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Using SLAMM / Re: Issue registering elevatio...
Last post by Jonathan S. Clough - April 25, 2017, 03:05:24 PM
More recent NWI shapefiles do not specifically identify dry land; dry land registers as "no-data" in the NWI dataset (as it are not wetlands!).  (Historic data sometimes used the "U" designation for upland.)

Because of this, dry land needs to be manually added using the "turn blank to dry land" button.  For that to work, optimization needs to be turned off in the file setup window.  Also elevation data need to be present as it is how the model discerns dry land from open water when adding dry land.  Another option is to use the "fill cells" feature, but dry land usually bleeds into open ocean in that case.

Hope this is helpful -- send a screen capture or more information if not, please.  Best -- Jonathan
Using SLAMM / Re: Issue registering elevatio...
Last post by pse1999 - April 21, 2017, 05:25:28 PM
Thanks for the reply Marco.

I think what I meant was, do I need to add a cell into the NWI/SLAMM table to denote dry land much like I would do for any missing wetland class types? Does that make sense?
Using SLAMM / Re: Issue registering elevatio...
Last post by marco.propato - April 20, 2017, 08:52:26 AM
I am not sure I have completely understood the question.

If you have already a land cover layer with dry land cells then the problem may be in the elevation layer.

If your land cover layer has blank cells in the dry land portions, then the problem may be that you have some optimization selected in the File Setup window. First, you have to select "Track all cells" in the File Setup window. After loading the map you should be able to see the elevations in the blank cells and then convert blank to dry land. After saving the new land cover layer with filled dryland you can select again the optimization you desire in the File Setup window.

If you do not solve the problem, probably it would be best to have a look at the elevation and land cover layers.

Using SLAMM / Issue registering elevation of...
Last post by pse1999 - April 17, 2017, 03:21:47 PM
I was just curious if anyone could help with an issue I am having in SLAMM reading elevations on the dry land portions of my Study Area. It appears that whenever I hover over it, it reads "999" which is essentially no data. Is there something I have to do to the crossover table or to one of the input layers? Turn blank to dry land doesn't appear to be effective either.

Thanks in advanced!
Using SLAMM / Re: Latest Versions of SLAMM
Last post by Jonathan S. Clough - April 12, 2017, 11:53:30 AM
SLAMM 6.7 is now on GitHub!

Build 236 is now available with a few minor bug fixes:

  • Connectivity to inland-open water was inadvertently considered equivalent to connectivity to tidal water.  That has been corrected.

  • Conversion from SLB files to ASC files was fixed

The 64-bit installer is here:
Using SLAMM / Re: Latest Versions of SLAMM
Last post by Jonathan S. Clough - March 02, 2017, 02:30:25 PM
An updated version of SLAMM 6.7 is posted on the release page today (3-2-2017).  Build #234.

The errors fixed are:

  • Fixed an interface bug in which histograms were not displaying properly in "classic SLAMM category mode"

  • Fixed a bug in which calculation of elevation statistics could cause Range-Check-Error in "classic SLAMM category mode"

  • Fixed a bug in which GIS outputs could be out of sequence in "classic SLAMM category mode" (especially tidal swamp)

  • Corrected wording in Tech Doc -- tidal fresh marsh converts to irregularly flooded marsh not "transitional marsh" in "California" mode.

  • Added units to wind-rose input (10 meter, 10 minute avgs.)

Sorry about the delay in response.  

This was an error in SLAMM 6.7 output to GIS files.  

It has been fixed in a maintenance output that I'm posting today. See


Using SLAMM / Re: Out of Memory error messag...
Last post by Jonathan S. Clough - March 02, 2017, 07:42:54 AM
I am not an ArcMap user but I'd guess that you need to use a 64 bit operating system and more RAM if you can upgrade your computer.  It is good that RAM is inexpensive as SLAMM and GIS software tends to use a lot of memory!  That is more important, generally, than CPU speed at this point. 
Using SLAMM / Out of Memory error message in...
Last post by pse1999 - February 26, 2017, 03:48:16 PM
I keep getting an out-of-memory error message in ArcMap when trying to create an attribute table through the wetland input raster in preparation to use it in the SLAMM model. Has anyone run into this issue before? Solutions? I am assuming it has to do with processing power.
Using SLAMM / Re: NWI
Last post by kij4 - February 22, 2017, 06:23:33 AM
Thank you!

I got it working in the end, I followed the steps on the other thread but wasn't working. My friend got it working after noticing the file wasn't exporting properly!

Thank you for your assistance though.
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