Computing, GIS and Archaeology in the UK

I’m sure everyone has been to some kind of social function, often an extended family gathering, where the first few lines of conversation with someone you’ve not met before invariably include the following: name, relationship to instigator of gathering, relationship to other attendees, and so on. I’ve often thought that some sort of heads-up-display would come in handy, providing you with this vital information, to avoid those awkward first few minutes of a meeting.

To avoid the unfortunate problem of heads-up-displays clashing with wedding outfits, Andrew Enright and his wife Heather Samples provided their wedding guests with a wonderfully elegant illustration of the relationships between everyone attending, along with “teaser-text” about each guest. When Barry and I married last August, we only invited nine other people, all of whom were close family, so we didn’t need this sort of thing, but it’s a great idea for any kind of large social gathering, to act as an ice-breaker. Mapping relationships between people is not a new concept, but this is a really nice use of it.

Wessex Archaeology are releasing their impressive gallery and flickr collection of photos under a creative commons license, according to Tom at Past Thinking. This is really good news, and shows that the idea of open access is catching on in British Archaeology. Read more »

A post from Daily Cup of Tech a while ago inspired me to add a “tumblog” to my site, for short-format posts on tips and tricks. I will be posting to this regularly to build up a library of code snippets, linux and windows tips and archaeological information.

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This is an idea that seems to come up every so often- what GIS programmes can you run from a USB stick. Well it appears that the list has just got longer. I’m probably the last person to realise it’s possible to do this, but I was really pleased to see that both GRASS and PostgreSQL can now be run from a USB stick, along with QGIS, XAMPP (inc Mapserver, OpenLayers, Tilecache), and FWTools.

Before I go any further, I should state that my aims for creating a portable GIS are not so much having a production GIS setup on a stick, because obviously performance and storage are an issue, but it might be useful for demonstration purposes, and I do feel as if the take up of these opensource tools might be more if they were easier to install and came in one handy package. So what I really want to achieve is a single portable package, probably a zip-file, that can be downloaded and unzipped onto a Window pc (they can learn about the joys of linux once we’ve won them over to the basic concept of opensource). No separate downloads, long installation and configuration processes, just a zip file. I do also like having portable packages on my main computer, as if it breaks it’s a lot easier to reconstruct the setup!

The light-bulb moment for me was when Leif told me that he had seen GRASS working on a USB stick using Msys at the recent CAA conference in Berlin. This intrigued me, so I looked into it and it works quite nicely- as long as you use the same drive letter to mount your USB stick to all the time. I still have to figure out how to figure out the drive letter and change the paths, probably in a batch file. Put simply, you download Mingw and Msys onto the stick, follow the instructions for downloading GRASS, edit the install_grass.bat file to change the drive letters, and off it goes.

PostgreSQL was something I had looked into a while ago, been told it wasn’t possible, and given up on. However, the recent 8.2 release appears to have dropped the requirement for a dedicated non-administrative user to run it. If you download the windows binaries, without the installer, you can set it up whilst logged on as the standard user. When you next run PostgreSQL from a different machine, you just have to use the same username as on your installation pc, regardless of whether that user exists on the pc that you are currently using. Once you have PostgreSQL installed, you can install Postgis into the same directory.

Currently there are a couple of gotchas. Most of these programmes require you to set environment variables, which might not be allowed on the particular pc that you are using, and require some command line experience. I still haven’t quite figured out how to get GRASS to work if I change the drive letter. Also, PostgreSQL does indeed run very slowly on a USB stick. And, I haven’t fully explored this to make sure there isn’t a hidden trap somewhere, or security holes that might be exploited. Having said that, if you want a package that can be unzipped onto a pc with a minimum of fuss then I think it’s almost there.

What’s next? Documentation, as always, and the permission of the various programmers that it’s OK to do this. Oh, and comments please, on what else we might include, or words of wisdom if you’ve already tried it.