Category Archive: GIS

Ordnance Survey Terrain 50: merging in R

I’ve written previously about Ordnance Survey’s Terrain 50 data and how you can merge it together. You can download the dataset from the OS’s opendata repo. I’d like to update that post with… Continue reading

GB postcode polygons – open data

Newly published postcode open data!

Getting started with spatial data in R – EdinbR talk

Slides from January 2018 EdinbR session on spatial data in R.

Network analysis video – 7th Scottish QGIS user group

Network analysis presentation from the 7th Scottish QGIS user group. Featuring Ordnance Survey open data, QGIS, GRASS and R.

Spatial networks – case study St James centre, Edinburgh (2/3)

This is part two in a series I’m writing on network analysis. The first part is here. In this section I’m going to cover allocating resources, again using the St James’ development in Edinburgh as an example. Most excitingly (for me) the end of this post covers the impact of changes in resource allocation.

Spatial networks – case study St James centre, Edinburgh (1/3)

Last year I spent a bit of time learning about routing and network analysis. I created a map of distance from each GB postcode to the nearest railway station. At the time my… Continue reading

R with GRASS GIS – easiest Munros

I’ve been having a more sustained play with R and GRASS together. I’ve previously used them, in tandem, for processing satellite images, but haven’t been much further. In this post I’ll look at… Continue reading

R – iteratively changing column classes

When you write an ESRI Shapefile from R, writeOGR assumes your numeric fields are real numbers and so you get a lot of redundant zeros appended. This is misleading and distracting when you… Continue reading

R – Change columns names in a spatial dataframe

Ordnance Survey have a great OpenRoads dataset, but unfortunately it contains a column called ‘primary’, which is a keyword in SQL. This makes it challenging/impossible to import the OpenRoads dataset into a SQL… Continue reading

Converting (British) National Grid references

I was supplied spatial point data this summer where the locations were detailed in Ordnance Survey’s National Grid (NGR) format. If you’re not familiar with it, rather than using eastings and northings (in… Continue reading