This is a list of intelligence gathering disciplines.
Human intelligence--gathered from a person on the ground.
Geospatial intelligence--gathered from satellite, aerial photography, mapping/terrain data
Measurement and signature intelligence:
Open-source intelligence--gathered from open sources.
Can be further segmented by source type; Internet/General, Scientific/Technical and various HUMINT specialties (e.g. trade shows, association meetings, interviews, etc.)
Signals intelligence--gathered from interception of signals
Technical intelligence--gathered from analysis of weapons and equipment used by the armed forces of foreign nations, or environmental conditions.
Cyber Intelligence/Digital Network Intelligence--gathered from cyberspace
Financial intelligence--gathered from analysis of monetary transactions
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