[geos-devel] Union of XYZ or XYM polygons

[seboricor]

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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