Dear listers,
There is an interesting post here:
https://stackoverflow.com/questions/6989100/sort-points-in-clockwise-order
dealing on the issue. However, I would like to know if a function has
been already developped in a R package.
I am coping with a young colleague's shapefile where borders of
polygons have been drawn as lines quite inconsistently. To change this
SpatialLinesDataFrame into a SpatialPoints object is easy. The idea is
to? select the points? bordering each polygon (delete the others),
define the point set as a Polygon, then rebuild step by step a
SpatialPolygonsDataFrame with all its (~25) polygons. It would be much
quicker than to redraw one by one the 5160 data points (two times on
borders shared by two polygons).
The problem is that the points must be reordered clockwise (the way
lines making the? borders is all except clockwise) before making them
a polygon.
Any function already developped for that ?
Cheers,
Patrick