Applications using EO-1 hyperion AT-sensor and surface reflectance: comparisons and case studies

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Applications_using_EO-1_hyperion_AT-sensor_and_surface_reflectance_comparisons_and_case_studies.pdf (381.28 KB)

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https://ieeexplore.ieee.org/document/5650409

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https://doi.org/10.1109/IGARSS.2010.5650409
 http://hdl.handle.net/11603/28640

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UMBC Joint Center for Earth Systems Technology (JCET)
UMBC Faculty Collection
UMBC Geography and Environmental Systems Department
UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0003-4148-9108
 https://orcid.org/0000-0003-0823-308X
 https://orcid.org/0000-0002-0505-4951

Date

2010-12-03

Type of Work

conference papers and proceedings
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Citation of Original Publication

Y. -B. Cheng, E. M. Middleton, Q. Zhang, S. Ungar and P. K. E. Campbell, "Applications using EO-1 hyperion AT-sensor and surface reflectance: comparisons and case studies," 2010 IEEE International Geoscience and Remote Sensing Symposium, Honolulu, HI, USA, 2010, pp. 2248-2251, doi: 10.1109/IGARSS.2010.5650409.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

The NASA EO-1 Hyperion observations were utilized to derive at-sensor Top-of-atmosphere (TOA) and ATREM-corrected surface reflectance over three study sites of different land use types. Direct comparisons between TOA and ATREM reflectance showed the most disagreement in the visible spectral region and regions that were affected by water absorption features. Nevertheless, as little as 3% overall differences were found for an arid dessert scene. Furthermore, example applications using Hyperion at-sensor TOA reflectance were investigated. Selected band ratio vegetation indices calculated from both TOA and surface reflectance were correlated (r~0.6 to 0.94) but differed in magnitude. For instance, NDVI calculated from at-sensor TOA reflectance consistently showed lower values. A potential quick-look product using these indices to model relative vegetation stress was demonstrated in this study.