What are primary sources of geographical data

Primary sources of geographical data include:

1. Airborne and satellite imagery
2. Maps and atlases
3. Census and demographic data
4. Earth observation sensors
5. Field surveys and measurements
6. GPS and other positioning technologies
7. Weather and climate data
8. Geospatial databases and archives
9. Remote sensing technologies
10. Aerial photographs
11. Unmanned aerial vehicles (UAVs)
12. Hydrological data
13. Soil data
14. Seismic and geological data
15. Land-use and land-cover data.