3
<EM>v.qcount</EM> chooses <B>n</B> circular quadrats of
4
radius <B>r</B> such that they are completely within the
5
bounds of the current region and no two quadrats overlap.
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The number of points falling within each quadrat are counted
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and indices are calculated to estimate the departure of
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point locations from complete spatial randomness.
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This program may not work properly with lat-long data. It uses
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in two files: <EM>count.c</EM> and <EM>findquads.c</EM>.
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<EM><A HREF="v.random.html">v.random</A></EM>
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<EM>Complete Spatial Randomness and Quadrat Methods</EM> -
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GRASS Tutorial on <EM>v.qcount</EM>
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(only available as older file s.qcount-tutorial.ps),
28
General references include:
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<EM>Statistics for Spatial Data</EM>.
34
Wiley Series in Probability and Mathematical Statistics. John Wiley
35
& Sons, New York, NY, 1st edition, 1991.
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<EM>Spatial Statistics</EM>.
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John Wiley \& Sons, New York, NY, 1981.
46
References to the indices include:
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F. N. David and P. G. Moore.
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Notes on contagious distributions in plant populations.
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<EM>Annals of Botany</EM>,
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J. B. Douglas. Clustering and aggregation.
63
R. A. Fisher, H. G. Thornton, and W. A. Mackenzie.
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The accuracy of the plating method of estimating the density of
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bacterial populations.
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<EM>Annals of Applied Biology</EM>,
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<EM>Journal of Animal Ecology</EM>,
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Measuring the dispersion and analysis of distribution patterns.
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<EM>Memoires of the Faculty of Science, Kyushu University, Series E.
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Biology</EM>, 2:215-235, 1959.
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Timestamp not working for header part of counts output. (2000-10-28)
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Please send all bug fixes and comments to the author
88
or the grass development team. <br>
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<a href="http://grass.itc.it"><tt>http://grass.itc.it</tt></a>.
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<A HREF="http://mccauley-usa.com/">James Darrell McCauley</A>
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<A HREF="mailto:darrell@mccauley-usa.com"><darrell@mccauley-usa.com></A>,
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<A HREF="http://ABE.www.ecn.purdue.edu/ABE/">Agricultural Engineering</A>
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<A HREF="http://www.purdue.edu/">Purdue University</A>
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Modified for GRASS 5.0 by Eric G. Miller (2000-10-28)
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Modified for GRASS 5.7 by R. Blazek (2004-10-14)
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<p><i>Last changed: $Date: 2004-12-06 11:45:44 +0100 (Mon, 06 Dec 2004) $</i>