different between spotting vs detection

English

spotting

spotting (plural spottings)

A spotted pattern.
- 1954, Thomas H. Everett, The American Gardener's Book of Bulbs (page 161)
  Symptoms consist of various foliage spottings and blotchings.
The act of spotting or sighting something.
- 2009, Marine Corps (US), Close Air Support and the Battle for Khe Sanh (page 100)
  Although the NVA went to great lengths to conceal the locations of their artillery, they had to expose them at the time of firing. Less reliable than visual spottings were electronic intercepts […]

detection (countable and uncountable, plural detections)

The act of detecting or sensing something; discovering something that was hidden or disguised.
The finding out of a constituent, a signal, an agent or the like, mostly by means of a specific device or method.

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