Geodetic Control in Surveying: Active vs. Passive

Aimed at surveyors and GIS professionals, this video explains the difference between active and passive control methods in surveying, and the strengths and weaknesses of each. Passive control is the traditional method of referencing positions to physical benchmarks that have known locations. In contrast, active control references positions to one or more Continuously Operating Reference Stations (CORS). These stations use continuous contact with global navigation satellite systems (GNSS/GPS) to provide highly accurate and updated positions.
For more information on geospatial infrastructure, visit geodesy.noaa.gov/.
For more information and a gallery of reusable resources from this video see www.meted.ucar.edu/training_m....
See COMET's MetEd website for hundreds of other geo-science training resources: www.meted.ucar.edu.

[@CpTeac]

Great resource!

[@mullinshinch]

Enjoyed that - thank you

[@ryden09]

nice info

[@rainyweather8685]

What any three gps shifting due to the magnetic field of Earth moving? Thank you.

[@timd9430]

Since I pay my phucking taxes and more than most, the US GOVT should provide access to CORS for FREE. Only a small handful of states do, but the rest charge about $1000 year to connect to them. BS.

[@samwakefield15]

It's flat