Hi Hans,
I cannot tell you exactly how much memory you need but I can give you a general estimate.
Fragstats loads a landscape in a a 32-bit integer array which in your case takes 4 million bytes to store.
It then creates internal buffers and data structures that raise the memory need to about 8 to 12 times that, depending on your point density. If you use a resistance grid and/or a probability grid it adds another 1 or 2 integer buffers. There are other, transitory, data structures that are used in the process but they should not add significantly to the memory allocation.
In any case, any computer nowadays should be able to handle the total memory needs for an analysis like this.
I assume the system's memory is not allocated to some other processes. For instance, web browsers can take up gigabytes easily.
You can use the Windows Task Manager to look at Fragstats process' memory usage as it loads the dataset and when you start the analysis up to the point it runs out of memory.
If you need further help you can provide a copy of the model and dataset (not necessarily the one you work with, just something that produces the same error) and I'll take a look.
Best regards,
Eduard
