A Tower-Based Radar Study of Temporal Coherence of a Boreal Forest at P-, L-, and C-Bands and Linear Cross Polarization
Journal article, 2021

Cross-polarized temporal coherence observations of a boreal forest, acquired using a tower-based radar, are presented in this article. Temporal coherence is analyzed with respect to frequency, temporal baseline, time of day of observation, season, meteorological variables, and biophysical variables. During the summer, P- and L-band temporal coherence exhibited diurnal cycles, which appeared to be due to high rates of transpiration and convective winds during the day. During the winter, freeze-thaw cycles and precipitation resulted in decorrelation. At temporal baselines of seconds to hours, a high temporal coherence was observed even at C-band. The best observation times of the day were midnight and dawn. Temporal coherence is the main limitation of accuracy in interferometric and tomographic forest applications. The observations from this experiment will allow for better spaceborne SAR mission designs for forest applications, better temporal decorrelation modeling, and more accurate forest parameter estimation algorithms using interferometric and tomographic SAR data.

BorealScat

tower

P-band

coherence

C-band

L-band

boreal forest

decorrelation

Author

Albert Monteith

Chalmers, Space, Earth and Environment, Microwave and Optical Remote Sensing

Lars Ulander

Chalmers, Space, Earth and Environment, Microwave and Optical Remote Sensing

Swedish Defence Research Agency (FOI)

IEEE Transactions on Geoscience and Remote Sensing

0196-2892 (ISSN)

Vol. In Press

Subject Categories

Remote Sensing

Meteorology and Atmospheric Sciences

Physical Geography

DOI

10.1109/TGRS.2021.3074098

More information

Latest update

6/14/2021