One method to assess the radiometric calibration is the reflectance-based approach, a common technique used for several other earth science sensors covering similar spectral regions. Also, comprehensive and long-term ecological studies require these data to be comparable over time, between coexisting sensors and between generations of follow-on sensors. Data gathered with this instrument needs to be quantitative and accurate in order to derive meaningful information about ecosystem properties and processes. The Hyperion imaging spectrometer on the Earth Observing- 1 satellite is the first high-spatial resolution imaging spectrometer to routinely acquire science-grade data from orbit. Consequently, the Libya 4, Mauritania 2, and Libya 1 CEOS selected PICS are spectrally stable targets within the time and spatial swath ranges of the Hyperion collections. Time and ROI location-dependent SAM and AD results are very stable within +/- 2 deg and +/- 1.7% of 1sigma standard deviations. Based on the reference ROI spectrum, the spectral stability of these ROIs is evaluated by average deviations (ADs) and spectral angle mapper (SAM) methods in the specific ranges of time and geo-spatial locations. A series of ROIs are predefined in the along-track direction with 196 spectral top-of-atmosphere reflectance values in each ROI. In each site, a reference spectrum is selected at a specific day in the vicinity of the region of interest (ROI) defined by Committee on Earth Observation Satellites (CEOS). All the available Hyperion collections, downloaded from the Earth Explorer website, were utilized for the three PICS. The objective of this paper is to formulate a methodology to assess the spectral stability of the Libya 4, Libya 1, and Mauritania 2 pseudo-invariant calibration sites (PICS) using Earth Observing One (EO- 1) Hyperion sensor. Assessment of the Spectral Stability of Libya 4, Libya 1, and Mauritania 2 Sites Using Earth Observing One HyperionĬhoi, Taeyoung Xiong, Xiaoxiong Angal, Amit Chander, Gyanesh Qu, John J.
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