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    If you want to remove all polygon 'borders', you could try running the Dissolve tool on your layer. Commented Oct 17, 2016 at 13:41
  • thanks joseph - i've tried that but it leads to the same result. Commented Oct 17, 2016 at 14:41
  • May be you have geometry issues Commented Oct 17, 2016 at 14:51
  • Probably the vertices of adjacent polygons are not exactly the same and therefore the boundaries are not merged. You should snap the vertices with a reasonable tolerance as the first step. Commented Oct 17, 2016 at 15:38
  • thanks for your comments, which gave me some ideas. the vertices are ok, the problem was with the projection. Commented Oct 17, 2016 at 17:15