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Messages - rob_hancock

1
Using SLAMM / Re: time step
September 27, 2009, 10:51:58 AM
Jonathan,

  Thanks for the reply.  It seems that the 5 year timestep is best for modeling in my research areas because of the small tidal range.

I know you have mentioned before that it is important to have time zero and the initial condition essentially the same.  What amount of difference have you found is acceptable.  Most of the classes in my model are within a 5% difference in coverage between the T-O and IC though it does change depending on the protection scenario.

Thanks for your ongoing support.
2
Using SLAMM / time step
September 21, 2009, 06:28:56 PM
I'm checking to see if Jonathan or anyone else has found a high degree of sensitivity to the time step chosen for modeling.  I have been using 25 years as the model default but I ran a 5 year time step and came away with significantly different results especially regarding transitional marsh and salt marsh categories.  I'm modeling a fairly small region (135K hectares) with a small tidal range (2 ft) and I'm curious as to the best time step.

Any thoughts?
3
Using SLAMM / Re: protection and nwi photo data options
September 07, 2009, 12:30:33 PM
Hello,

  I have also noticed that with 5.0.2.  Developed is always protected if anything other than don't protect is checked.  The way around that was to, as was already mentioned, run each scenario independently.  No big deal but just so you know.

  Also when i ran the "protect all" scenario, I did get a slight loss of undeveloped land, less than half a percent of the original land.  I assume that may be unavoidable, but I just wanted to check.

  Also, one last question here, it mentions Total Ha at the top of the spreadsheet output, so I assume the rest of the values are in hectares?

Thanks