[R] conversion of LL coordenates to UTM problems (ED50-WGS84 format)

From: Berta <ibanez_at_bioef.org>
Date: Wed 18 Oct 2006 - 10:27:21 GMT

Hi R-Users,
I have plotted a region whose polygon coordinates are given in shp format ED50 UTM (zone=30) ) using "readShapePoly" in library(maptools).

Now I need to plot a set of points in that region (my.dataframe, with X and Y geographic coordinates), which have been read using GPS in Longitud-Latitud form (using WGS84 system), so I first need to convert these Longitud-Latitud data into UTM data. To do so, I use package PBSmapping:

attr(my.dataframe, "projection") <-"LL" attr(my.dataframe, "zone") <- 30

obtaining the UTM coordinates. But when I plot them in the polygon region, points seem to be badly located. I suspect it is due to the ED50 UTM of the polygon versus WGS84 coordenates of the points. If this is the problem, is there a way to convert them into the same format? It it is not the problem, what am I doing wrong?

Thanks a lot in advance.

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