[geos-devel] Union of XYZ or XYM polygons
seboricor
seboricor at gmail.com
Mon Feb 13 01:36:57 PST 2017
Hello,
I would like to know if it is planned that GEOS implements union of XYM
or XYZ polygons ?
I think it would be very interesting that the union of XYZ (or XYM)
polygons returns an XYZ polygon and not only an XY (something as shown
in the joined drawing)
It is for a personnal project (isochron implementation of a sailing
route predictor with R).
Regards
Sébastien SAILLET (France)
PS : the small test I did with R
require(sf)
outer = matrix(c(0,0,111,10,0, 222,10,10,333,0,10,444,0,0,111),ncol=3,
byrow=TRUE)
pol1 = st_polygon(list(outer), dim="XYZ")
outer2 = matrix(c(5,5,1111,15,5,
2222,15,15,3333,5,15,4444,5,5,1111),ncol=3, byrow=TRUE)
pol2 = st_polygon(list(outer2), dim="XYZ")
(pol3 = st_union(pol1, pol2))
note that if I use "XYM", the last line returns an error
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