Robin's Blog

Archive for the ‘GIS’ Category

Review: Programming ArcGIS 10.1 with Python Cookbook

Summary: A useful guide to automating ArcGIS using Python, which is fully up-to-date with the latest version of ArcGIS. Definitely provides “quick answers to common problems”, but it may take more effort to get a deep understanding of the methods used. Good breadth of coverage – but notably lacks raster examples – and well explained […]

John Snow’s Cholera data in more formats

In honour of the bicentenary of John Snow’s birth – and because I was asked to by someone via email – I have now released my digitisation of John Snow’s Cholera data in a few other formats: KML and as Google Fusion Tables. To save you reading my previous blog posts on the subject, I’ll […]

Converting latitude/longitude co-ordinates to Landsat WRS-2 paths/rows

As part of some work I was doing for my PhD, I needed to automatically find what Landsat scene path and row would contain a pixel with a certain latitude/longitude co-ordinate (this was basically so I could automatically download the relevant Landsat image and do some processing on it). There is an online converter¬†(provided by […]

Major update to Free GIS Data site

The New Year is a time of new beginnings – and so it is rather appropriate to launch the complete redesign of my Free GIS Data list today.     As you can see from the screenshot above, it looks far nicer than before – but it is also far easier to navigate. The dropdown […]

Validating the validation?

So, I’ve been pondering an interesting scientific dilemma recently: how do you validate a validation technique? That is, if you’re using a certain procedure to validate some data (that is, check how correct/accurate it is), how can you validate the validation procedure itself? This has come up in my work recently in relation to validating […]

Updated Snow GIS data

A while back I released a GIS dataset containing Snow’s Cholera analysis data in modern GIS formats, and georeferenced to the British National Grid (see my previous post). Unfortunately, there was an error in some of the attributes of the Cholera Deaths shapefile which caused issues when using the data. This error has now been […]

I signed the Science Code Manifesto – and you should too!

I’ve just signed the Science Code Manifesto because I firmly believe in what it says. Ok well, that probably doesn’t tell you much – generally I tend to believe in things that I sign – but I’d like to tell you why I signed it, and why I think it’s really important. A lot of […]

In praise of ProjectTemplate for reproducible research

As you might know from some of my previous posts, I’m a big fan of making my scientific work¬†reproducible. My main reasons for being so keen on this are: 1. Reproducibility is key to science – if it can’t be reproduced then it can not be verified (that is, the experiment can’t be tried again […]

How to: Set raster values to NoData easily in ArcGIS 10

While processing some data at work today I had an issue where I had a raster dataset in ArcGIS, where all cells with invalid data had been set to 9999. Of course, this caused a lot of issues for the statistics on the dataset – basically they were all nonsense – so I needed to […]