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I successfully import a polygon shapefile with readOGR, however the information in the .prj file is not being imported.
test class : SpatialPolygonsDataFrame nfeatures : 19407 extent : 35551.4, 1585917, 6318047, 9408727 (xmin, xmax, ymin, ymax) coord. ref. : NA
summary(test) Object of class SpatialPolygonsDataFrame Coordinates: min max x 35551.4 1585917 y 6318047.3 9408727 Is projected: NA proj4string : [NA]
the projection should be utm21n complex zone