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.
3
votes
1answer
360 views
Is there an open source tool for both road network analysis and geocoding?
Is there any one open source software package that can perform both road network analysis and geocoding?
4
votes
3answers
370 views
How to find the watershed for each outlet point and sum values within it?
I have the following files to work with:
Stream network of a basin;
Outlet points for each segment* of the network and
Points which represent water withdrawals along of the stream, which are not ...
6
votes
1answer
227 views
calculate slope for a road network
I am working on a road network for routing operations using postgis and QGIS.
I am new to both of these tools and need to calculate the slope for each edge (by retrieving the Z value for the start ...
1
vote
1answer
262 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.
...
8
votes
2answers
264 views
Generate near table for x number of neighbours using arcpy
There are 3 likely scenerios that I am trying to capture near distances for:
An interchange subway station, which has 2 or more neighboring stations. That is, the station in question connects 2 or ...
4
votes
2answers
391 views
Which are the best open source tools/solutions for digitizing road networks?
I was thinking on tools/plugins for QGIS, but other good suggestions are welcome.
0
votes
2answers
139 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 ...
1
vote
1answer
366 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 ...
1
vote
0answers
84 views
how to set in arcgis network analysis that use every road segment max m times?
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 ...
1
vote
0answers
173 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 ...
3
votes
1answer
224 views
Is it possible to use Python to perform network analysis on only part of a network?
I have a large network dataset and want to perform an analysis on it which would output the start/end point, the distance between them and whether they're first, second or third (etc.) nearest ...
5
votes
1answer
439 views
Geometric Network - Listening to network feature connection changes in the IObjectClassEvents::OnChange event
I need to be able to tell when a particular type of feature, that participates in a geometric network, is having its geometry automatically modified due to the geometric network.
What i mean is that ...
2
votes
1answer
164 views
Sources for California roads data
I need a California roads network suitable for building a network dataset and routing to 120 locations. It needs to at least cover the Northern half of California. 2010 Census roads need alot of ...
2
votes
1answer
249 views
Need to programmatically create Barriers in my Network Dataset
I have the following C# code to create a Network Dataset layer that I can bring into ArcMap. However, even though I am able to create a Route from the ND, I am not able to create Barriers of any kind ...
2
votes
1answer
374 views
How to integrate every single street into a network analysis?
This is my first question, but I solved problems before thanks to this great community!
It is also my first time working with a network analysis (ArcMap 10) and there are some problems which haven't ...
2
votes
1answer
629 views
How to populate From Node and To Node fields for a polyline feature class? (ArcGIS 10)
I need to populate FNODE and TNODE fields for my roads dataset. I have an intersections point feature class that has unique ids, and I need each road segment to have an FNODE and TNODE value that ...
3
votes
2answers
150 views
Need an explanation on a network simplification algorithm
I try to implement the algorithm described in this paper (page 8), but there's a place that I can't understand, and the authors do not provide a more detailed explanation or pseudocode.
They show how ...
18
votes
8answers
3k views
Alternatives to pgRouting
I was wondering if there are any alternatives to pgRouting tools.
Thinking about it for a bit, I think the only alternative is to use R or RPY to do the analysis.
Basically I'm trying to solve ...
6
votes
2answers
1k views
Segment road network line shapefile into new equal length segments line shapefile
I would like to subdivide a road network for an entire state into segments of equal length. So, Highway X would be divided into 0.5 mile segments, with a record for each segment, and Highway Y would ...
3
votes
2answers
345 views
Design fiberoptic network in QGIS?
I'm a GIS newbie trying to design a fiberoptic network in QGIS. What I'd ideally need is to draw lines on top of a map or orthophoto, assign a name/id to each line and a type. Get a list of all the ...
2
votes
0answers
198 views
How to create a service area using both streets and buslines in the same network?
Hello,
I want to create a network analysis more difficult. Therefore, I want to calculate a Service Area around hospitals next to busstops. But: The network does not only consist of roads and ...
9
votes
3answers
1k views
How to connect lines in a network?
I have a shapefile of lines and another of polygons. When two or more lines intersect a polygon they should be connected (snapped), but sometimes during manual digitization this doesn't occur. I need ...
3
votes
0answers
373 views
IDatasetContainer2 CreateDataset method fails after upgrading to ArcObjects 10 [closed]
I have a Network Analyst routine that worked for 9.3 and does not work with 10. I was closely following the example at:
...
3
votes
2answers
119 views
LRS schema error in Oracle SDO_NET when validating network
I have a problem with the Oracle Spatial Network package. I'm creating NODE, LINK and PATH based on LRS. When I try the call:
SELECT SDO_NET.VALIDATE_NETWORK('network_tracking') FROM DUAL
then I ...
6
votes
2answers
385 views
How do I select only those features, that are connected?
I have a polygon layer of water reservoirs and a polyline layer of canals.
In my data, some canals are originating from reservoirs, and leading to other canals. On the other hand there are some ...
3
votes
2answers
294 views
How do you get access to a Network Analyst layer item in ArcPy?
I have a Python script that I'm working on. I have created a Closest Facility layer (in memory). I add facilities. I add incidents. I perform the Solve. These all complete. The only problem is, ...
5
votes
1answer
327 views
Is there an open source tool to planarize graphs?
I read about the planarize function in ArcGIS, which seem to do exactly what I want. Is there a similar feature in QGIS or another free tool?
I have a shapefile with various shapes intersecting each ...
1
vote
1answer
784 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 ...
5
votes
2answers
798 views
Are there any open source network analysis tools?
A researcher in my field* recently created an "Urban Network Toolbox", an ArcGIS extension built upon Network Analyst. It calculates a number of measures on urban networks, such as betweenness and ...
12
votes
3answers
580 views
PgRouting - How to clip links when reaching max costs?
I have a polyline shapefile representing a road network and a second shapefile containing points. I would like to use PostGIS (presumably PgRouting) to identify sub-networks or service areas radiating ...
8
votes
1answer
234 views
Large survey on unconnected underground networks
We (read I) are currently surveying all the stormwater pits and pipes in our shire, and have run into a few issue with handling unknown network connections. The problem is that a lot of our network ...
4
votes
1answer
589 views
How to find network distances between two sets of origins and destinations?
I'm learning how to use Network Analyst, and I'm not entirely sure what to do (or search for). My objective is to measure the nearest distance from the red circles to the blue circles along a road ...
4
votes
1answer
557 views
How to generate a point distance matrix using shortest network distance?
My problem is as follows.
To start with, I have the following spatial datasets:
A road network;
13,000 odd point locations representing populated localities (ie places where people live);
Service ...
10
votes
3answers
538 views
How to simplify a routable network?
I have a network graph that I need to simplify in the sense of reducing the number of edges. The idea would be to merge nodes that are located close together and remove the connecting short edges.
...
3
votes
2answers
143 views
Can GRASS v.net.iso split between nodes?
Can GRASS's v.net.iso module split networks between nodes on the network, i.e., if I am finding the area within a cost of 400, and there is a line segment with a cost of 800 leaving the center node, ...
3
votes
1answer
464 views
Network Analyst hierarchy routing issues. (ArcMap)
My friend and I have created a walking network. We created a network without a hierarchy evaluation and the routing worked fine, but when we added a hierarchy to the equation many routes won't solve. ...
7
votes
5answers
2k views
Which tools and methods can be used to create isochrones?
I'd like to get an idea for what's involved in creating isochrones for a series of sites, with a reasonable degree of accuracy to the estimates. A general outline would be great, though my scenario ...
4
votes
1answer
478 views
Stream Gradient - Assigning points to their respective Reaches
This is a continuation of the question I initially posed here.
Also, I've attached a shapefile on my db account here.
I'm trying to break a stream network up into 100m reaches, assigning elevation ...
7
votes
3answers
910 views
How to compare 2 polyline datasets?
I have a network data set for footpaths which I have generated through the collation of path networks from a variety of sources.
I want to compare this with another dataset which also contains a path ...
8
votes
1answer
1k views
Difference between network dataset and geometric network
In ArcGIS, what is the difference between a "network dataset" and a "geometric network"? Are there differences with what can be done with each?
14
votes
3answers
1k views
Network Analyst - Is it the only choice?
I'm not sure how reasonable this question even is, but it leaves me no less curious after a bit of searching. If I am looking to build a network based on road features and attributes, is Network ...
3
votes
0answers
152 views
Three Dimensional Routing Input Location Errors and Questions, ArcGIS10
I am having a bit of a problem with my three dimensional route solving. I am creating an interior building network, and ideally would be routing from room to room. I created a line feature class, with ...
22
votes
7answers
2k views
Representation of network flows
This is a sample transportation network flow I've done a year ago based on 26 zones.
For a project I'm working on now, I need to represent the flows over 1,000 zones with directionality.
Any ...
5
votes
2answers
368 views
How to sum an attribute of a feature in a network along a route? (ArcGIS Network Analyst)
In the walking network that a friend and I are creating, we want to calculate an overall safety rating for each route. Each segment of our walking network has a certain safety value. We have ...
2
votes
1answer
601 views
Is there a function or tool that will add vertices to polylines where endpoints are snapped to edges? (ArcMap)
My friend and I are creating a walking network, and we have been having issues getting the routing to work. We just realized that the reason why our routes are messed up is because we snapped our ...
4
votes
2answers
402 views
How to include polygons as part of a network for Network Analyst (ArcMap)?
I am creating a pedestrian walking network of a downtown area. I am digitizing line segments for paths and sidewalks, but I need to incorporate parking lots into my analysis. So far, I have been ...
12
votes
4answers
980 views
What is the best method of visualizing a network on a map?
I have several hundred geo-referenced data points, and the relationships from that point, to other points. I'm trying to figure out the best way of visualizing this on an interactive map (possibly ...
3
votes
1answer
276 views
determine the closest points on the network?
In ArcGIS, I have only a point layer relating to a hydrography network's pour points. Now I want to write code in VBA that selects a point from this layer, then highlight the closest points to this ...
3
votes
2answers
227 views
Can ArcHydro Tools be used on a network in an SDE enterprise geodatabase?
Most of the documentation for ArcHydro Tools discusses their use on data in ESRI's personal and file geodatabases. Is it possible to use ArcHydro Tools to set network flow direction on a networked ...
4
votes
2answers
146 views
Transportation representation Standard on roads
Is there a GIS standard to display transportation specific information in GIS databases.
The information I'm interested in are:
Road Directionality
Center turning lanes
Ramps / Bridges / Over or ...
