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