thanks for help. I have a polygon shapefile but I have a problem to read
with readOGR
sample <- readOGR(".", "sample")
OGR data source with driver: ESRI Shapefile
Source: ".", layer: "sample"
with 766 rows and 4 columns
Feature type: wkbPolygon with 2 dimensions
Errore in validityMethod(object) : ring not closed
thanks Gianni
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