance from points along a network - GRASS

I'm currently using the v.net.iso function in GRASS (no access to network analyst in ArcMap). Does anybody know of a way to export the result to shapefile so that you have an individual line ...
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1answer
20 views

Any standards for urban rainwater drainage network?

I am starting to work on a project related to urban drainage networks. Are there any standards out there to represent this kind of network? Relevant attributes would be things like pipe section, pipe ...
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25 views

Live GPS tracking with both ping script

That's a professional context : During a travel between two train station, I would like to use the live tracking and analyse the network performance (access by Wifi & 3G/4G ). I would like to ...
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0answers
35 views

Geoserver VM with NAS, Should I store entire VHD on the NAS or just map the data directory? Or just go with internal SSDs w/ weekly backups?

Our humble geoserver instance needs to be able to host GEOTIFF image pyramids ranging in size from a few gigs to a few TBs. A NAS appliance with raid 10 seems smart from a maintenance/expandability ...
4
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2answers
177 views

Road segments reconstruction from GPS trajectories

We have a 10,000 base of vehicle mounted moving devices which report their GPS position on a time based schedule. All that data is currently being stored in our database for several business related ...
3
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1answer
40 views

Get upstream sections of a network

Is there any extension to get all upstream sections of a polyline shapefile which represent an hydrographic network in QGIS? It could work like this: you choose a specific branch and a direction ...
1
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1answer
41 views

Navigating a road network and avoiding u-turns

I've implemented a node-based A* search of a road network graph. I would like to penalize u-turns a places where bi-directional streets join together again, which I identify successfully via a match ...
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0answers
17 views

Nested Set Model for Spatial Data?

How can I create a nested set model for a spatial line dataset? The nested set model is a technique for respresenting hirarchies of a tree (see https://en.wikipedia.org/wiki/Nested_set_model). If ...
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0answers
26 views

“Merging” 2 layers of LineString with splits at intersections

I would like to "merge" 2 networks of lines and these lines need to be split when they intersect. With pictures it should be clearer : What to do: if a black line intersects a red line, they ...
2
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0answers
60 views

How to calculate shortest path from points in one layer to points in another layer via roads, in QGIS

I'm a new user of QGIS (and have experience using ArcGIS but zero programming skills) and I'm looking for a way to calculate the shortest path from addresses to subway stations via a network of roads. ...
0
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0answers
18 views

How do I add a fixed cost for switching modes in network analyst? [duplicate]

I am constructing a multi-modal transportation network using Network Analysis in ArcGIS. I have data on roads, railway, and rivers. My goal is to calculate an Origin-Destination matrix of the cost to ...
1
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0answers
37 views

Adding multiple values restriction field for service area analysis using ArcGIS Network Analyst?

I have a network dataset created and I am trying to run a service area analysis for pedestrians/cyclists movements. The network is comprehensive of pedestrian paths, cycle lanes and roads as well, so ...
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0answers
53 views

How to find NetworkAnalysis extension with ArcObjects?

I'm using ArcGIS 10.0 My code: IAoInitialize init = new AoInitializeClass(); var a= ...
0
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1answer
69 views

Can you create a square OD Cost Matrix with Network Analyst?

I have a feature dataset and want to find the cost of travel between each pair of features. Because I'm looking for road (not Euclidean) distances, I was told that the OD Cost Matrix solver in Network ...
2
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1answer
53 views

Network generation algorithm

I am trying to solve a network generation problem, and I'd be happy about inputs. First of all, my problem description: I have a list of connections between locations with respective distances. For ...
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1answer
33 views

Does ArcGIS Online include High Speed Rail in its network analysis?

I'd like to run an OD Matrix using network analyst in Europe and Asia to study high speed rail. Does ArcGIS online include HSR (such as the AVE in Spain or the TGV in France) in its analysis?
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44 views

Water main Flushing

I am trying to make a basic network on which I can derive some watermain flushing routes (similar to the software InfoWater UDF). Watermain flushing depends on closing specific valves to direct water ...
3
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1answer
206 views

Calculating shortest paths from all points in one layer to any points in another via road layer in QGIS?

I'm trying to calculate the shortest paths from all the points in a layer representing population settlements (the green points) to any of the points in another layer representing the hospitals ...
2
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1answer
72 views

Reproducing GRASS GIS network analysis tutorial in QGIS Field Calculator

Im looking to reproduce the assigning of road speeds as denoted in a GRASS GIS tutorial (v.net.alloc tutorial), where the road speed is assigned by road type (i.e. 'interstate' = 75 mph etc.) to then ...
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1answer
92 views

Update values from layer one to layer two where there is no identical ID but identical geometry

I have one huge problem and that is to get the value from one layer into another. It is a network with over a million links and I need to update a table from a layer of + 100 000 links. I am using ...