A computer implemented method of encoding data representing a triangle mesh having a plurality of vertices wherein the vertices correspond to points on regular uniform X-Y grid with a variable Z value at each grid point is disclosed. The method comprising encoding data representing the content of the elevation mesh by selecting and processing groups of data points corresponding to pairs of adjacent triangles in the mesh in an order which traverses the mesh. Encoding data in this way results in encoding data having many repeated values which renders the encoding particularly susceptible to data compression.
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