Questions tagged [isochrone]
An isochrone is a line on a diagram or map connecting points relating to the same time.
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QGIS SAGA Isochrone crashes
I am trying to make isochrones with SAGA GIS.
I am now having a problem that:
The Isochrone variable speed crashes or give odd outputs.
I have a DEM with 3.6km2, but the output is about 3 pixels,
even ...
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QGIS Network analysis: Consideration of heights
I want to calculate isochrones in QGIS from a location X (for example, a catchment area of 900 metres). We use our own dataset of footpaths for this. So far, this has worked very well with the network ...
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Loading Germany map to ors app on docker - decoding .tiff error
I am fairly new to QGIS and docker so I would like to ask more experienced people. I am calculating driving time isochrones for over 60min reach in QGIS.
To do so I installed ORS app in container in ...
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Using data points lying within certain isochrone to model walking routes in QGIS
I am trying to model the routes students take to university on foot using QGIS. I have the student data in point form, but this is the student data for the whole city. I also have an isochrone which ...
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QNEAT3 'Iso-Area as Polygons processing error
I am doing a network analysis on QGIS.
Versione di QGIS: 3.28.12-Firenze
Revisione codice QGIS: dcc633b2de
Versione di Qt: 5.15.3
Versione Python: 3.9.5
Versione di GDAL: 3.7.3
Versione di GEOS: 3.12....
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QNeat3 Polygons do not finish calculating interpolation
I have been using QGIS for a couple of years and used QNEAT3 for the first time around one year ago. I never had any problem with it but, after some months not using it, I tried to use it again to ...
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Creating an isochrone from GTFS data
I want to create an isochrone map, with a single stating point at first, from standard GTFS data.
I've started by filtering only the relevant areas both in Stops and Shapes files, but now I'm not sure ...
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Creating isochrones with given coordinates and times in QGIS
I have an origin coordinate and a list of destinations. Each list element has the related coordinate and the minutes spent to reach it. I want to build an Isochrone map starting from this data, ...
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Creating a buffer that tapers in thickness in GeoPandas
I'm currently working on a project involving creating an isochrone map of historical water travel. At the moment, I have a geodataframe containing a starting point on the river, a multipoint of the ...
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Merge multiple Isochrones
I have 2 Isochrone maps generated by OpenRouteService (using the R package). Each segment represents a walk of 60 seconds, 300 seconds in total.
Since both starting points are quite near, the ...
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How to divide watersheds by iscochrones/travel times in QGIS?
I need to divide my watershed by isochrones of equal travel time to the output, dividing my watershed to inter-isochronal areas in order to use the time-area method to calculate runoff time series, in ...
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QNEAT3 Execution failed [closed]
I've been attempting to run a number of different processes within the QNEAT3 toolbox, however I keep on getting an error similar to the one seen in the image below:
Traceback (most recent call last):...
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QNEAT3 Error: AttributeError: 'NoneType' object has no attribute 'GetRasterBand'
I'm using the GUI for QGIS (not writing my own Python script). I'm new to QGIS.
I'm using the QNEAT3 plugin to create isochrones using the Iso-Area as Polygons (from Point) algorithm. I'm getting the ...
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Calculating population in catchment area in QGIS
In QGIS 3.22.0 (Biatowieza) by means of the "OpenRouteService" Plugin I was able to get isochrones for my point layer.
The "ORS Tools" Plugin calculates the population within the ...
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Errors in ORS (OpenRouteService) when calculating distance isochrones, what can I do to prevent this?
I've made distance 'isochrones' around charging points for cars with ORS. But the result is puzzeling, the resulted 'isochrones' are in some places larger than 250m.
This pictures shows the error on ...
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Default speed parameter for Iso-Area polygons in QNEAT3 plugin
In the answer for a similar question (QNEAT3 plugin and Iso-Area polygons), it is stated that in QNEAT3 “You can either define a default speed that is used for all graph edges (eg. streets) the time ...
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Calculate isochrones in R within a personal network
I just need to calculate the isochrones in R from an starting point within a personal network. This network is a sf linestring with an id attribute and a speed value. There are not any other ...
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Having trouble with Mapbox Isochrone FeatureCollection return type
I'm making a call to the Mapbox Isochrone API to obtain a FeatureCollection with this code:
string getIso = lng.ToString() + ","
+ lat.ToString()
+ "?...
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Qgis QNEAT3 Plugin execute error
I have an problem running Iso-Area as Polygons.
*Traceback (most recent call last):
File "C:\Users/Ivan.Ivanov/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\QNEAT3\algs\...
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QGIS QNEAT3 Iso-Area Polygon not creating polygon or data
I am trying to calculate distances from parks in a small part of town. I have road centerlines (MultiLineString) and park entrances (Point) and want to use QNEAT3 to create iso-areas as polygons ...
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OSRM Isochrone - straight/square edges
I am calculating 1 hour cycling distance using osrmIsochrone in R and Docker. I have noticed that the polygons have square/straight edges. (see below example)
Increasing the res even to high values (...
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Dissolving isochrones from point layer in QGIS
I have created a set of isochrones (3, 5, 10 minute walk times) from a point layer. I now want to dissolve the layer to make it more readable. However when I try to dissolve based on the field that ...
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Aggregating isochrones with accessibility values in QGIS
I have created a series of isochrones for public transport, for the bus, tram and train, with a 5 and 10 minute walking range. Now I would like to aggregate these values to show which areas are most ...
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Add virtual field for vehicle speed to OSM roads (tag='Highway')
I want to add additional speed values to my OSM data. There is a maxspeed value for some of the roads, but a lot of values are 'null'. Therefore, I would like to add additional values based on the OSM ...
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Where should I add the API key in ORS Tools?
I want to make an isochrone for my halte and station points. But I have to configure ORS Tools with my API key. The problem is, I can't find any configuration button in my ORS Tools plugin.
How should ...
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Difference in the shape of polygons
I created isochrones using Iso_area as polygons algorithm of QGIS. I created the green polygon feeding the algorithm with the speed field of the road network. Then I created the blue polygon using the ...
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The proportion of population covered by created isochrones in QGIS
I created isochrones using Iso-Area as polygons algorithm is QGIS. I would like to calculate the proportion of the population covered by the created isochrones. Is there any tool in QGIS to do this?
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Calculating the area covered by isochrones in QGIS
I created isochrones using Iso-Area algorithm as polygons in QGIS. Is there any tool in QGIS that helps with calculating areas covered by created polygons?
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How to dissolve overlapping distance isochrones
For my master's thesis I need to create distance isochrones (10/20/30/../100km) around certain coordinates. In my case they overlap and I want the overlapping parts to dissolve, but at the same time ...
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Making nonoverlapping service area polygons using QNEAT3; service area polygon errors
I am doing a project in which I am determining which areas of New York City can be accessed within a five- or ten-minute walk of a subway entrance. I have done this in the past in ArcGIS, and am ...
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Why do I get gaps in the isochrones polygons with ORS tool in QGIS?
I am trying to represent isochrones from a points layer using ORS Tools in QGIS 3.8.3-Zanzibar.
Does anyone know why there are some gaps in the resulting polygons, even though the road, according to ...
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Mapping origins and destinations to the created isochrones in QGIS
I created isochrones in QGIS using Iso-area as polygon algorithm with an interval of 30 minutes. I have some coordinates related to some origins and destinations. I need to map these origins and ...
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HERE Isoline API V8 doesn't account for traffic
I am playing with HERE Isoline API v8.4.0 and it works pretty well. The documentation mentions that setting departureTime parameter will include traffic in isochrone calculation. However, the results ...
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How to build isochrones with GeoTools?
It is possible to compute shortest paths with GeoTools with its graph package.
Is there a package (or extension) for computing isochrone lines or areas, that is the area which can be reached from a ...
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Created isochrones are not displayed (QGIS QNEAT3 Iso-Area as polygons algorithm)
I am trying to create isochrones using Iso-Area as polygons algorithm in QNEAT3 plugin. I choose the fastest past as the cost strategy. when I use the default speed to create isochrones the output ...
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Accessibility analysis using isochrones and network analysis tools QGIS 3.16
So I made an isochrone using ORS Tools plugin, as well as using the Network analysis toolbox to analyze the service area of the bus stop. Ultimately I want to provide a statement of X% Area covered ...
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Calculating isochrone for linestring
I have seen APIs and algorithms for calculating isochrones for a single point, e.g. https://openrouteservice.org/dev/#/api-docs/isochrones.
Is it possible to calculate the isochrone for a line segment,...
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Creating multiple points on Mapbox Isochrone map
Is it possible to create multiple points on an isochrone map in Mapbox?
This is the documentation for one of their maps with one point: https://docs.mapbox.com/help/tutorials/get-started-isochrone-api/...
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Iso4app parameters in QGIS
In Iso4app QGIS plugin, in the isochrone parameter window, how speed type and speed limit work?
do they work based on the maximum allowed speed of the roads? or if we determine a speed level more than ...
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QNEAT3 plugin and Iso-Area polygons
I need to generate isochrones considering emergency vehicle’s speed. I have checked several packages in R and different plugins in QGIS. I found QNEAT3 (Iso-Area as polygons) as the only tool that the ...
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Isochrones for emergency vehicles using QGIS
I need to generate isochrones for emergency vehicles.
Is there any possibility of QGIS to do this?
I checked TravelTime and QNEAT plugins but unfortunately, I could not find any way.
With TravelTime ...
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Issue with osrmIsochrone function in R
I have been using osrm package for a while and didn't ever come across this kind of issue before. It looks so weird and I have been trying to update package and reinstall R as well. But nothing is ...
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Seeking plugin for QGIS to create iso-distance polygons longer than 120km
I'm new on QGIS and I have been using the ORS plugin to create isochrones and iso-distance polygons. However, through Openroute Service I cannot create iso-distances longer than 120km.
Is there any ...
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Isochrone along direction map of watershed
I am interested in producing a isochrone map given a raster speed map and a direction map (like the output of r.watershed), but I do not see how to produce it.
I have studied r.walk and r.cost wich ...
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Creating isochrones in a travel-time map
I'm working on building a travel-time map using time-expanded model and Java. I calculated the reachable points with Dijkstra's algorithm from a start point and within a specific travel time and I ...
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Populate field with drive time values during isochrone creation in Carto
I'm creating isolines (isochrones) in Carto to show 15, 30, 45, and 60 minute drive times from a set of points in a shapefile. Here is the SQL I've written to create those isochrones in an empty table....
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Iso-Area jumping over parts without streets (QGIS QNEAT3 Plugin)
I am using the QGIS Plugin 'QNEAT3' (version 1.0.4) to calculate Iso-Areas. They are only relevant for me in one country, so I only have this country's street network. But the Iso-Areas are jumping ...
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Finding nearest POIs by travel time(not distance) given current location and travel method
A user can choose between walking, bicycling, public transit, or driving for X minutes. Their current location is a latitude and longitude pair given by the HTML5 Geolocation API(wgs84). The (roughly ...
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Weird behaviour when intersecting polygons in python Shapely
I'm using shapely to get the intersection between an isochrone polygon and a restriction area my car can't leave. I have a list of restriction areas, some of which overlaps by little, making it harder ...
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90 minute isochrones in QGIS
I recently discovered QGIS. The software is very impressive, even if it is not always easy to know how to unlock the features. This article provides good pointers, although I can't make it work.
I ...
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