It is encyclopedic in nature as opposed to being estimative or technical intelligence analysis.
Basic intelligence needs to be comprehensive, systematically organized, and updated periodically to account for changes.
Unclassified basic intelligence, such the CIA Factbook, is often used by the general public as reference material about foreign countries.
Basic intelligence includes details of orders of battle, equipment capabilities, personalities, infrastructure, socio-political, economic and environmental aspects.
We derive basic intelligence through routine monitoring or on a contingency basis.