I am trying to project coordinates collected by GPS collars. The data is in decimal degrees and provides locations for two Sable antelope running around in Kruger NP South Africa.
After a wide search it seems that proj4R provides most options for projection of coordinates. However I can not get around the following error message when I try to project my coordinates using the Albers Equal Area Conic projection.
According to the proj4 pages, the following parameters should be supplied: http://www.remotesensing.org/geotiff/proj_list/albers_equal_area_conic.html PROJ.4 Organization +proj=aea +lat_1=Latitude of first standard parallel +lat_2=Latitude of second standard parallel +lat_0=Latitude of false origin +lon_0=Longitude of false origin +x_0=Easting of false origin +y_0=Northing of false origin
But when running the command in R, I get the following error message
> library(proj4R)
>
> res <- project(cbind(x, y), "+proj=aea +lon_0=24 +lat_0=0 +lat_1=18s +lat_2=32s +x_0=0 +y_0=0 ") #
Error in project(cbind(x, y), "+proj=aea +lon_0=24 +lat_0=0 +lat_1=18s +lat_2=32s +x_0=0 +y_0=0 ") :
major axis or radius = 0 or not given
>
I have also tried:
> res <- project(cbind(x, y), "+proj=aea +lon_0=24 +lat_0=0 +lat_1=-18 +lat_2=-32 +x_0=0 +y_0=0 ") #
with the same error.
Any suggestions?
Thanks,
Sander.
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