Geodetic imaging uses electromagnetic waves at radar and optical laser frequencies to quantify centimeter-scale motions at the Earth’s surface from on the order of a square meter to hundreds of square kilometers.
Synthetic Apeture Radar (SAR) sensors acquire amplitude and phase datasets for the same location at different times allowing for interferometric SAR (InSAR) showing relative ground displacements between the two datasets along the direction of the radar beam. Currently, UNAVCO curates datasets for select SAR satellites.
|SAR Satellites||1 - 20 m||wide-area deformation, frequent repeat|
|Airborne SAR||~1 m||broad area, planned surveys|
|Ground-based SAR||~1 m||focused area, continuous or planned surveys|
Laser scanning (lidar) instruments have a range of capabilities in terms of measurement range, sample rate, laser wavelength, laser spot size, physical size, weight, and power efficiency. UNAVCO maintains a pool of Terrestrial Laser Scanning (TLS) instruments that are available for Earth science research and has helped with regional geodetic surveys using Airborne Laser Scanning (ALS).
|TLS||1 - 10 cm||focused area, continuous or planned surveys|
|ALS||20 cm||broad area, planned surveys|
For more information about lidar systems, including spaceborne and high-altitude, please see the UNAVCO Knowledge Base on Comparison of Lidar Systems.
Last modified: 2019-12-24 01:47:05 America/Denver