Toward Landsat and Sentinel-2 BRDF Normalization and Albedo Estimation: A Case Study in the Peruvian Amazon Forest

Franch Gras, Belen ; Vermote, Eric ; Skakun, Sergii ; Roger, Jean-Claude ; Santamaria Artigas, Andres E ; Villaescusa Nadal, Jose Luis ; Masek, Jeffery G

关键词: LANDSAT SATELLITES;    SENTINEL SYSTEM;    ALBEDO;    AMAZON REGION (SOUTH AMERICA);    DISTRIBUTION FUNCTIONS;    IMAGING SPECTROMETERS;    MEASURING INSTRUMENTS;    MODIS (RADIOMETRY);    NEAR INFRARED RADIATION;    TIME SERIES ANALYSIS;    SPECTRAL REFLECTANCE;    SURFACE PROPERTIES;    ERRORS;    FORESTS;   

RP-ID  :  GSFC-E-DAA-TN65630

学科分类：地球科学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The Amazon forest has been the focus of study by the science community during the last few decades. Remote sensing data analysis is the only way to study such a large geographical extent during an extended period of time. Since the launch in 2015 of Sentinel 2 and its increase in temporal resolution through the combination with Landsat sensors, a strong emphasis has been put on exploiting these data. Though these satellites provide near nadir observations, surface reflectance time series are affected by illumination variability throughout the year. These effects can be corrected using a Bidirectional Reflectance Distribution Function (BRDF) model. Franch et al. (2014a) developed a methodology to derive Landsat surface albedo and BRDF. It is based on the BRDF parameters from the MODerate Resolution Imaging Spectroradiometer (MODIS) which are disaggregated at Landsat spatial resolution (30 m). In this work, we apply the Franch et al. (2014a) method to normalize the surface reflectance for BRDF effects using the NASA's Harmonized Landsat Sentinel-2 (HLS) product. We apply this method to the Tambopata region in Peru from 2013 to 2017 and validate it using ground-based albedometer measurements. The results show that the near infrared reflectance can increase up to 0.06 (20%) for low solar angles while the impact on the red range and the NDVI is minor (<0.01). The evaluation of the surface albedo against field measurements shows an error of 0.01.