Surveying
The height displacement on a vertical photograph

All listed here
Decreases as the flying height increases
Increases as the horizontal distance increases from the principal point
Increases as the ground elevation increases

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Surveying
The First Point of Aeries

All listed here
Is usually denoted by the Greek letter ?
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
Is the point in the celestial sphere where zero meridian crosses the celestial equator

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