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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91 views

How to assign node IDs to links in a network?

I have two shapefile layers in ArcGIS for Desktop 10. I have one line layer and node layer. My node layer(shp) has a "code_1" field and line layer has a "code_node" field. The intersection point ...
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1answer
43 views

How to make pgRouting understand bridges and tunnels?

I have I highway that runs on a bridge over a couple of blocks in a city. How do I get pgRouting to understand that cars can't move from the small blocks on the ground up to the highway on the bridge ...
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2answers
87 views

How to develop a fastest road website?

I need to develop a website to find the fastest road between two points (just like google map) What kind of technologies I need to use? What are the components of this project (database, website, ...
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1answer
135 views

Network Analyst does not take oneway street from attribute table

I want to build a network dataset to calculate travelling times for buses (service area). I have on shapefile with the streets from my home town, which has a column intitled 'ONEWAY', with values of ...
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1answer
175 views

ArcGIS 10.1 Network Analysis- How do I get appropriate network dataset?

I have acquired London road dataset from the Open Street Map however after creating and building the network dataset in ArcCatalogue the solve tool could not return the routes because of errors no ...
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1answer
336 views

Creating routable network table in PostGIS

I am trying to create the routable network table, as per http://underdark.wordpress.com/2011/02/07/a-beginners-guide-to-pgrouting/. Everytime I do it in PostGIS extension, QGIS crashes. The area is no ...
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2answers
98 views

Error using Grass v.net

I'm trying to connect my network to a points layer with a threshold of 4500 meters. I have about 11000 or so entries in my polyline and about 24 in my points layer. I have alreday used v.distance, ...
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1answer
446 views

Create a Minimum Spanning Tree based on a street network (ArcView)

I hope you can help me with my network analyse problem (ArcGIS 10.0 SP2 - ArcView License) Background: I try to create a network of fiber optic cables to specific points along a street network. ...
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1answer
1k views

How can I calculate driving distance between 2 lat/long points

I want to build a .NET application that can get an input of 2 lat/long points and return an output that specified the driving distance between the points. Appreciate suggestions for API's or methods ...
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0answers
24 views

What can I do in qgis to manage a WMS frequently unreachable?

In my project I have a layer linked to an external WMS server (provided by a local institution). The problem is that it is somewhat unreliable: it is down rather often. Is there something I can do to ...
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0answers
45 views

Network trace using attribute as a stop/barrier - ModelBuilder

I have two point datasets, one to be used as the flags(starting point) that i'll call dataset A and one as the barriers(stop point) that i'll call dataset B, in the trace(downstream) tool. In each of ...
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70 views

how to add polylines(routes from public transport) on postgresql(pgrouting) with GUI

After searching a several long time... i decide to ask here for help, im currently using ubuntu 12.04(because of compatibility) with postgresql 9.1, postgis2, pgrouting2 and qgis2.2 i need ...
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1answer
56 views

How does the tolerance influence QgsGraphBuilder and tieing of points?

I am developing a script which uses OpenStreetMap data to calculate the distance (over the road network) between each building and the nearest hospital. To do this, I mainly follow the official ...
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0answers
68 views

Traversing all possible road routes

I have created a topology from OSM data and would like to simulate a car driving every possible route along the map. The purpose is to "survey" the osm data as if in a car. My ultimate objective is to ...
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0answers
101 views

Drawing a road network: offsetting overlapping lines (directed graph)

Say I have a road network defined by a table, indicating, for each arc, its ID, and its head and tail node. In other words, my network is defined as a directed graph. For example, we have two points, ...
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1answer
66 views

Creating a point buffer along a road network [duplicate]

I have a road network and have added points indicating fire hall locations. How would i go about creating buffers on those points following the road line. The result am i looking for would create a ...
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0answers
28 views

Time attribute problems with Network Analyst

My network dataset is in a geographic coordinate system, and when I project into UTM to calculate Miles for a length field to use with my Speed Limits to create a time attribute it does not seem to ...
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0answers
85 views

SQL procedure(s) to convert GPS traces to an ordered set of junctions in a network

I have three datasets that I have loaded into a geodatabase (spatialite or PostGIS): A set of GPS points collected from individual trips through urban areas. Points have a unique point id, a group ...
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1answer
35 views

how to extract network of city routes from city blocks shape file?

I have a shapefile which contains urban blocks. So, I am going to extract network shapefile of city routes and calculate total length of network arcs. I am using arcgis 10 for this work. Is there any ...
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1answer
86 views

Find directly joined neighbour points using a different line layer in QGIS

I have two layers of data: A set of points showing every significant point on the UK rail network (Network Rail Stanoxes). These are a mixture of stations, junctions, timing points and signals. An ...
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0answers
38 views

Deleting network features in python script doesn't create net junctions

I have a script that makes a copy of a network dataset for a 3rd party app to use. One of the junction feature classes causes problems with the app. The ideal solution would be to remove it from the ...
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1answer
94 views

ArcView: Trim polyline, that is shorter than specific dangle length (alternative to tool: Trim Line)?

I am looking for a way to trim dangles from a polyline shape, that are shorter than a specific length like the Trim Line Tool for ArcEditor and ArcInfo, but with ArcView-License. I already discover, ...
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0answers
108 views

Calculating walking routes along a network(ArcGIS)

I've created a network consisting of footpaths, dirt tracks and junctions. I would like to calculate a route using network analysis by giving ArcMap the time and walking speed that the route should ...
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1answer
56 views

Clipping without cutting features

I want to create a multimodal network dataset for the city of Montreal. I have roads and transit lines features for Quebec province (where Montreal is). Because I need the features limited to Montreal ...
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0answers
130 views

Map Matching? (Finding Nearest Roads…)

I am making Pedestrian Navigation System for my school I created node and arc and digitized buildings with ArcGIS. Then, exported KML to use Javascript Dijkstra's Algorithm to find route. So far, so ...
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1answer
83 views

Basic traffic volume map [duplicate]

I'm trying to map the volume of people traveling from various cities to popular mountain towns in British Columbia. I have a .csv containing the starting point, ending point and number of travelers. ...
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2answers
145 views

Merge Multipart Feature Line

I'd try to merge multipart feature line, but didn't work. would you please teach me how to merge multipart feature line? I work in version environmental and geometry network. Regards,
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58 views

Stopping the automatic snap to locator in Arcgis 10.0 reverse geocode

I built a network application using arcgis 10.0 sdk for wpf. The application uses a locator of highway milestones to reverse geocode (and identify) the "flag" the user clicked on the map. My Problem ...
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1answer
295 views

Retrieving XY from point graphics set in WPF network (arcgis 10.0)

I have a WPF application using ArcGIS 10. In the application I can set two point by clicking on map and calculate route between them. every time I click on the map, The application creates a ...
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0answers
110 views

how to set in arcgis network analysis that use every road segment max m times? [closed]

excuse me if my english ins't good. I have one incident and 120 facility. i wanna set criteria in Arcgis network analysis that if any road segment used for example m times, for other route doesn't use ...
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250 views

Open Network Dataset with ArcObjects SDK 10.0 .NET

I develop desktop standalone application and use this code to open Network Dataset, but it fails with HRESULT on datasetContainer3.get_DatasetByName(). public static ...
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2answers
206 views

how to build a routeable network for pgRouting with srid 3785

I'm following the pgrouting-workshop http://workshop.pgrouting.org/chapters/topology.html and It works, but in my project I'm working with the mercator projection(srid 3785) and there is not a routed ...
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1answer
66 views

Adding additional nodes to network in Grass GIS

I have created a network in Grass GIS (using v.net, nodes option). I then want to "disrupt" the network (i.e., create some road blockages) and add in nodes to the new line ends where road blockages ...
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1answer
58 views

GRASS: Loss of data using v.net

I'm trying to build a network in GRASS in order to find the shortest path from any settlement out of 1120 (points), to one waste treatment facility out of 27 (points). I plan to use v.net.distance ...
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1answer
175 views

PostGIS Implementation of Brabyn and Skelly Road Network Travel Time Model

Is there a PostGIS implementation of the Brabyn and Skelly road network travel time model for the New Zealand road network? This model is outlined in: Brabyn L, Skelly C. Modeling population access ...
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16 views

calculate distances between different components in a (cable-) network

I have to calculate all distances between every different components in a cable network (for example the distance between an amplifier and a modem) and have to show the results in a diagram (frequency ...
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0answers
145 views

QGIS 2.2 problem, loading layer into road graph

I have the road graph plugin installed, but when I try to configure it with the Settings dialogue, no layer names appear in the Layers field. I have tried various shapefiles, but the Settings dialogue ...
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0answers
15 views

Why don't my service area polygons follow my network?

I have found a few similar questions, but no good answers, so here goes another Service area question: I'm working on creating a walking distance layer from Parks, and have a road network set up with ...
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0answers
18 views

problems using GRASS v.net and v.net.allpairs

I am using GRASS 6.4.3, and I am trying to use it to do network analysis. I have a line shapefile and a point shapefile, and here is my code(I take v.net.allpairs as my reference): v.net tc_bf25 ...
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0answers
9 views

problems using v.net.allpairs

I am using GRASS 6.4.3, and I am trying v.net.allpairs to do network analysis. I have a line shapefile and a point shapefile, and after I use v.net.allpairs, I type the command d.vect network, and I ...
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0answers
25 views

Topology rules for a 3d network

I am currently writing a spec to which people may end up using to guide the digitization of a large 3d network (exterior pedestrian network + building interiors). In 2d network drawing, it seems to ...
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0answers
14 views

How to add a road to a network dataset

I have a street network file, and I want to add a section of road to it. I start editing on the road network dataset, snapping on, create a new feature line road segment from the edge of the old road ...
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3answers
57 views

UK road network dataset

Can anybody guide me to a website or a source to download the Geographical UK road network data set. The data set should include the road distances, since I want to apply shortest path search ...
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1answer
45 views

Analysing a network distance to two or more points using GRASS or QGIS

I am doing a piece of analysis work looking at distances along a network in GRASS. Most of the analysis involves finding which parts of the network are within 600m of a series of points. GRASS does ...
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0answers
24 views

How to turn this into a routable network that works with pgRouting? [duplicate]

I'm only asking again since I didn't get any answer and I'm still stuck here... I updated my last question with more info, but it wasn't answered. When I draw a line with snapping enabled and try to ...
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0answers
62 views

Network Analysis-shortest combined distance to one point

First let me confess I have little experience doing network analysis so I assume I know nothing (in essence approach me like my girlfriend does). Anyway, I am attempting to solve what I believe to be ...
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1answer
269 views

How to build a Spatialite road network from OSM data

I'm looking for algorithm which could help me with building my own road network (for routing) from OSM data. I chose Spatialite DB for this, but here I have only one problem: Spatialite provides ...
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1answer
59 views

SpatiaLite: Creating to, from nodes from a normal road layer (LINE)

Following this tutorial but using my own data. How do I create the from_node and to_node columns? I am using Spatialite and Sqlite3. I'd prefer to not use a gui as I'm working remotely via ssh on a ...
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0answers
156 views

How to Calculate Shortest Path Routes for Multiple Start and End Points?

I'm new to QGIS and was wondering, is there a way to calculate shortest paths along roads for multiple sets of points? So basically what the roadgraph plugin does but for a series of start and end ...
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0answers
30 views

How to access layer attributes using grass network tools (v.net.iso)?

I had a quick look for a similar question, sorry if this is a duplicate. I am using GRASS 6.4.3 on windows - osgeo4w version I ran v.net.iso to split my road network by cost however when I try to ...