Seasonal effects on the estimation of height of boreal and deciduous forests from interferometric TanDEM-X coherence data

Aire Olesk; Kaupo Voormansik; Tanel Tamm; Mart Noorma; Jaan Praks

doi:10.1117/12.2194340

20 October 2015 Seasonal effects on the estimation of height of boreal and deciduous forests from interferometric TanDEM-X coherence data

Aire Olesk, Kaupo Voormansik, Tanel Tamm, Mart Noorma, Jaan Praks

Author Affiliations +

Proceedings Volume 9644, Earth Resources and Environmental Remote Sensing/GIS Applications VI; 964406 (2015) https://doi.org/10.1117/12.2194340
Event: SPIE Remote Sensing, 2015, Toulouse, France

Abstract

The aim of this study is to assess the performance of single-pass X-band bistatic SAR interferometric forest height estimation of boreal and temperate deciduous forests under variable seasonal conditions. For this, twelve acquisitions of single- and dual-polarized TanDEM-X coherence images over 118 forest stands were analyzed and compared against LiDAR forest height maps. Strong correlations were found between interferometric coherence magnitude and LiDAR derived forest stand height for pine forests (r²=0.94) and spruce forest (r²=0.87) as well as for deciduous trees (r²=0.94) during leaf-off conditions with temperatures below 0°C. It was found that coherence magnitude based forest height estimation is influenced by leaf-on and leaf-off conditions as well as daily temperature fluctuations, height of ambiguity and effective baseline. These factors alter the correlation and should be taken into account for accurate coherence-based height retrieval. Despite the influence of the mentioned factors, generally a strong relationship in regression analysis between X-band SAR coherence and LiDAR derived forest stand height can be found. Moreover, a simple semi empirical model, derived from Random Volume over Ground model, is presented. The model takes into account all imaging geometry dependent parameters and allows to derive tree height estimate without a priori knowledge. Our results show that X-band SAR interferometry can be used to estimate forest canopy height for boreal and deciduous forests in both summer and winter, but the conditions should be stable.

Citation Download Citation

Aire Olesk, Kaupo Voormansik, Tanel Tamm, Mart Noorma, and Jaan Praks "Seasonal effects on the estimation of height of boreal and deciduous forests from interferometric TanDEM-X coherence data", Proc. SPIE 9644, Earth Resources and Environmental Remote Sensing/GIS Applications VI, 964406 (20 October 2015); https://doi.org/10.1117/12.2194340

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