New answers tagged

0

There is a new tool available made by Hans van der Kwast. This plugin creates a vector watershed for every pour point. Here it looks like. This tool creates a separate shapefile for every pour point. A manual from the developer is available on Youtube Tested in QGIS 3.14 on Windows 10


4

I would not consider this a bug as the plugin runs excatly the way it is intended to. The very concept of Iso-areas implies that whole surfaces and not just networks (lines) are covered, thus even areas that do not line on the network. This in itself, conceptually, does not represent reality 100% as we all know from our everyday experience. Technically, if ...


0

Integrate tools can do this task. I tried it to make integration for OSM lines to get centerlines of streets


4

The problem you are experiencing is due to a missing functionality in QNEAT3 which cannot be provided using the current QGIS API. Currently, QNEAT3 is not capable of accounting for waterways/lakes (which seems to be the case in your example). The interpolation method for the isochrones therefore spans the iso-polygons in this areas too. Other than that, the ...


1

There is a repository I created to automate this, liberating all of the nuances buried in the answers comments: https://github.com/mattmarotta/QGIS-Subnet-Areas I will leave the current answer as is, largely due to the contributions of @Steven Kay (many thanks!)


0

A very simple way to generate Isochrones as well as Isoareas is the QNEAT3 Plugin. There have been some answers for this that should provide enough information for you as well, see e.g. this: https://gis.stackexchange.com/a/381891/88814, this: https://gis.stackexchange.com/a/378655/88814 and https://gis.stackexchange.com/a/379415/88814


1

One way to approach this is to add the spatial information directly to the graph object. For this we can use {tidygraph} and {sfnetworks} and adapt the original script as: # Load packages. library(rnaturalearth) library(igraph) library(sf) library(tmap) library(dplyr) library(sfnetworks) library(tidygraph) # Load countries from package. Use European ...


Top 50 recent answers are included