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 on: April 27, 2017, 09:19:19 AM 
Started by pse1999 - Last post by pse1999
Hi Jonathan,

I am not sure what you mean by optimization? Is it the "track all cells" checkbox? If so, I did that and still, it gives me "999" No data for the dry land cells. I tried to convert blank to dry land and it would not track that either. One small success was filling the cells with upper dry land, even though received no elevation data. I've attached the pre-fill image here.

 on: April 25, 2017, 03:05:24 PM 
Started by pse1999 - Last post by Jonathan S. Clough
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

 on: April 21, 2017, 05:25:28 PM 
Started by pse1999 - Last post by pse1999
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?

 on: April 20, 2017, 08:52:26 AM 
Started by pse1999 - Last post by marco.propato
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.


 on: April 17, 2017, 03:21:47 PM 
Started by pse1999 - Last post by pse1999
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!

 on: April 12, 2017, 11:53:30 AM 
Started by Jonathan S. Clough - Last post by Jonathan S. Clough
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:

 on: March 02, 2017, 02:30:25 PM 
Started by Jonathan S. Clough - Last post by Jonathan S. Clough
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.)

 on: March 02, 2017, 02:03:58 PM 
Started by maryramirez - Last post by Jonathan S. Clough
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


 on: March 02, 2017, 07:42:54 AM 
Started by pse1999 - Last post by Jonathan S. Clough
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. 

 on: February 26, 2017, 03:48:16 PM 
Started by pse1999 - Last post by pse1999
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.

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