The Elevation Map (also named Height Map) is 2.5D grid-based map where the value of each cell is an estimated height.

In the Elevation Map the values are stored as doubles. Additional to default grid functionality, e.g. access a grid cell, the Elevation Map offers follower functions:

• calculate normal of the cell getNormal()
• calculate mean elevation of the cell getMeanElevation()

In both cases the calculation is down over 3x3 neighbourhood of the cell.

(TODO: operation for the projection)