Brief communication: Glacier mapping and change estimation using very high-resolution declassified Hexagon KH-9 panoramic stereo imagery (1971–1984)

International audience The panoramic cameras (PCs) on board Hexagon KH-9 (KH-9PC) satellite missions from 1971-1984 captured very high-resolution stereo imagery with up to 60 cm spatial resolution. This study explores the potential of this imagery for glacier mapping and change estimation. We assess...

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Bibliographic Details
Published in:The Cryosphere
Main Authors: Ghuffar, Sajid, King, Owen, Guillet, Grégoire, Rupnik, Ewelina, Bolch, Tobias
Other Authors: University of Saint Andrews, Laboratoire sciences et technologies de l'information géographique (LaSTIG), Ecole des Ingénieurs de la Ville de Paris (EIVP)-École nationale des sciences géographiques (ENSG), Institut National de l'Information Géographique et Forestière IGN (IGN)-Université Gustave Eiffel-Institut National de l'Information Géographique et Forestière IGN (IGN)-Université Gustave Eiffel
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2023
Subjects:
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV]
The Cryosphere
Online Access:https://hal.science/hal-04205469
https://hal.science/hal-04205469/document
https://hal.science/hal-04205469/file/tc-17-1299-2023.pdf
https://doi.org/10.5194/tc-17-1299-2023
Description
Summary:International audience The panoramic cameras (PCs) on board Hexagon KH-9 (KH-9PC) satellite missions from 1971-1984 captured very high-resolution stereo imagery with up to 60 cm spatial resolution. This study explores the potential of this imagery for glacier mapping and change estimation. We assess KH-9PC imagery using data from the KH-9 mapping camera (KH-9MC), KH-4PC, and SPOT and Pléiades satellite imagery. The high resolution of KH-9PC leads to higher-quality DEMs, which better resolve the accumulation region of the glaciers in comparison to the KH-9MC. On stable terrain, KH-9PC DEMs achieve an elevation accuracy of < 4 m with respect to SPOT and Pléiades DEMs. While the estimated geodetic mass balances using PC and MC data are similar after outlier filtering, the elevation change data show superior spatial coverage and considerably less noise when using KH-9PC data.

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