Dear all:

I have a shapefile in UTM coordinate system and I would like to transform it
to Lat/Log coordinates (WSG84).  The package PBSmapping contains function
convUL to transform between the two coordinate systems when data is in the
form of a data frame with attributes specifying the coordinate system.
However, when shapefiles are imported using function read.shape (package
maptools), a list instead of a data frame is generated.  I could extract all
the polygons in the list and transform them, individually, but I hope there
is an easier way of doing that.  Besides, the shapefile i'm trying to
convert has two different UTM zones (is from Guatemala, and it covers zones
15 and 16).  Any sugestions would be greatly appreciated.

Thanks,

Fredy

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