Classification of open source intelligence in military operations
Generally, under intelligence, the U.S. military divides open-source intelligence used in military operations into three categories: strategic intelligence, operational intelligence, and tactical intelligence.
                                     
                                
Strategic intelligence 
 Strategic intelligence refers to the
                                    intelligence needed to formulate policy or military plans at the national and
                                    international levels. Strategic intelligence operations need to consider the entire
                                    nation, months, years, and beyond. The information mainly involved can be divided
                                    into the following nine aspects: 
1. Character (biographical) information
                                    
 Refers to current and potential important people and their backgrounds,
                                    personalities, etc. Including: education and career experience; personal
                                    achievement; hobbies, habits; position, influence and potential; business hobbies
                                    and value orientation. 
 2. Economic Intelligence 
 Including:
                                    economic warfare; economic vulnerability; manufacturing; sources of economic power.
                                    
3. Social intelligence 
It mainly examines society, groups in society
                                    and their composition, organization, purpose, habits, and the role status of certain
                                    individuals in social organizations. Including: population, labor force; people's
                                    cultural and material living conditions; public opinion; education; religion; public
                                    health and welfare. 
4. Traffic information 
That is, information
                                    about the facilities and operations of foreign transportation systems. Including:
                                    railways; highways; waterways, waterways; oil and gas pipelines; ports; commercial
                                    shipping; aviation. 
 5. Telecommunications Intelligence 
That is,
                                    information about foreign civilian and military fixed communication system
                                    facilities and operations. Including: radio; television; telephone; telegraph;
                                    submarine cables; media. 
6. Military Geography 
 Geography is the
                                    science that describes the distribution of land, sea, sky, and flora and fauna
                                    (including humans, industry, etc.). Military geographic intelligence is the
                                    assessment of all geographic factors that may affect military operations in some
                                    way. Including: description; natural landforms; man-made landforms; names of various
                                    parts; topographical landforms; human and cultural geography. 
7. Armed
                                    Forces Intelligence 
That is, the comprehensive study of foreign organized
                                    land, sea, and air forces (both existing and potential). Including: a country's
                                    strategic military issues, involving geopolitical, terrain, economic, political and
                                    other factors, as well as the use of weapon systems, the use and actions of various
                                    arms and services, special operations training, logistics, organization, and
                                    military strength. 
8. Political Intelligence 
Political intelligence
                                    is information about foreign and domestic government policies and political
                                    movements. Including: Fundamentals of Government, National Policy; Government
                                    Structure; Foreign Policy; Political Organizations, Parties; Political Procedures;
                                    Public Order and Safety; Subversive Activities; Intelligence and Security
                                    Organizations; Propaganda. 
9. Scientific and technical information 
That
                                    is, the study and assessment of foreign scientific and technological capabilities
                                    and their potential to support their goals through the development of new weapons
                                    and equipment. Including: new weapons and equipment; missiles and space; nuclear,
                                    biological and chemical; basic science and applied science. 
Operational
                                        intelligence 
Operational intelligence refers to the geographic
                                    resources, regional situation, social factors, religious composition, and logistical
                                    support within the jurisdiction of the theater. 
Tactical
                                        intelligence 
Tactical intelligence refers to the intelligence
                                    needed to plan and execute tactical operations. Tactical intelligence operations
                                    should be adapted to military operations on the battlefield, usually in direct
                                    contact with the enemy, and need to face villages, towns, or local tribes and
                                    people. For example: geospatial information, weather conditions, public psychology,
                                    civil infrastructure, transportation network, imaging system, etc.