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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32 views

Why outside border of a service area is always not reasonable?

In ARCGIS 10.1 network analysis, why results of service area are different if number of break points is changed? For example, the grid is 300m*300m, I try to produce service area around a node. ...
2
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0answers
609 views

How to specify cost attributes for network analysis in QGIS using the GRASS plugin?

I have a road dataset with information about the length, speed and drivetime for each segment. I use QGIS 1.9 with the GRASS plugin to do different types of network analysis, but how do I set up the ...
2
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1answer
158 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
183 views

Plot the Shortest Paths in a Grid without any clash at a point of time

The efficient algorithm needs to be done and proved for the best solution for the given problem: User inputs: (#) Size of the NxN Grid. (N); (#) No. of Paths: Z; (#) Source and Destination ...
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3answers
375 views

Creating network datasets from OSM data in QGIS?

I am having a difficulty to use network analysis in ArcGIS because of unavailable network datasets. So, I googled it and realized that it is possible by using OpenStreetMap. However I don't know how ...
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2answers
173 views

Suggest an algorithm to measure how a node is connected to road network

I try to measure how well a node is connected to the rest of the network. If a city has a distant suburb connected with one sole road, it's connectedness is, say 1. If it's connected by 2 roads, it's ...
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1answer
67 views

ArcGIS Online Network Service

Where does ArcGIS Online Network Service source came from? Is there any source reference I can refer to? I tried to search on Google but I could not find anything.
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2answers
80 views

Distance between two points in a line feature

I have two layers, one with lines and the other with points. Layer one has all the points (A to J) as shown below and layer two has all the lines connecting these points. Is there an automated way (in ...
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3answers
196 views

Filtering polyline features by direction using ArcGIS 10.2 (or ArcPy)

I have a polyline shapefile depicting a real road network. In many parts it has two 100 % overlapping segments in opposite directions, representing the two driving directions (In picture: red segments)...
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2answers
187 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
230 views

Geometric Network Find Upstream

I am New to Geometric Networks. I need to build a river network and find all locations (polygons) upstream. This is the template I am trying to use. I have my rivers with to and from node and the ...
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2answers
75 views

Simple way to share maps on a network drive?

I am not an expert in web GIS and I would like to share some maps I created with non GIS aware colleagues from other offices. I have looked at various options but I can't find one that suits my needs. ...
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1answer
45 views

Setting junction properties in ArcGIS Desktop?

I have a situation where I have a line feature class and need to build a network out of it. The lines represent roads. I wonder how I can model the intersections on the network. Almost all of them ...
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1answer
299 views

Unable to access GeoServer from another computer in the same domain

I installed GeoServer 2.5.2, GeoNetwork 2.10.3 and Tomcat 7 on my Windows 7 computer {MyComputer} in our company's network. Now I would like to access GeoServer, GeoNetwork and Tomcat from other ...
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3answers
939 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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1answer
84 views

Using Copy Traversed Features to count turns for a route result in Network Analyst

I have the output of the route layer. And I want to determine the number of right and left turns for each route. For that, I used the COPY TRAVERSED ROUTE FEATURES tool from Network Analyst. However, ...
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1answer
42 views

How to compute drive access to a station based on vehicle origin points? [closed]

I have a shapefile that contains station locations and another shapefile that is the geocoded origins of those who drove to the station. I would like to make a buffer around the station that shows the ...
1
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1answer
132 views

Infrastructure networks in GIS modelling

I am currently working on a GIS-based project which aims to model the interdependency of existing infrastructure networks, e.g. transport, oil, pipeline networks, etc. The network interdependency ...
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1answer
780 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
430 views

How to create routable network by pgrouting with assign_vertex_id?

I'm trying to create the routable network as per http://underdark.wordpress.com/2011/02/07/a-beginners-guide-to-pgrouting/and use assign_vertex_id. Do I still need to create the node table? How would ...
1
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1answer
228 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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1answer
1k views

Create closest point on multilinestring to use in shortest_path()

I am working a routing based application where I need to create a route between two points of interest. The problem which I am facing occurs after calculating network topology using assign_vertex_id()....
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1answer
30 views

Joining attributes of two line feature classes (street network, ArcGIS)

I have two line feature classes for a street network. Their geometries are only crudely similar, while their attributes are different. I am trying to add the attributes of one feature class to the ...
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1answer
26 views

How can I get QGIS Plugins to work through the proxy internet settings?

For QGIS on my work computer, I add in the appropriate information under Settings - Network - Proxy. This allows me to access plugin repositories, but sometimes plugins do not work. I would get '...
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1answer
43 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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1answer
55 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
17 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 2)...
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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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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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1answer
46 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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1answer
68 views

PgRouting: Target vertex error

I'm trying to make a matrix that shows the cost from a node to the rest of the nodes in a network. The final result I'm looking for is not the cost, but only know if a car can or can not reach each ...
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1answer
59 views

Best way to filter points given a starting point and max travel time

I have a database of about 1M geolocated addresses and I'm looking for a way to sort/filter these records based on a starting point and max travel time. Ex: "find every baker shop within 30 min ...
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1answer
88 views

Python script to accumulate flow volumes for a pipeline geometric network

I have a point wells layer and a polyline pipeline layer. The wells are snapped to the end of the pipeline segments. The wells layer has weekly updated flow volumes and I'd like to find a way to ...
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1answer
72 views

Once route is solved, also return encountered barriers from ArcGIS Server Network Analysis?

I have came across an unexpected "issue" while working with the Esri JS API and ArcGIS Server Network Analysis service. Once user submits the route solving task to the server, I'm appending the ...
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1answer
265 views

How to find the best location to put a facility within network so that all points are near a facility?

Suppose I have many points distributed in a network. I want to place three facilities in the best way so that all points are near a facility. How can I do it? Any solution and software should be fine ...
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1answer
73 views

Is it possible to make stops not in a certain sequence in order to find the shortest route with the network analyst?

Is it possible to make stops not in a certain sequence in order to find the shortest route with the network analyst? I now use the small green points as an input stops because I want the lines with a ...
1
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1answer
138 views

How to create a routable network with PGRouting

I have two sets of data Table A: Stations - contains postal code (which I can convert to lat/long), name and code. Table B: Connections - contains a possible list of connections including source, ...
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1answer
107 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 ...
1
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1answer
1k 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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2answers
95 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, etc)?...
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1answer
328 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
881 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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0answers
9 views

Switch QGIS proxy settings programatically

I am using QGIS at two offices with different proxy-servers. At the moment I have to change the proxy settings manually every time i switch the office. I was wondering if its possible to change the ...
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0answers
19 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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0answers
83 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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0answers
23 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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0answers
51 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 ...
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0answers
17 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
21 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
23 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 ...