[R] Using XY location data to calculate ecological parameters
ONKELINX, Thierry
Thierry.ONKELINX at inbo.be
Tue Sep 12 16:05:14 CEST 2006
Assuming you only use the X direction to split the data into 10 m cells.
table(list(Species, round(X, digits = -1)))
This will generate a table with the number of seedlings per species in
each 10 m cell. Divide this by the area of each cell and you get the
densities.
Cheers,
Thierry
------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx op inbo.be
www.inbo.be
-----Oorspronkelijk bericht-----
Van: r-help-bounces op stat.math.ethz.ch
[mailto:r-help-bounces op stat.math.ethz.ch] Namens James R. Milks
Verzonden: dinsdag 12 september 2006 15:36
Aan: r-help op stat.math.ethz.ch
Onderwerp: [R] Using XY location data to calculate ecological parameters
Dear R gurus,
I have XY data giving the locations of tree seedlings that were
surveyed during a 210 meter belt transect. This belt transect was
taken by stretching a line across the field, then measuring all
seedlings within 1 meter on either side of the line. The end result
was XY coordinates and height for ~1,300 seedlings. I would like to
use that data to calculate density of seedlings per 10 meters per
species and relative species abundance in order to compare between
this transect and other transects as well as to compare between
segments of the same transect. Are there any R packages out there
that will allow me make those calculations? To give an idea of my
data, here's a fictional example:
Species X (m) Y(m)
Acer negundo 90.10 -.19
Acer negundo 90.14 -.90
Acer saccharinum 90.25 .54
Acer rubrum 90.89 .21
Acer negundo 91.25 .36
Acer negundo 91.46 -.65
etc.
Thanks.
Jim Milks
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