Hyperspectral field spectrometry of Arctic vegetation units in the central Lena Delta

• Main Authors: Runge, Alexandra, Fuchs, Matthias, Shevtsova, Iuliia, Landgraf, Nele, Heim, Birgit, Herzschuh, Ulrike, Grosse, Guido
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: AWI_Envi; AWI_Perma; Carbon in Permafrost / Kohlenstoff im Permafrost; field spectrometry; hyperspectral; KoPF; Kurungnakh; Permafrost Research; Polar Terrestrial Environmental Systems @ AWI; Samoylov; spectral evolution; Vegetation; Arctic; Alfred Wegener Institute; lena delta; permafrost
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.945982; https://doi.org/10.1594/PANGAEA.945982

Hyperspectral field measurements were acquired in the central Lena Delta in August 2018. The aim was to conduct spectral surface reflectance surveys of various homogeneous vegetation areas on different permafrost landforms to establish a representative spectral reflectance database. In total, we took 28 hyperspectral field measurements of 30 m x 30 m homogeneous vegetation plots across Samoylov and Kurungnakh-Island. Four plots were measured twice with a two-week delay, therefore depicting the changes on reflectance signature. We conducted the field-spectrometry measurements with the Spectral Evolution SR-2500 with a 1.5 m Fiber Optic Cable. The instrument is calibrated to a spectral radiance range of 350 to 2.500 nm. Further technical details are provided in a separate document. We identified homogeneous vegetation plots with a size of 30 m x 30 m and acquired about 100 individual spectrometry measurements, randomly scattered across the plot. At the start and at the end of each survey the system was referenced by measuring the back reflected radiance from a Zenith Lite^TM Diffuse Reflectance Target of 50% reflectivity. Hyperspectral field measurements with the plot name SAM18 were taken on Samoylov and those with KUR18 on Kurungnakh-Island. All data was collected by scientists from the Alfred Wegener Institute (AWI) Helmholtz Centre for Polar and Marine Research and University of Potsdam, Germany.