dear reseachers,

I wish to understand I can convert a data.frame in a SpatialPolygonDataframe
without using "convert.to.shapefile" of shapefiles library

thanks in Advance
Gianni

mydata <-
data.frame(Id=c("09G001_Plot513","09G001_Plot513","09G001_Plot513","09G001_Plot513",
"09G001_Plot513","09G001_Plot519","09G001_Plot519","09G001_Plot519","09G001_Plot519",
"09G001_Plot519"),X=c(750631.2,750634.8,750644.2,750640.6,750631.2,750921.3,750923.4,750933.2,750931.1,750921.3),

Y=c(7250205,7250214,7250211,7250201,7250205,7250200,7250209,7250207,7250198,7250200))

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