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...I search a function which returns the contour of map with levels like contourLines, but I would like this function return the border of the map too, because the function contourLines cannot consider the corner of the map and it is not adapted to fill polygon after that. Thanks in advance Pierre Bruyer

...inates of my points and z is evaluate to a qualitative elevation and his representation is a set of colors, which is define by levels. The problem is the curve of my contour is so linear, and I would like a more continuous contour. I use the function fitted.contour to draw my map. Thanks, Pierre Bruyer