Dear GRASS users/developers,<br><br> I'm happy to announce that the Mediterranean Landscapes Dynamics Project has released a brand new version of our landscape evolution script "<a href="http://r.landscape.evol.py">r.landscape.evol.py</a>". It can be downloaded from the GRASS ADDONS SVN Repository in the LandDyn directory (<a href="http://trac.osgeo.org/grass/browser/grass-addons/LandDyn">http://trac.osgeo.org/grass/browser/grass-addons/LandDyn</a>).<br>
<br> "<a href="http://r.landscape.evol.py">r.landscape.evol.py</a>" calculates erosion and deposition values for a region (DEM) given climactic (rainfall) and environmental (vegetation and soils) conditions. It can iteratively calculate these values over multiple time-steps, and will produce new surface DEM's for each time step (using the previous DEM as input in the next time step). "<a href="http://r.landscape.evol.py">r.landscape.evol.py</a>" uses process-based transport equations to calculate erosion/deposition differently for different parts of the landscape (ie. flat areas, hillslopes, mass movement, small channels, streams).<br>
<br> The latest release fixes several small programing issues, and implements a new algorithm for calculating erosion/deposition in stream channels. It takes advantage of the advanced MFD flow routing capabilities of the newly updated r.watershed module, which produced more accurate stream networks, and flow accumulation values. "<a href="http://r.landscape.evol.py">r.landscape.evol.py</a>" uses process equations that capitalize on the strengths of the MFD algorithm. Additionally, "<a href="http://r.landscape.evol.py">r.landscape.evol.py</a>" has been completely rewritten in Python, with improved speed and in keeping with the direction of GRASS programing. We have also uploaded a very detailed help file, which explains the program, the equations, and their variables in great detail.<br>
<br> We encourage everyone to download and use the module, but if you do so, we request that 1) please let us know how it works, and provide us with any errors or anomalies you may discover, and 2) that if you publish research that uses "<a href="http://r.landscape.evol.py">r.landscape.evol.py</a>", you credit the Mediterranean Landscape Dynamics (MEDLAND) Project of Arizona Sate University, and developers Isaac I. Ullah, C. Michael Barton, and Helena Mitasova, and mention that the module development was funded by NSF Grant <meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 11"><meta name="Originator" content="Microsoft Word 11"><link rel="File-List" href="file:///C:%5CDOCUME%7E1%5Ciullah%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml"><style>
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</style><span style="font-size: 10pt; font-family: "Palatino Linotype";" lang="EN-GB">BCS-0410269</span>.<br><br> Please also note that there are many other scripts in the LandDyn addons directory. These are related to the Mediterranean Landscape Dynamics Projects modeling laboratory, where we are simulating early agropastoral landuse (farming and herding), and tracking their effects on landscapes (erosion/deposition rates and vegetation) through time. You may also find these other scripts of use, and we encourage you to try them as well (with the same requests for error reports and credits is used in publications). Most of these scripts are quite stable, but have not yet been documented to the extent that <a href="http://r.landscape.evol.py">r.landscape.evol.py</a> has been (ie., I have yet to write html manual pages for them). However, I have done my best to internally document them by creating abundant comments in the source code.<br>
<br clear="all"><br>Cheers,<br>-- <br>Isaac I Ullah, M.A.<br><br>Archaeology PhD Candidate,<br>ASU School of Evolution and Social Change<br><br>Research Assistant,<br>Mediterranean Landscape Dynamics Project<br>***************************************************<br>
<a href="mailto:isaac.ullah@asu.edu">isaac.ullah@asu.edu</a><br><a href="mailto:ullah@archaeologist.com">ullah@archaeologist.com</a><br><br><a href="http://www.public.asu.edu/~iullah">http://www.public.asu.edu/~iullah</a><br>
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