Dr. Ling Wang Profile

Dr. Ling Wang

at China Meteorological Administration

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Publications (3)

Proceedings Article | 29 September 2017 Paper

Assessment of BRDF effect of Kunlun Mountain glacier on Tibetan Plateau as a potential pseudo-invariant calibration site

Ling Wang, Xiuqing Hu, Lin Chen

Proceedings Volume 10423, 1042320 (2017) https://doi.org/10.1117/12.2278203

KEYWORDS: Bidirectional reflectance transmission function, Calibration, Reflectivity, MODIS, Data modeling, Photonic integrated circuits, Sensors, Atmospheric monitoring, Sensor calibration, Remote sensing

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Calibration is a critical step to ensure data quality and to meet the requirement of quantitative remote sensing in a broad range of scientific applications. One of the least expensive and increasingly popular methods of on-orbit calibration is the use of pseudo invariant calibration sites (PICS). A spatial homogenous and temporally stable area of 34 km2 in size around the center of Kunlun Mountain (KLM) over Tibetan Plateau (TP) was identified by our previous study. The spatial and temporal coefficient of variation (CV) this region was better than 4% for the reflective solar bands. In this study, the BRDF impacts of KLM glacier on MODIS observed TOA reflectance in band 1 (659 nm) are examined. The BRDF impact of KLM glacier with respect to the view zenith angle is studied through using the observations at a fixed solar zenith angle, and the effect with respect to the sun zenith angle is studied based on the observations collected at the same view angle. Then, the two widely used BRDF models are applied to our test data to simulate the variations of TOA reflectance due to the changes in viewing geometry. The first one is Ross-Li model, which has been used to produce the MODIS global BRDF albedo data product. The second one is snow surface BRDF model, which has been used to characterize the bidirectional reflectance of Antarctic snow. Finally, the accuracy and effectiveness of these two different BRDF models are tested through comparing the model of simulated TOA reflectance with the observed one. The results show that variations of the reflectances at a fixed solar zenith angle are close to the lambertian pattern, while those at a fixed sensor zenith angle are strongly anisotropic. A decrease in solar zenith angle from 50º to 20º causes an increase in reflectance by the level of approximated 50%. The snow surface BRDF model performs much better than the Ross-Li BRDF model to re-produce the Bi-Directional Reflectance of KLM glacier. The RMSE of snow surface BRDF model is 3.60%, which is only half of the RMSE when using Ross-Li model.

Proceedings Article | 26 November 2014 Paper

Performance assessment of FY-3C/MERSI on early orbit

Xiuqing Hu, Na Xu, Ronghua Wu, Lin Chen, Min Min, Ling Wang, Hanlie Xu, Ling Sun, Zhongdong Yang, Peng Zhang

Proceedings Volume 9264, 92640Y (2014) https://doi.org/10.1117/12.2071190

KEYWORDS: Calibration, Reflectivity, Signal to noise ratio, Modulation transfer functions, Sensors, Mirrors, MODIS, Satellites, Interference (communication), Image resolution

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Proceedings Article | 19 November 2014 Paper

Detecting the radiometric changes of FY-3A/MERSI reflective solar bands by use of stable desert sites

Ling Wang, Lin Chen, Xiuqing Hu

Proceedings Volume 9264, 92640W (2014) https://doi.org/10.1117/12.2069065

KEYWORDS: Reflectivity, Bidirectional reflectance transmission function, Calibration, Sensors, Satellites, Scattering, Image resolution, Spectral resolution, Clouds, Sensor performance

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