A road is a thoroughfare, route, or way on land between two places.

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2
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1answer
25 views

How to find length of a discontinued line feature

I wanted to find the length of features in a road layer. So I go through each feature in the layer and used, line = feature.geometry().asPolyline() to find the points which particular feature is ...
3
votes
1answer
44 views

Calculating length of road network within a polygon [duplicate]

I have a road network stored in a gdb and some polygons in another gdb. I want to populate an attribute for each polygon with the total length (in km) of the road network that it overlaps. Any idea ...
1
vote
0answers
26 views

Routing and OpenLayers: How would you connect a point to another through a 'road' node? [duplicate]

So my question is in a routing application,probably using osm as base layer, how do I get a line-string that goes through the road and not directly from one point to another? Is there any ...
3
votes
2answers
67 views

Script for numbering roads based on Cardinal Direction

I am kind of new to python, and am attempting to write a script that will give me a unique identifier for roads based on the cardinal direction. Ultimatley, I would like to have a system set up such ...
2
votes
0answers
122 views

Create circles around a point on a map measuring the radius in hours

Disclaimer: I am not experienced in GIS and hope this question fits in this category. I was wondering whether it is somehow possible to create a circle* around a city, using Google Maps or the like, ...
1
vote
1answer
31 views

What's the best way to merge various road data into a single layer?

My company has two different road layers: 1) County roads 2) Old CAD roads Each with their own pros and cons. I'm attempting to merge these into a single road layer that will be maintained. The ...
1
vote
2answers
50 views

how to get a low level road network from openstreetmap data?

I've extracted the road network of a city from openstreetmaps (filetype: osm). One part of the road networks look like this: However, there are too many details in this data. I'd like to represent ...
0
votes
1answer
39 views

how to select line segments not overlapped by other layer's lines

I have two shapefiles of forest roads (mostly dirt) from different sources, covering the same area. The goal is to build one shapefile of roads that is the composite of the other two. Layer A is ...
0
votes
1answer
63 views

Drawing roads with different widths

I'm drawing roads with different widths. The road data is constructed using GeoJson. (Each road is represented with a LineString.) When I draw the roads with almost the same width, a trivial, direct ...
1
vote
1answer
69 views

How to calculate highway lengths using QGIS?

I need to create a network of highways in 8 states of the USA. Eventually, I need their length, the speed and if possible average daily traffic volume, I don't know how to extract this information. ...
2
votes
2answers
93 views

Why OSM data has different attribute values from the same element and same time frame?

Here is my question: Does anyone know why OSM has different attribute values from the same element and same frame time? The example explains itself, when I try the Shapefile from different mirrors ...
1
vote
0answers
70 views

Collapse dual carriageway lines in PostGIS

I have OpenStreetMap data, which represents larger roads (e.g. dual carriageways, aka divided highways) as parallel lines. The question is answered for ArcGIS or Skeletron here, for example using ...
0
votes
0answers
43 views

How to cut a shapefile using a batch?

I would like to cut a shapefile using a batch (like in the photo): But I have some problems because I don't know what do I have to put in field "extent" and after putting somthing like ...
0
votes
0answers
34 views

Why there is no output (path) for Dijkstra in pgrouting

I have a road network table and I am implementing pgRouting. everything was working fine previously but now there is something odd here. I am getting no route now. I am checking through sql query in ...
1
vote
1answer
46 views

How do I know what direction a road is drawn in OSM?

I'm trying to add a cycleway bike track to one side of a road, but I can't tell which side is left or right. The docs say "relative to the direction in which the way was drawn in the editor" , but ...
2
votes
2answers
131 views

How to populate fields for line segment with value from polygon to left and right of it?

I have a countywide roads dataset that is used by an emergency dispatch system. There are two fields, "Comm_RT" and "Comm_LT", that need to be populated by the name of the community polygon they ...
0
votes
0answers
46 views

I'm looking for an idea to calculate shortest path in a line Vector layer using a starting point

I'm looking for an idea to calculate shortest path time in a line Vector layer using a starting point in a qgis python plugin based on distance and speed. is there a solution where i can get ideas? ...
1
vote
1answer
69 views

How to split/divide linestrings of larger lengths in postgis

I want to split/divide linestrings in my data. I have roads data and I want to have every road segment having length not more than 250 meter. Check the shape length of this particular line feature. ...
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vote
2answers
74 views

Road-construction (alignment) tools

Are there any tools available in any GIS environment for route alignment? To be specific, the tool should take a DEM and road-construction parameters -- distance and gradient, roadfill, drainage ...
0
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0answers
33 views

Does a road connect one grid cell to an adjacent grid cell?

So here is the problem I am working on. I have an OpenStreetMap roadmap which I overlaid with a 2-D cartesian grid. So for a given grid square, I want to find out if a road segment continues from the ...
1
vote
1answer
455 views

Can't select layer in the Road Graph plugin QGIS

I'm trying to use the Road Graph plugin in QGIS 2.2.0. I have tried a few line shape files, but it won't let me select the layer (the option is greyed out). I've tried adding a 'SPEED' field and a ...
1
vote
2answers
84 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 ...
1
vote
1answer
136 views

How to build, store and index a road network from a digital city map

I'm totally new to this domain so my question may sound like a little bit silly…… I'm eager to know how to extract, store and index the coordinates of the road segments(edges) and intersections or ...
3
votes
4answers
117 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 ...
0
votes
1answer
160 views

How can I get clean road attributes from OSM data?

I would like to use osm road data for a project where I need to broadly distinguish between primary, secondary, and tertiary roads. OSM data seems just fine to work with Arcgis' Network Analyst. ...
2
votes
1answer
53 views

Isolating a street segment and assigning it a code

How should I go about making a map of alternate side of the street parking rules (in nyc?)? Does such a one already exist (I can't seem to find one)? If anyone is familiar with the transportation ...
1
vote
2answers
42 views

Linking data to road colour scheme

I'm getting started with a qgis map showing the quality of roads in my town. I have various data which create an index of 1-5. How do I link this index data to road data in a map, showing the bad ...
0
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0answers
52 views

draw route based on given nodes and existing line

this question is in relation with an application i m building for my project.I have a points layer having all major stations.I have a line layer having the road route connecting the stations.What i ...
5
votes
2answers
119 views

Select 90% matching attributes

I have a shapefile (.shp) of 180k roads with information of street name. I need to do a Dissolve on that road network to make only one feature per name. But I have a problem by doing that task ...
0
votes
1answer
55 views

Identify the direction of traveling road segment

I'm using pgRouting to find the least congested path using time as the cost metric. I am using average speed between two nodes to calculate time taken to travel in a segment. In pgRouting there is a ...
1
vote
2answers
125 views

How can I use arcgis server to help me find a street according to Latitude and longitude?

I am now in a project using a taxi GPS data(latitude and longitude ) to locate the road segment it is being on.I have the road map data. So, I wonder if I can use arcgis server to get the road segment ...
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vote
2answers
77 views

How to find out to which road each points belongs to?

I am new to GIS . I hava a folder it include a .mxd file and a .gdb folder, the .gdb folder hava many .gdbtable and .gdbindexes files etc, it's a road network data of a city. Now, I want to know ...
3
votes
3answers
836 views

Best way to assign points to nearest roads in postgis?

I'm trying to implement a simplified type of dasymetric mapping for census data. I've downloaded the Census's American Community Survey individual-level data and randomly assigned every household to a ...
2
votes
1answer
2k views

How do I determine if a road is privately owned or not? (USA)

I'm working on a project where it matters greatly whether or not a piece of land is on a private road or not. Google Maps in many cases takes private roads (in, for example, master-planned ...
2
votes
1answer
74 views

Northern Ireland Roadway Network shapefile

Does anyone know of an open-source alternative to the £7k+ offering in the Ordinance Survey map shop?
7
votes
4answers
255 views

Automatic matching of two street networks

I'm faced with the problem of matching two street networks. I have these two differently sourced networks. The links in each network can be segmented, i.e. there is not necessarily a single whole link ...
1
vote
1answer
104 views

MMQgis Plugin error in Qgis

I am using Qgis 1.9 .Just now I downloaded a plugin "mm qgis"But When I run this plugin I am getting following error: An error has occured while executing Python code: Traceback (most recent call ...
1
vote
1answer
57 views

Assigning an intersecting line length dependent value to a raster during polyline conversion

I am converting a road network polyline into raster format- my polyline shapefile has an exhaust emissions rate attribute which is in kg/km What I want to achieve is a raster that has (at say 5m ...
1
vote
2answers
89 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, ...
2
votes
1answer
356 views

How to get a city road network as line segments?

I want to have road-network information of different cities(New York for example) in the format of line segments(i.e. every road is represented by segment(s)). I want this for experimental purposes in ...
3
votes
2answers
272 views

How to extract all Way elements tagged as highways from OSM data using QGIS?

I want to extract/filter in all Way elements within a specific region tagged as 'highway' from an OSM file. I am currently thinking of using a Python library called osmread (by A Dezhin) that I ...
1
vote
0answers
57 views

Can't edit osm_roads in udig

There is a PostGIS database that has a road network imported from Open Street Map, stored in osm_roads table. For the testing purposes I need to change some road geometry there. I tried to edit it ...
1
vote
0answers
18 views

Alrign Track from GPX file with roads [duplicate]

I'm looking into possibilities to align track data from a GPX file with known roads, perhaps coming from OSM. So far I'm able to show the tack as such on a map powered by leaflet. Since the app ...
2
votes
1answer
880 views

OSM, Displaying a road with a line on a map from selected nodes

Along with a friend, we have started an educational side-project,for fun not as a commercial or trial software, to test what we have learned these last few months. We decided we would do a simple map ...
0
votes
0answers
213 views

Display colour coded road traffic data in QGIS

I would like to colour code a shape file containing road polylines to represent the heaviest flows of traffic. The shape file contains attribute data linked to each section of road where road traffic ...
2
votes
2answers
250 views

Identify points near roadside in QGIS

How do I create an attribute list from points that run along roads in a shape file containing road data? The points don't intersect the road centre lines and are not consistent in their distance from ...
4
votes
1answer
143 views

Showing snapping error in ArcGIS Online

I am doing some test in ArcGIS online to know how much helpful it is for my firm, But when I opened my road line .Zip shapefile in ArcGIS online it is showing some snapping issues as well as changed ...
3
votes
2answers
437 views

Are there any examples of using GIS in Civil Engineering construction field?

At the moment I am thinking "How to use GIS when construction HighWays,Buildings,pipe lines etc . Is there any way we can utilize GIS for Civil Engineering construction industry to increase the ...
5
votes
2answers
1k views

Leaflet Polyline with custom fill pattern

I'm drawing Lines with leaflet.js an have to create custom styled polylines. So i got various image files which should be like a repeated background image in HTML. So is it possible to give a drawn ...
6
votes
1answer
900 views

Open Source solutions for building a Traffic Management System

I am trying to set an Open Source alternative to proprietry ITS (Intelligent Transportation Systems) The goal is to build a Traffic Management System for a middle size city center. Main requirements ...