different between photoclinometry vs photoclinometer

English

photo- +? clinometry

photoclinometry (uncountable)

The estimation of slope information by the analysis of brightness distribution in a photograph of a geologic surface (such as a lunar crater)

photo- +? clinometer

photoclinometer (plural photoclinometers)

Any of several directional surveying instruments which record photographically the direction and magnitude of well deviations from the vertical.

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