Multi-Temporal Pixel Trajectories of SAR Backscatter and Coherence in Tropical Forests

Elsa Carla De Grandi, Edward Mitchard, Astrid Verhegghen, Dirk Hoekman, Francesco Holecz
2015 Proceedings of 1st International Electronic Conference on Remote Sensing   unpublished
Tropical forest natural and anthropogenic changes can be tracked using a pixel based time-series analysis of multi-temporal Interferometric Synthetic Aperture Radar (InSAR) backscatter and coherence provided by TanDEM-X. A pixel trajectory is defined as a set of values of all resolution elements (backscatter or coherence) at the same row and column position in the stack of images. Analysis of the trajectories over an area by means of a set of parameters (features) that characterize its time
more » ... terize its time evolution can give insight on the nature and changes of tropical forest due to disturbance events (e.g. deforestation) but also due to natural changes in environmental conditions (e.g. rainfall). The following set of trajectory features was computed: linear fitting (trend), dispersion around trend (RMSE), maximum change (swing), statistics of the trajectory finite difference at one step (variance and intermittency). Results indicate that linear regression parameters captured changes due to forest/non forest conversion. The study reports results from a highly disturbed tropical forest environment in the Republic of Congo.
doi:10.3390/ecrs-1-d014 fatcat:24v47lmwqfaslat7t4t3zciqdq