For a long time I have been searching for a simple, easy-to-use, comprehensive list of freely available GIS datasets that I can use in my academic work – or for any other non-commercial purposes (eg. teaching, ‘just for fun’ applications, etc). All of the lists that I have found have been out-of-date, riddled with adverts, […]
Just a quick post this time, as I’m currently enjoying a nice holiday (well, holiday combined with work) in France. I had to post this because I’ve just realised that one of my biggest gripes with ArcGIS has been fixed in version 10! Hooray! I suspect a lot of other people have been frustrated by […]
Summary: Great book – both for GIS concepts and for teaching Python libraries. Lives up to the boast on the front cover – you really will learn to create complete mapping applications, learning a lot of useful tools and techniques on the way. Reference: Westra, E., 2010, Python Geospatial Development, Packt Publishing, Birmingham, UK, 508 […]
I spent part of today struggling with an undergraduate student to get our university-provided ArcGIS dongle licenses to work. In the spirit of sharing our hard work with the rest of the world, the solution below may be of use to people. The error that we got which were fixed by this solution are listed […]
Quite through chance I just happened to stumble upon the USGS New EarthExplorer, and I’m really quite impressed. Remote sensing is a field that is almost entirely based around new technology: satellite sensors, computer processing techniques and so on, but for ages actually acquiring the data has been an exercise in frustration. Much as the […]
As part of my DunesGIS project I had a need to calculate ‘closeness statistics’ for objects in ArcGIS. By ‘closeness statistics’ I mean statistics giving information about how close the objects are to each other. I needed to do this to calculate how dune patterns change over time. The code below takes a shapefile as […]
No, this isn’t about thinking deeply while the wind is blowing, or philosophising about how the wind is there but we can’t see it – it’s about sand dunes. Now, you might think that sand dunes are quite boring things, just hills made out of sand that sit there and do nothing. That couldn’t be […]
I’ve recently starting scripting ArcGIS using Python as part of one of my academic projects (about which I’ll post more later) and needed to be able to snap points to polylines – that is, move points so that they lie on the nearest polyline. An example would help to explain this: In the image above, […]