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

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14
votes
4answers
9k views

Creating Centrelines from Road Polygons/Casings?

I want to create center lines from road polygons. Are there any automated tools in ArcGIS for Desktop to do this? I am including a Screenshot of my vector file below.
14
votes
2answers
1k views

How can I merge/collapse nearby and parallel road lines (eg. a dual-carriageway) into one single line?

I have a shapefile from OSM which contains all the roads within a city. Larger roads (like dual-carriageways) seem to have 2 parallel lines. I'd like to collapse / combine those into 1 line so I can ...
12
votes
3answers
874 views

Recommendations for road maintenance management (on a small scale)

I am in a road association and we maintain our own 3 mile dirt road. In doing research on best practices for maintenance I discovered that other organizations use some mapping/GIS programs to help. ...
7
votes
4answers
2k views

How to find dead-ends in road network using ArcGIS for Desktop or GRASS?

I'm trying to remove all the dead-end roads in a road dataset (lines) that are less than 100m long. How do I identify roads that are dead-ends (no exit)? The 100m part is easy. I know how to use ...
7
votes
2answers
740 views

Extracting roads out of Landsat raster images

For a study into the expansion of road networks in the rainforest I am trying to extract roads out of Landsat images. We already have sharp and cloud-free composites on which the roads are clearly ...
7
votes
4answers
269 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 ...
6
votes
1answer
971 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 ...
6
votes
1answer
3k views

What does the code RTTYP represent in the USA Tiger road files?

I'm trying to figure out what a particular code represents in the US Census Tiger Line files for roads. I downloaded roads for the US from here. I've searched the documentation (link to large pdf) and ...
6
votes
2answers
2k 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 ...
6
votes
2answers
123 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 ...
5
votes
2answers
551 views

How can I make segmented roads appear as one line?

I am footling around with Quantum GIS and the British OS Strategi dataset. If I render the roads with a simple line style they look fine: However, if I apply something slightly fancier, it looks ...
5
votes
2answers
2k 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 ...
5
votes
2answers
1k views

US Tiger or Open Street Map Route Data: One Way Street & Intersection Data

We're building a U.S. street routing application (finding paths for cars between two or more locations using public roads) and would like to use open source data US Tiger Data or Open Street Map or ...
5
votes
1answer
715 views

Where can I find High Quality Road Network Information

I am carrying out a research on how complex city road networks get and I need to get accurate map information. I started with openstreetmaps however I ran into a couple of issues: some of the dumps ...
4
votes
1answer
147 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
4answers
128 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 ...
3
votes
2answers
78 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 ...
3
votes
1answer
81 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 ...
3
votes
2answers
474 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 ...
3
votes
2answers
37 views

road density km/km2 calculation

I am trying to calculate the road density in my study landscape. I am using the spatial analyst, and the line density function. By default, the tool is setting a cell size of 3.6km*3.6km, and the ...
3
votes
3answers
945 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 ...
3
votes
2answers
307 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 ...
3
votes
0answers
799 views

leaflet - Drawing line following the road

Short version: What I wish to be able to do is drawing a polyline along part of a road. In that way marking certain houses, along this road. Long Version: I have several houses that I wish to mark ...
2
votes
5answers
1k views

Counting road intersections and blocks

I have a shp file that consists of the road system of Mexico City. I would like to count the number of road intersections (crossings) and blocks (which I would define as a segment starting from one ...
2
votes
2answers
156 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 ...
2
votes
1answer
51 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 ...
2
votes
2answers
109 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 ...
2
votes
1answer
3k 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
81 views

Northern Ireland Roadway Network shapefile

Does anyone know of an open-source alternative to the £7k+ offering in the Ordinance Survey map shop?
2
votes
1answer
381 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 ...
2
votes
3answers
292 views

Get the LatLon of middle points of a road segment?

Suppose I have the LatLon of the two end points as well as a small number of middle points of a road segment. What is the best way to calculate the LatLon of a middle point P of the road segment ...
2
votes
1answer
234 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
953 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 ...
2
votes
2answers
272 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 ...
2
votes
1answer
237 views

How to extract a single road from OSM GIS Database?

Is there a way to extract a single row out of the OSM-GIS-Database (by a Query). It would be so much easier, if I could find an EER Model of the Database. I was searching a long term and found very ...
2
votes
1answer
597 views

How to design a road with a certain slope

Is there a way that you want to connect two different points of altitude with a constant slope of 7% or another, to draw a line in the 3D model?
2
votes
1answer
24 views

Map Matching GPS to Road Network

I'm working on a project for which I have GPS points and I would like to extract the sequence of roads related to those points. I know that this is called "map-matching" and that there is a load of ...
2
votes
0answers
51 views

How to add column to attribute table using field calculator with $length function?

I used the following code to add a separate column to the attribute table with the length of features. from PyQt4.QtCore import QVariant from qgis.core import QgsField, QgsExpression, QgsFeature ...
2
votes
0answers
24 views

inputing road network as nodes and arcs in java

I want to input a road network as nodes and arcs. Some of the nodes are intersections, others serve to describe the shape of the road. Road network should be modeled as an embedded graph consisting of ...
2
votes
0answers
143 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, ...
2
votes
2answers
67 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 ...
2
votes
1answer
59 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
92 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
530 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
93 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 ...
1
vote
2answers
45 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 ...
1
vote
2answers
133 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 ...
1
vote
1answer
267 views

ROAD COORDINATES Data (CARDIFF)

Does anyone know how to get road coordinates data from openstreetmaps? I know its possible I just don't know how. Thank you!!
1
vote
1answer
622 views

Create buffer-lines in QGIS alongside Vector lines

I am currently doing a map of a farm, to see which roads needs to be repaired. Those roads are either one sided fenced, on both sides fenced or not fenced at all. I want to make buffer lines around ...
1
vote
1answer
194 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 ...