Mapping Toolbox

Extracting Polygon or Line Segments

It may be difficult to identify line or patch segments once they have been combined into large NaN-clipped vectors. You can separate these polygon or line vectors in their component segments using polysplit. The results is cell arrays in which each element contains a segment. To reverse the results of polysplit, use polyjoin.

[latc,lonc] = polysplit(lat,long);
[latc{2} lonc{2}]

ans =

         43.9            0
       -67.14       -114.2
           90          -18
          -89            0

[lat2,lon2] = polyjoin(latc,lonc);
[lat long]

ans =

         45.6           13
       -23.47       -97.45
           78          165
          NaN          NaN
         43.9            0
       -67.14       -114.2
           90          -18
          -89            0

Segments versus Polygons

Merging Line Segments