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Geographic Information Systems

Questions tagged [isochrone]

a line on a diagram or map connecting points relating to the same time.

39 questions
Info Newest Frequent Votes Active Unanswered
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7 views

Isoscope, but for distance

Alright an isoscope shows me how far I can get within a specific amount of time. Is there a similar visualization that shows me everything within X distance by roads of location? If so what would be ...
3
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0answers
67 views

Automatisation of isochrone map creation in QGIS 3

I need to measure the area of isochrones for a big number of points, for different time thresholds and for different means of transport. I've been using the plugin isochrones in OSM tools with QGIS 3....
1
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2answers
51 views

Service Area or Catchment Area in R

I'm trying to find an R package to duplicate a specific bit of functionality of the ESRI network analyst: What ArcMap refers to as 'Service Areas'. Related terms include catchment areas isochrones '...
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0answers
60 views

Errors when calculating isochrones with OSM Tools

I'm trying to calculate isochrones using the OSM Tools plugin in QGIS 3.2.1. My input layer is a point layer in WGS84. All of its points are selected. When trying to calculate isochrones, I'm ...
4
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1answer
93 views

Displaying (or filtering) features in one layer based on features selected in another

I have points in a layer "Site-Centroids". I generate a lot of isochrones (polygons) around them, into "Isochrone_Site-Centroids". With all the isochrones displayed, the map is too busy. What I ...
0
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1answer
101 views

Walking distance with pgrouting for several locations

I'm intending to calculate the walking distance (not the linear distance, but the "real travelled distance") to several locations (e.g. social infrastructure). Thus I will have to create a routable ...
1
vote
1answer
98 views

Merging isolines into polygons in QGIS, building an isochrone map

There is a set of isolines produced with v.net.iso. It shows distances in meteres [400, 800, 1200, and everything further] from a certain point. My desired output is an Isochrone map. However, I do ...
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votes
2answers
296 views

Getting 15 minutes Travel time polygon from point (lat, long) using Google Road API?

Given a location specified as latitude/longitude, I want to know how to obtain a polygon feature that represents 15 minutes' travelling time from the original point location, using the Google Maps API....
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0answers
217 views

Options for generating travel time isochrones in QGIS 3.4: what do you use? [duplicate]

I'm currently using the updated OSM tools to generate isochrones in QGIS 3.4, which works well (example below). My question is just what methods other people use and whether there is something better ...
4
votes
1answer
175 views

Symbolizing Isochrones in QGIS

I have generated isochrones for London based on my parameters. However, the isochrones by definition are overlapping polygons. I would like to show the different polygons of the isochrones using ...
1
vote
2answers
87 views

GRASS v.net.iso tool produces empty output - QGIS 3.2.2

I want to split a network shapefile by cost isolines. I have two layers a point layer (with 297 records) a road network layer Every time I run the GRASS v.net.iso module in QGIS 3.2.2 on the road ...
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0answers
66 views

Adding a new link to an existing road shapefile in QGIS [closed]

I have an existing road file of Auckland. I wish to add a new road to the existing shapefile so I can calculate a revised distance isochrone. However, when I add the new link, it is ignored by the ...
8
votes
2answers
315 views

Equal Time Maps for Transit Network (Isochrones) on QGIS

I am on a committee looking to redesign transit service in Sacramento and need to be able to make equal-time maps or "isochrones," like the attached. A prominent difference between transit isochrones ...
2
votes
1answer
272 views

Creating distance isochrones along road network in QGIS? [closed]

I am trying to create isochrones which illustrate all routes along the road network within defined distances of a location i.e. 500m, 1km and 1.5km. I would like to avoid using radii because it isn't ...
2
votes
1answer
62 views

Is there a UK elevation raster layer available for use in QGIS for the WalkingTime plugin?

I am currently trying to convert the OS Terrain® 50 shapefile into a raster format using the Rasterize function, but the output is just a black square which doesn't seem to have any data attached to ...
1
vote
2answers
188 views

Cutting polygons in same isochrone map layer?

I've created some travel time isochrones using the 'OSM Tools' plugin in QGIS. I now need to remove overlapping sections of the isochrone layer so that I'm left with discrete polygons for each ...
0
votes
1answer
47 views

Polygons have holes after pgr_pointsAsPolygon

I calculate a 500m Isochrones with pgr_drivingDistance and after that use pgr_pointsAsPolygon to create the Isochrones out of the resulting nodes. SELECT * FROM pgr_pointsAsPolygon('SELECT id,x,y ...
0
votes
1answer
52 views

Carto isochrones funtion returns syntax error

Using this snippet of code: INSERT INTO my_new_table (the_geom) SELECT (cdb_isodistance(the_geom, 'walk', string_to_array(distance, ',')::integer[])).the_geom FROM my_original_pts_table I ...
1
vote
0answers
176 views

GRASS GIS v.net.iso prompt not calculating correct travel time distances

When I run the v.net.iso command then export it into QGIS, the distance isochrones are not calculating my prompt distances (e.g. 1km, 2km, 5km). 1km distances (shown in green) are next to the 5km ...
0
votes
1answer
272 views

pgr_drivingDistance for isochrones

I´ve tried to calculate Isochrones in 500m walking distance along paths around planned subway stations with pg routing. For the setup I used an OSM-road.shp clipped to the borders of Vienna and a ...
1
vote
1answer
24 views

Can I automatically cut the polygons created from Prepare Time Lapse Polygons tool to prevent polygon crossing a Network Restriction?

I am trying to develop isochrones (polygons showing how far you can get from a bus stop in a certain amount of time) for an entire transit network. In order to do this, I have created a custom network ...
1
vote
1answer
348 views

QGIS Overlapping OSM Isochrones

These are 3 Isochrones created with the OSM-Tool. They are marking catchment areas for footwalking. Since im pretty new to QGIS I have no idea how to unite the isochrones into 1 Isochrone. Any idea?
1
vote
1answer
142 views

QGIS: GRASS “V.net.iso” + Slope

I wonder if someone knows a way to calculate time-cost isochrones in a bike road network layer, taking the slope into consideration. The GRASS tool "v.net.iso" allows to create a line-vector layer ...
1
vote
1answer
268 views

Creating travel time isochrones using ArcGIS Desktop?

I am trying to build isochrones of 5, 10, and 15 minutes walking time from service area points using ArcMAP 10.4.1. I used Digimap's Integrated Transport Network merged with Digimap's Urban Path as ...
1
vote
1answer
258 views

Combining several catchment areas

I would like to combine several catchment areas (points feature) into one catchment area. There are examples of my catchment areas. Each area has one source (POI).I will use the combined area to ...
2
votes
2answers
130 views

Isochrones: v.iso.net

I have a line layer with multiple traffic lines: bus, train and tram. Those lines overlaps frecuently. Every line has its own speed limit and therefore time/cost. My goal is to do a time/cost map (...
4
votes
0answers
100 views

pgr_drivingdistance seems to be excluding nodes that should fall within the cost parameters set

I am getting a result that I don't understand and I am not sure if its my lack of understanding of OSM. I am using the pgrouting functions pgr_drivingdistance to get the list nodes reachable within ...
4
votes
1answer
298 views

How to split overlapping polygon isochrones in QGIS?

I have two overlapping isochrones -- 10 minutes by bike from 2 neighbouring railway station -- and I want to split them in a balanced way, so as to determine the bikeshed of each railway station. The ...
2
votes
0answers
220 views

Creating Isochrone-like polygons from a polyline network in QGIS

I wanted to create drivetime isochrones with the GRASS v.net.iso tool and I created a network with 4 categories (each category stands for 1000m in distance). How can I create polygons from this ...
1
vote
1answer
112 views

Smoothing Service Area Polygons

I've a created a web service using the ArcGIS API for Javascript that displays isochrones (service area polygons) generated from a network dataset built in ESRI's network analyst. My issue is that ...
1
vote
0answers
149 views

Driving_distance() for pgRouting

I am trying to create an isochrone that would show all the points that can be reached within a certain distance time, starting from a central point. I have installed pgRoutine (v. 2.2) as per ...
3
votes
2answers
1k views

Is OSM route plugin working?

I have computed some isochrones using OSM route plugin but when I am trying to use the plugin again it gives me an error: An error has occured while executing Python code. Is it working for you?
2
votes
1answer
2k views

Creating isochrones in ArcGIS for Desktop?

Is it possible to create isochrones (lines of equal travel time to or from a certain point) in ArcGIS? I have a street network, with the streets having a speed limit attribute, and I need to create a ...
0
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2answers
1k views

Isochrones for public transport [closed]

Is there a way to compute isochrones for public transport while using the plug-ins available in QGIS? Or is there another way for making them? Note: I am not a software engineer which means that some ...
1
vote
0answers
85 views

Why the isochrone is changing its shape?

I am doing some isochrones using the OSM route plugin in QGIS, but if I am keeping my working space open for a few of hours, the shape of the isochrones is changing. I guess that from the ...
4
votes
1answer
5k views

Travel time calculator QGIS

I will try explain this as best I can. I have a point on a map and I want to create buffers surrounding the site; for example, 10Km, 20Km 50Km. This is easy. But I also need to show buffers for ...
1
vote
1answer
218 views

Return nodes along portions of edges with pgrouting

I have been experimenting with generating isochrones with pgrouting using osm data. So far, I have been able to generate isochrone polygons by getting the concave hull of the nodes returned from the ...
4
votes
2answers
3k views

Create isochrones from streets with distance values?

I have made isochrone lines using GRASS and QGIS, as shown. The lines show various distances to fire stations on a street network. Now I would like to turn these lines into polygons that look like ...
0
votes
2answers
1k views

How can I create isochrones in postgis/osm2po/pgrouting and then save the isochrones as polygons?

I am creating some isochrones in pgrouting based upon a table from osm2po. Now I have a query that will get all of the edges that are c driving distance away from a point. How can I save this query or ...