The key points from this module are:
A survey is an act of making measurement of the relative position of natural and manmade features on the earths surface and the presentation of this information either graphically or numerically.
The Stages of Survey
Taking a general view
Observation and measurement
Presentation of data
Sources of Error in Survey
Natural error: Due to variability in natural conditions
Instrumental error: Due to imperfections in the instrument
Personal error: Due to the user of the instrument
Photogrammetry is the science and technology of obtaining spatial measurements and other geometrically reliable derived products from photographs.
LIDAR (Light Detection and Ranging) is an active remote sensing technique that requires the use of airborne laser scanning to determine the location and other properties of an object.
Components of LIDAR
Scanner and optics
Photodetectors and receiver electronics
Position and navigation systems
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