Surveying
If the general ground level of any area is 10% of the flying height, the principal points may be used as the centers of radial directions for small scale mapping even in tilted photograph up to

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of any two sides is greater than the third
Sum of the three angles is equal to two right angles
Sum of the three angles less than six right angles and greater than two right angles
Every angle is less than two right angles

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Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
is not suitable for levelling with tilting levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method

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