[Gfoss] [Fwd: [Qgis-developer] New plugin: SDA4PP (Spatial Data Analysis for Point Pattern)]

Paolo Cavallini cavallini a faunalia.it
Mer 3 Giu 2009 18:59:37 CEST


Impressionante.
Sono benvenuti i pareri, gli screenshots ecc.
Salutoni.
pc

-------- Messaggio Originale --------
The plugin performs analysis on point pattern spatial data. It uses
spatial analytical structure of R. The plugin communicates with R
through RPy2.

*The repo and docs are here:*

http://ggit.metu.edu.tr/~volkan/plugins.xml
<http://ggit.metu.edu.tr/%7Evolkan/plugins.xml>

*Used components' version:*

QGIS 1.0.2 / 1.1.0

Python 2.5.2

RPy2 2.0.3

R 2.9.0

NumPy 1.2.1

R packages: (spatstat_1.15-2, maptools_0.7-22, rgdal_0.6-7)

*Following tools are available in the plugin:*

*Interactive Identify Tool:* returns the value of overlapping raster and
vector layers in one window. It gives more information about feature
than the standard identify tool in QGIS. This tool is also available in
the repo as separate plugin.

*Quadrat analysis:* A method of point pattern analysis in which the
study region is sampled using a set of similar shapes (quadrats) and
counting the number of events in each. Analysis of the resulting quadrat
counts can help determine whether the pattern is evenly spaced or
clustered.

*F function:* A function in point pattern analysis based on the
cumulative frequency of the shortest distance between events in a point
pattern and a set of randomly placed locations in the study area.

*G function:* A function in point pattern analysis based on the
cumulative frequency of the shortest inter- event distances between
events in a point pattern.

*K function:* A function in point pattern analysis based on all the
inter-event distances between events in a point pattern.

*Kernel density estimation:* A method of density estimation making use
of kernel functions. For each event to be included in the density
estimates a kernel function is used to 'spread' its effect across space.

*Tested OS:*

XP professional Service Pack 3

XP professional 64 bit edition service pack 2 (qgis should be installed
under C:\Program Files, but not in C:\Program Files (x86). this is
required for this plugin, may not be for others.)

Ubuntu Desktop 8.10 intrepid ibex (R 2.7)


Please send bugs, opinions and suggestions;

to me: vkepoglu at gmail.com <mailto:vkepoglu at gmail.com>

or to my advisor: Assoc. Prof. Sebnem Duzgun duzgun at metu.edu.tr
<mailto:duzgun at metu.edu.tr>



-- 
Regards,
Volkan Osman Kepoglu
PhD Candidate
GGIT Department in METU,
Ankara, Turkey.

-- 
Paolo Cavallini: http://www.faunalia.it/pc


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