Thanks to everyone who attended my talk last week at FOSS4G.
Here’s the presentation (pdf format). I’ll try to upload it to the FOSS4G site as well.
I really enjoyed myself, and there were some interesting questions. Here’s a quick summary of the questions and the answers I tried to give:
Q: How long does it take to run?
A: About 20 minutes on a fast-ish (4gb Ram) machine. Its fairly slow at present, due to the two loops and also I think the focal filter operation. I reckon it can be sped up quite alot if the inner loop can be removed (thanks for the tip Thomas), I’ll try to do this as soon as I can!
Q: Why did you present a single simulation for 2050 instead of a range of simulations showing the probability of land use change according to where it was located in each simulation?
A: Good question. I didn’t have much time. Certainly it would be much better (and more useful) to generate, say, 100 simulations, and then work out the probability of change. I wonder if it can be built into the script somehow?
Q: Have you run any tests against comparable commercial software?
A: Not yet, though I do intend to. The Ksim and fractal dimension results are within the realms of what one would get on a commercial system, and the cellular growth behaviour looks realistic. But I haven’t yet run a back-to-back comparison. This is probably the most important priority. Thanks!
I can’t remember if there were any other questions. But feel free to write me an email and remind me!