Elements Of Remote Sensing
Geodimeter is based on:

Propagation of infrared radiation
The visible light as carrier with frequency of the order of 5 × 1014 Hz
High frequency radio waves
Propagation of modulated light waves

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Elements Of Remote Sensing
Pick up the correct definition from the following with response to GIS.

The area features which are wholly contained within another area feature, is known so containment
All of these
Common boundary between two areas of a locality is known as adjacency
The geometric property which describes the linkage between line features is defined as connectivity

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