[GRASS-SVN] r42882 - in grass-addons/raster: . r.pi

Fri Jul 23 05:36:07 EDT 2010

Author: wegmann
Date: 2010-07-23 09:36:07 +0000 (Fri, 23 Jul 2010)
New Revision: 42882

Added:
   grass-addons/raster/r.pi/
   grass-addons/raster/r.pi/rpi_overview.html
Log:
first commit of the r.pi module set. Its modules provide patch based spatial pattern analysis. Actual code will follow soon.

Added: grass-addons/raster/r.pi/rpi_overview.html
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+</head>
+<body bgcolor="white">
+
+<img src="grass_logo.png" alt="GRASS logo"><hr align=center size=6 noshade>
+
+
+<H2>DESCRIPTION</H2>
+
+<EM>r.pi</EM> (raster patch index) provides various functions to analyse spatial attributes of a landscape. It has a focus on patch-based indices but delivers class-based indices as well. <EM>r.le</EM> and its successor <EM>r.li</EM> provide landscape indices.
+
+<P>
+A list with a short description of the <EM>r.pi</EM> modules can be found below. More in depth description of a certain module (commands, flags, options) can be found in the  respective folder (like <EM><A HREF="r.pi.graph/description.html">r.pi.graph</A></EM>). The functions/algorithms of the modules are not yet very extensive but will be expanded in the future. Please submit any bug/feature you might encounter to improve the functionality.
+<P>
+The program will interactively query the user for input, output and options (GUI). However the module can be also run from the terminal prompt (CLI) and might be implemented in e.g. a bash-script.
+<P>
+It is highly recommended to read the help pages or e.g the overview documents of <A HREF="http://www.umass.edu/landeco/research/fragstats/documents/fragstats_documents.html">Fragstats</A> to get a better impression of problems, possibilities and caveats.
+
+<!-- "<tt>end</tt>"  -->
+<P>
+
+
+
+
+<H2>OVERVIEW</H2>
+
+<H3>General and Connectivity Indices</H3>
+
+ <ul>
+   <li><b><A HREF="r.pi.index/description.html">r.pi.index</A></b>: Calculations of basic indices (area, SHAPE etc.) </li>
+   <li><b>r.pi.ENN</b>:  Area, SHAPE and distance to n-th Euclidean Nearest Neighbor</li>
+   <li><b>r.pi.FNN</b>:  Area, SHAPE and distance to n-th Functional Nearest Neighbor</li>
+   <li><b>r.pi.odc</b>: Area and distance to omnidirectional n-th Nearest Neighbors</li>
+   <li><b>r.pi.neigh</b>: Extraction of values of patches in defined buffer region</li>
+   <li><b>r.pi.prox</b>: Calculation of Proximity and Modified Proximity Index for patches in buffer region</li>
+   <li><b>r.pi.graph</b>: Various connectivity indices within the Graph Theory </li>
+ </ul>
+
+
+<H3>Individual-based migration models</H3>
+ <ul>
+   <li><b>r.pi.searchtime</b>:Searchtime and Immigration rate</li>
+   <li><b>r.pi.energy</b>: Immigration, Migration and successfull emigration rate</li>
+ </ul>
+
+<H3>Patch-Relevance</H3>
+ <ul>
+   <li><b>r.pi.ENN.iter</b>:Relevance of patches for maintenance of distance to first Nearest Neighbor</li>
+   <li><b>r.pi.searchtime.iter</b>:Relevance of patches for maintenance of searchtime</li>
+   <li><b>r.pi.energy.iter</b>:Relevance of patches for maintenance of immigration rate</li>
+   <li><b>r.pi.graph.red</b>:Relevance of patches by removing patches iteratively</li>
+   <li><b>r.pi.graph.dec</b>:Relevance of patches when threshold distance decreases</li>
+ </ul>
+
+<H3>Neutral Landscape Model</H3>
+ <ul>
+   <li><b>r.pi.nlm</b>: Generation of a neutral landscape</li>
+   <li><b>r.pi.nlm.stats</b>:Statistical analysis of landscapes based on permutation of neutral landscapes</li>
+ </ul>
+
+<H3>various modules</H3>
+ <ul>
+   <li><b>r.pi.corearea</b>:Calculation of core area based on costmatrix</li>
+   <li><b>r.pi.searchtime.mw</b>:Related to <EM>r.pi.searchtime</EM> but using a Moving Windows approach</li>
+   <li><b>r.pi.prob.mw</b>:Probability of two random points being in the same patch</li>
+   <li><b><A HREF="r.pi.rectangle/description.html">r.pi.rectangle</A></b>: Generation of rectangles based on coordinate points</li>
+   <li><b>r.pi.import</b>:Import of values to corresponding patches</li>
+   <li><b>r.pi.export</b>:Export of values from patches</li>
+   <li><b>r.pi.lm</b>:Residuals of a Linear Regression between 2 rasters are provided as raster</li>
+   <li><b><A HREF="r.pi.corrwin/description.html">r.pi.corrwin</A></b>:Correlation of pixels within a moving window of two raster files</li>
+
+ </ul>
+
+
+
+
+<H2>Disclaimer</H2>
+
+This software is released under the GPL license, hence also the limitation of liability.
+This software was designed for a certain project and its research questions. Its nomenclature might not be concordant with other software packages.
+Moreover its capabilities are yet limited and can not be compared to such of e.g. Fragstats, however every user is invited to extend, modify or fix the functionality of <EM>r.pi</EM> as long as the new code comply with the GPL.
+
+
+<H2>REFERENCES</H2>
+
+
+Wegmann, M., E. Shirinov, M. Schmidt and S. Dech (in prep.)
+
+
+
+
+<H2>EXAMPLES</H2>
+
+
+<h4>Calculation of the SHAPE-Index</h4>
+
+Input can be generated by <EM>r.pi.nlm</EM>, for example:
+
+<div class="code"><pre>
+r.pi.nlm output=NLM_in landcover=50 sharpness=0.5 #generate random landscape with 50% cover
+
+r.pi.index input=NLM_in keyval=1 output=NLM_in.shape method=shape #use the class 1 of the above generated landscape for computation of SHAPE-Index
+
+</pre></div>
+
+
+<h4>Calculation of the distance to the first and 10th Nearest Neighbor</h4>
+
+Input generated by <EM>r.pi.nlm</EM>, for example:
+
+<div class="code"><pre>
+r.pi.nlm output=NLM_in landcover=50 sharpness=0.5
+
+r.pi.index input=NLM_in keyval=1 output=NLM_in.enn1 method=ENN #first NN
+
+r.pi.ENN input=NLM_in output=NLM_in.enn10 method=distance number=10 #10th NN
+
+r.pi.ENN input=NLM_in output=NLM_in.enn10 method=distance number=1-10 #1-10th NN
+
+
+</pre></div>
+
+
+
+
+<H2>NOTE</H2>
+
+The maximum number of patches that can be queried at one time differs between modules.
+
+
+<H2>SEE ALSO</H2>
+
+<EM>
+<A HREF="r.li.html">r.li</A>,
+<A HREF="r.pi..html">r.pi.graph</A>,
+</EM>
+
+<H2>AUTHOR</H2>
+Programming: Elshad Shirinov<br>
+Scientific concept: Dr. Martin Wegmann <br>
+Department of Remote Sensing <br>Remote Sensing and Biodiversity Unit<br> University of Wuerzburg, Germany
+
+<p>
+<i>Last changed: $Date: 2009-04-03 10:01:00 +0200 (Mi, 03 March 2009) $</i>


Property changes on: grass-addons/raster/r.pi/rpi_overview.html
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Added: svn:executable
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