April 22, 2018, 02:12:34 AM


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Messages - Jonathan S. Clough

The input files look good but there was one key issue.  The CRS units for SLAMM projects must be meters.  I am sorry if that has not been made clear enough through the GUI and/or users guide.  I will specify that on the file-input GUI for the next version .

Best regards -- Jonathan
If you are using a dike layer I would turn that off as a test.

Next thing to do is look at the elevation analysis -- Set Map Attributes, Elevation Analysis button towards middle of Analysis Tools tab.  Then "Run Elevation Analysis (This Site)  Double click on the category names to sort, sorting by n cells can be useful.  The 5th percentile for wetland classes should be around the minimum elevation. 

See the help file text for more information on interpreting the matrix on that page.  Also you can see this reference:


If you want to email me the SLAMM6 and spatial files I will take a look at it, or you can just email the elevation-analysis matrix after exporting to Excel for now.

Good luck!  -- Jonathan
I ran multiple tests and, for my study files, when there is no dike input raster map, the maps produced have been identical whether "use dikes" is checked or not.  Are you willing to share your input files so that I can look into this further?   Regards -- Jonathan
If you do not have a dike file specified, the results should be identical.  Please let me know which version you are using and I'll run a test and ensure there is not a software bug causing this problem.
Using SLAMM / Re: Data Set
November 10, 2017, 02:14:58 PM
As you know, NRow and NCol and "lower left corner attributes" must match precisely.

In the QGIS world we use GDAL WARP to ensure that this is the case.

It is best to set the attributes precisely when converting from NWI polygons into a raster because re-projecting or moving raster files can result in data loss.

I cannot speak to the ESRI world -- anyone else?

Best regards -- Jonathan
I think the problem is that the ASCII DEM is treating 1.17e-38 as its NODATA value.  The GIS software is then not recognizing this NODATA value.  Try specifying a NODATA value of -9999 prior to conversion and this may solve the problem. 

Also, look at the header in the first lines of the ASCII DEM to see if that helps understand the problem (the NODATA value is defined there.)  The best way to do this is convert the file type to a TXT file and look at it in the Windows Explorer Preview pane (not Internet Explorer, just the Windows Explorer file manager).

Hope this is useful.
Model Formulation & Parameters / SLAMM DMMT Webinar
September 28, 2017, 07:23:42 AM
On November 3rd, at 10:30 AM EST, Warren Pinnacle Consulting Inc. will present the results of a multi-year sea-level rise modeling project supported by the New York State Energy Research and Development Authority (NYSERDA). This project has produced a new decision-support tool designed to help decisionmakers understand the benefits of different adaptation strategies for wetland management under uncertain future conditions. The presentation will focus on background of the project and results from three New York county case studies, as well as presenting a tutorial for users interested in learning how to use the tool.

SLAMM Marsh-Management Tool
Friday, November 3, 2017

10:30 am  |  Eastern Daylight Time (New York, GMT-04:00)  |  1 hr 30 mins
After your request has been approved, you'll receive instructions for joining the meeting.

Need help? Go to http://help.webex.com.

Prioritization of marsh-management strategies can be a difficult undertaking. Ideally, a manager could evaluate the relative benefits of adaptation strategies and maximize wetland benefits while considering uncertainty both in future sea-level rise and dynamic marsh response. Warren Pinnacle has developed a modeling framework to evaluate the costs and benefits of management strategies while accounting for these uncertainties using the SLAMM marsh migration model. Model results are combined with ecosystem-valuation assessments from stakeholders that define a set of relative "wetland benefits" (e.g., habitat preservation, flood protection), and each site's wetland benefits can then be projected into the future and compared to the estimated costs for each adaptation strategy. By calculating the "wetland benefits per estimated cost" ratio, one can identify the most effective marsh management strategies.

Model Formulation & Parameters / Re: Min/Max Accretion
September 12, 2017, 09:59:02 AM
To understand these curves and parameters, please see the spreadsheet:


Which is installed along with SLAMM. 

You will see that the equations describe a third order polynomial which then can be scaled to the min and max accretion values.  That allows you to play games keeping the shape of the feedback curve intact but increasing or decreasing the minimum and maximum accretion values as part of a sensitivity or uncertainty analysis.

Let me know if you can't find the spreadsheet or have additional questions.
We have converted these to georeferenced compressed TIFF files and put them here:


We generally deliver data as GEOTIFF files now as they are georeferenced, well compressed (lossless), and quickly imported into any GIS software.

The problem was, the files were originally run and projected by TNC Florida (our project was designed to utilize previous work completed), and they chose the projection of NAD83 Florida West.  We did not reproject their raster files and ASC files do not carry their projection with them, thus resulting in the confusion.

Hope this is useful -- please let us know if you have any other questions or concerns!

-- Jonathan & Marco
Thanks for the heads up -- we will look at this issue tomorrow.

Best -- Jonathan
Using SLAMM / Re: Latest Versions of SLAMM
June 21, 2017, 03:05:16 PM
We're up to Build 239

Editable Max Fetch for Marsh -- Marsh horizontal erosion rates will now be applied when this editable marsh fetch has been exceeded for each marsh cell (previously this was hard-wired at 9km and this value will be loaded into older SLAMM6 simulations.).  This may be edited on a subsite by subsite basis.  This parameter is not relevant if the wave-energy erosion submodel is being utilized.

Also the "Last year of simulation variable" is always utilized even if "run specific years" is selected.  The interface was modified to make this more clear.

Now on GitHub https://github.com/WarrenPinnacle/SLAMM6.7

Editable Max Fetch Threshold for Marsh Erosion -- Marsh horizontal erosion rates will now be applied when an editable marsh fetch has been exceeded for each marsh cell (previously this was hard-wired at 9km and this value will be loaded as a default into older SLAMM6 simulations.).  The threshold may be edited on a subsite by subsite basis.  (This parameter is not relevant if the wave-energy erosion submodel is being utilized.)

We meant to add this as a feature of SLAMM 6.7 initially, but got so caught up in the new fancy wave power formulation that we forgot to modify the basic model.

Also -- the "Last year of simulation" variable is always utilized even if "run specific years is selected."  The interface was modified to make this more clear.
Using SLAMM / Re: Storm Surge Raster?
May 04, 2017, 05:01:32 PM
Have you examined the users guide?  The input required is cell-specific flooding heights in units of NAVD88.  If you only have current storm surge height SLR will be added to it.  If you have SLR-specific maps those can also be accommodated though the file naming convention is rather inflexible.

What is your specific question?  Probably it would be best to start with the storm surge data that you have available and consider how to process that into the required raster format. 

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: Latest Versions of SLAMM
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:  https://github.com/WarrenPinnacle/SLAMM6.7/tree/master/INSTALL