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Messages - rloiselle

Using SLAMM / Input Vs. Output sub sites
September 26, 2011, 03:14:06 PM

I am confused about the difference between input and output sub sites.  Is the output sites data layer file used to spatially associate the sub site parameters? Or do polygons still need to be manually specified within the 'Set Map Attributes' button while inputting sub site parameter information?


Using SLAMM / Wetland Elevation Ranges
May 10, 2010, 02:10:39 PM
Does anybody understand the differences between the Tables on pg. 10 of the Technical Manual and Pg.14 of the Users Manual.  They seem to contradict each other when I plug in my values to the framework.

Ex.  Technical Manual (pg.10): Reg.Flooded Marsh, min.Elev = MTL and max.Elev = Ave(MHHW, SB), My data = 0 and 1.385
Users Guide (Elevation Analysis, Pg 14): Reg.Flood.Marsh, min.Elev = 0 Meters (MTL) and max Elev. = 1.2 HTU, my data = 0 and 1.3992

Is this because the Technical Manual is referring to a different rule set for the wetlands presented in table 2 (pg 10) when there is water present at the upper end of the wetland?

Thanks for clarification!

Yes, sorry, I am referring to "scale-up" as the Date/MTL adjustment which sets the data to time-zero.

Thank you for the help!

So, if a user is working with a low resolution NED, and using the data specified by the user within the site parameters... The scale-up takes place within SLAMM prior to the time series calculations.  In other words, I don't have to calculate the new elevations based on the the date equation on pg13 and the MTL adjustment equation on pg 9 of the Technical Manual. SLAMM does this for me as long as I specify the NAVD88 correction factor within the site parameters or I use a VDATUM layer in addition to other required layer files....

Thanks for the clarification!

For the Site Parameters, when would one want to (or not want to) specify the "MTL-NAVD88" correction used in the Elevation datum conversion?  What is the purpose of this parameter?

Using SLAMM / Scenario scale-up: Max, mean, min
March 24, 2010, 05:53:04 PM
I am a little unclear about how the SLR scenario "scale-up" works.  Can somebody clarify why the program produces output for an initial condition, then the next sequential year (I assume has to do with the scaling and setting DEM date to NWI date?), and then it starts the sequence of analysis for the specified time series??

For example, my NWI photo date is 2000, the DEM date is 1999.  The maps produced through the analysis are for the initial condition, condition at year 2000 (??), then 2025, 2050, 2075, and 2100.  There are very big differences between the initial land classes and year 2000 land classes, which seems questionable given the duration of the calculation (1 year).....

Another related question:  If I've already set my DEM elevations to NWI dates as indicated on page 9 and 14 of the Technical Manual, why does SLAMM need to upscale at all? 

I appreciate the clarification to my novice question!!   :D