Displaying 2 results from an estimated 2 matches for "sppoint".
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lppoint
2005 Jun 28
2
function for cumulative occurrence of elements
...uot;Table", I can construct a data set that lists the occurrence of a
species at any Point (it produces a binary 0/1 data table). From there it
get confusing, regarding the most efficient approach to determining the
addition of new and or repeated species occurrences.
ptcount <- table(sppoint.freq$species, sppoint.freq$Point)
From here I've played around with colSums to calculate the number of species
at each Point. The difficulty is determining if a species is new or
repeated. Also since there are 1009 points a function is needed to screen
every Point.
Two goals are of in...
2012 Sep 02
1
why variations in accuracy between R to ARCGIS for the same point reprojection?
...e of the
change can be up to 40 km in the poles.
Basically, I have a database of points equally separated by one degree
over the globe.
In ARCGIS, I am projecting the data in GCS-WGS-1984 and then
reprojected it to Berhmann to ensure equal area distribution of the
points.
In R, I am using:
spPoint <-
SpatialPoints(coords=coordinates(Data),proj4string=CRS("+proj=longlat
+datum=WGS84"))
and then reprojecting it to Berhmann with:
spPointReprj=spTransform(Data,CRS("+proj=cea +lon_0=0 +lat_ts=30
+x_0=0 +y_0=0 +ellps=WGS84"))
If I put the two outputs of the reprojecti...