qgis - Mixedbredie's Ghosts

Voronoi isochrones

How can we visualise our driving distance dataset another way? Can we create something like this which is using Voronoi polygons: Palvealueanalyysi avoimella lähdekoodia #Hämeenlinna #PostGIS #pgRouting #sote #OSGeofi pic.twitter.com/ssyCD0vOxN — Pekka Sarkola (@posiki) May 23, 2017 Well, yes we can. And PostGIS gives us the tools

pgrouting

Processing thousands of journeys: a pgRouting function

I have a dataset of pupils and the schools they attend. For each pupil I have a source XY coordinate and a target XY coordinate. I have a table of schools where the school name matches the name in the pupil table. I also have a full featured road network

pgrouting

Driving Distance Animations with pgRouting - a how to

Checklist QGIS with the Time Manager plugin installed. a PostgreSQL database with PostGIS and pgRouting extensions installed. access to said database through psql or pgAdmin3/4 A quick and dirty workflow to create some animations using a road network and some driving distance calculations. I won't go through the process

qgis

TauDEM Toolbox in QGIS

You might want to use the TauDEM Toolbox in QGIS. The QGIS docs give you all the detail on the available algorithms but you need to install and configure the toolbox yourself. You might get error messages about mpiexec not being being found on your system. QGIS installs most of

qgis

QGIS Map Tools at BCS SOC

I recently presented at the BCS SOC annual conference in Cheltenham on the cartographic map tools available in QGIS Essen 2.14 and Nødebo 2.16. BCS\_SOC\_2016\_rossmcdonald\_qgis_maptools Props to Nyall Dawson and Nathan Woodrow for the fantastic new features they've added and the rest of

qgis

Hexperiments in QGIS

After seeing the post by John Nelson on hex binning using ArcGIS I thought I better try it in QGIS as the effect is pretty neat. Open the Processing toolbox and find the QGIS geoalgorithm > Vector Creation Tools > Create Grid Select your grid type: hexagon I created grid

pgrouting

All-in-one function to create isochrones

Well, almost all-in-one. The function currently requires some prep work on the input points before being able to generate the isochrones (alphashapes). The function takes as its arguments the point input table you want the isochrones for and the time in seconds. CREATE OR REPLACE FUNCTION public.make_isochronesX(v_

pgrouting

pgRouting alphashapes - batched

A while back I looked at generating alphashapes using pgRouting and displaying in QGIS. It was a pretty convoluted hack though and my SQL skills need some honing. After seeing a post by smathermather that generated isochrones using PostgreSQL functions and the pgRouting algorithms I thought there must be a

dataviz

Council Tax Data Viz

A simple data visualisation of all properties within development boundaries coloured by council tax band. Multiply blended colours to give an indication of property density which is particularly noticeable in the larger burghs - Arbroath, Brechin, Carnoustie, Kirriemuir, Forfar, Monifieth and Montrose. Created in QGIS 2.14 Essen using blend

qgis

Uninstalling QGIS with SCCM

To make IT sysadmins' lives easier at work (actually, to make my life easier) we use Microsoft's System Centre Configuration Manager (SCCM) to roll out applications to users. We can push out QGIS to machines and the software takes care of 32- or 64-bit architectures and installs the version we

gis

QGIS 2.12 Lyon

QGIS 2.12 Lyon has just been released with a ton of new features. I particularly like the new rule based labeling options giving fine grained control. The change log has a very comprehensive list of all the other new features. Download the latest version for your Windows, Mac or

qgis

4th QGIS UK user group in Edinburgh

The next QGIS user group meeting planning and organising is gathering momentum. A free-to-attend full day of open source goodness where you can ask questions, provide answers and tell people about your FOSS4G experiences. Date: 16th November 2015 Time: 9:30 - 16:30 then geobeers Thanks to EDINA for

pgrouting

pgRouting alphashapes

The pgRouting Layer plugin in QGIS gives you access to all the complex routing algorithms in pgRouting through a nice user interface. Once you have solved your route you can export your results saving them for Ron*. But you can't export the results of the driving distance and alpha shapes

qgis

Viewsheds in QGIS

QGIS offers a fantastic selection of plugins and in this short post I'll show you the results of just two of them: Viewshed Analysis plugin and QthreeJS. The advanced viewshed analysis plugin allows you to very quickly generate a binary viewshed (can I see it or not?) using a DEM

qgis

TIN with FME

Using OS Terrain50 with VectorMap District's water and woodland polygons I used Safe's FME Desktop to generate a landscape inspired by Owen Powell's work. FME lets you export the triangular faces of the TIN as polygons. Using the FME Data Inspector to view the surface in 3D. Rendered in QthreeJS

pgrouting

The QGIS Road Graph plugin

QGIS offers a plugin that will solve a shortest path problem across any vector polyline layer in any format - the Road Graph plugin. The advantage of using this plugin over pgRouting is that you don't need to do anything special to your polyline layer to route across it. As

pgrouting

Improving pgRouting Performance

The Network I've loaded up the new Open Roads network dataset from Ordnance Survey into PostGIS and got it working with pgRouting. I can route successfully from A to B across the network. The problem is that it is so slow. There are 3.18 million road links and 2.

ordnance survey

pgRouting and OS Open Roads

Get the data you need from OS: http://www.ordnancesurvey.co.uk/business-and-government/products/os-open-roads.html Load the data into PostGIS using QGIS or pgAdmin or ogr2ogr - your choice. This takes some time to process as there are a large number links making up the network: 3.6 million

ordnance survey

OS Open Map Brinjal style

It's dark. It's brooding. Is it bruised? No, it's a simple dark rendering of the Ordnance Survey's Open Map Local product. The style sheets were created in QGIS and are available from Github. I only used the roads, buildings, surface and tidal water layers, and a very muted styling of

ordnance survey

OS Open Map Camper style

Here's another set of QML files for QGIS for styling up the new open data Open Map Local from Ordnance Survey. It's a little bit retro and uses nice clean colours and some different fonts. It doesn't use all the layers from Open Map (that's the beauty of working with

pgrouting

Using pgRouting with OS Meridian2

A quick guide to building a pgRouting network from Ordnance Survey's Meridian2 dataset. It assumes you have a working PostgreSQL/PostGIS database. The most current information will be on Github: https://github.com/mixedbredie/meridian2-for-pgrouting Get the data Download the Meridian2 shapefiles for the UK from https://www.ordnancesurvey.co.

pgrouting

Using pgRouting with OS Strategi

A quick guide to building a pgRouting network with Ordnance Survey's Strategi dataset. It assumes you have a working PostgreSQL/PostGIS database. The latest information will be on Github: https://github.com/mixedbredie/strategi-for-pgrouting Get the data I downloaded the shapefiles for UK coverage from the Ordnance Survey: https://www.

pgrouting

Building ITN for pgRouting

This document and repository explains how to load Ordnance Survey ITN GML into a PostGIS database with Loader and then build a network suitable for use with pgRouting. The network will have one way streets, no entry and no turn restrictions, mandatory turns and grade separations for over- and underpasses.