Initial assessment of ATRS-2 data for retrieval of forest characteristics

Fraser M. Gemmell; Andrew K. Millington; Jane Wellens; Barry K. Wyatt; France Gerard

doi:10.1117/12.227203

24 November 1995 Initial assessment of ATRS-2 data for retrieval of forest characteristics

Fraser M. Gemmell, Andrew K. Millington, Jane Wellens, Barry K. Wyatt, France Gerard

Proceedings Volume 2585, Remote Sensing for Agriculture, Forestry, and Natural Resources; (1995) https://doi.org/10.1117/12.227203
Event: Satellite Remote Sensing II, 1995, Paris, France

Abstract

Initial assessment of the utility of ATSR-2 1 km data for retrieval of forest characteristics was made. Principal component analysis was applied to an image of a tropical forest site in order to assess the dimensionality of the 14 ATSR-2 features, which include 4 spectral and 3 thermal bands, obtained at 2 view angles. The combined dataset had a 5-dimensional structure. The optimal combination of spectral features for discriminating forest characteristics in this site were the four ATSR-2 nadir channels, plus either the forward red or green channel, which gave a 4-dimensional data structure. Sensitivity analysis of a forest BRDF model was employed to investigate the relationships between nadir and forward samples of the ATSR-2. Simulated relationships between nadir and forward samples, for stands of varying fractional ground cover and crown LAI, indicate weak non-linear relations for all spectral bands. BRDF simulation results indicate that some additional information, not contained in the nadir data, is contained in the forward data. A stochastic scene simulation, coupled with the BRDF model, was used to approximate the data structure of an ATSR-2 image. Results are interpreted in terms of a number of important factors operating in an ATSR-2 scene that may either reduce or enhance BRDF effects in the measured radiance, and thus affect the success of inverse BRDF algorithms. These factors include sensor spatial resolution, scales of variation of surface cover features, and differences in the sampling characteristics between nadir and forward scans. Further testing of ATSR-2 data, including the utility of its spectral bandwidths and its multi-temporal capability, is required for a variety of different forested sites.

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Fraser M. Gemmell, Andrew K. Millington, Jane Wellens, Barry K. Wyatt, and France Gerard "Initial assessment of ATRS-2 data for retrieval of forest characteristics", Proc. SPIE 2585, Remote Sensing for Agriculture, Forestry, and Natural Resources, (24 November 1995); https://doi.org/10.1117/12.227203

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KEYWORDS

Bidirectional reflectance transmission function

Reflectivity

Principal component analysis

Sensors

Short wave infrared radiation

Data modeling

Near infrared

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