Chaining on a Spherical ERMwith a Terrain Model Added

Represents a surveyor’starget (pole).

• Chaining is depicted in the AB plane view.

• The transit provides elevation angles.

• The distances aiai+1 are computed by spherical trigonometry and summed to yield AB.

• Angular measurements are not affected.

• Intervisibility is required.

• Gravity and thermal models could be added.

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