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is there any Java API in Geotools JTS lib for calculating area of 3D plane? Same about Line, where points have three dimensions.

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No, in general the difference in height between two points is negligible compared to the distance between them.

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  • so I can consider only x,y during area, perimeter and lenght calculation, right?
    – Capacytron
    Sep 17, 2018 at 12:42
  • depends are your polygons small and the mountains very big
    – Ian Turton
    Sep 17, 2018 at 17:18
  • Could an area of mountain surface be much bigger than 2D projection of mountain on a plane? matematikalegko.ru/wp-content/uploads/2014/03/120.gif Pyramid projection on the 2D plane could be much (3 and more times) smaller than actual pyramid surface.
    – Capacytron
    Sep 17, 2018 at 20:17
  • Most mountains are a few 1000 metres but 10s or 100s km wide
    – Ian Turton
    Sep 17, 2018 at 20:41
  • Is it true for relatively small objects like house roofs, bridge slope?
    – Capacytron
    Sep 18, 2018 at 9:15

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