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Carlsen, Tim; Birnbaum, Gerit; Ehrlich, André; Helm, Veit; Jäkel, Evelyn; Schäfer, Michael; Wendisch, Manfred (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14. PANGAEA, https://doi.org/10.1594/PANGAEA.921707

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Abstract:
The hemispherical-directional reflectance factor (HDRF) of snow surfaces was measured in Antarctica during austral summer in 2013/14. The HDRF was retrieved from airborne measurements using a digital 180° fish-eye camera onboard the research aircraft Polar 6 operated by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, Germany.
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The dataset contains the weighting functions for isotropic (f_iso), volumetric (f_vol), and geometric (f_geo) scattering obtained by inverting the kernel-driven, semi-empirical Ross-Thick-Li-Sparse-Reciprocal model for the bidirectional reflectance distribution function (BRDF). Along with the weighting functions f_iso, f_vol, and f_geo, the weights of determination (WoD) and root-mean-square errors (RMSE) are given as a criterion for the quality of the inversion for all 3 camera channels (Red: 602 nm central wavelength, Green: 538 nm, Blue: 470 nm). In addition, the footprint size of the camera observations is stated.
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The snow HDRF was measured over a variety of different solar zenith angles, optical-equivalent snow grain sizes, and surface roughness, which are given as parameters within the dataset. The optical-equivalent snow grain size was retrieved from spectral surface albedo measurements with the Spectral Modular Airborne Radiation measurement sysTem (SMART) mounted on Polar 6 using observations at 1280 and 1100 nm wavelength. The surface roughness was measured using the airborne laser scanner RIEGL VQ580 on Polar 6.
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Averaging was performed over time intervals of 30 s. The number of camera pictures, SSA measurements and laser scanner observations used for averaging over each 30s-interval are given.
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The dataset further includes basic flight parameters such as the second of day, longitude, latitude, flight altitude, surface elevation, aircraft velocity, and an attitude flag (0 = okay, 1 = do not use) corresponding to the times of measurement.
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Use of these data requires prior OK from the PIs.
Keyword(s):
anisotropy; BRDF; camera observations; HDRF; reflectance; remote sensing; snow; snow grain size; snow surface roughness
Related to:
Carlsen, Tim; Birnbaum, Gerit; Ehrlich, André; Helm, Veit; Jäkel, Evelyn; Schäfer, Michael; Wendisch, Manfred (2020): Parameterizing anisotropic reflectance of snow surfaces from airborne digital camera observations in Antarctica. The Cryosphere, 14(11), 3959-3978, https://doi.org/10.5194/tc-14-3959-2020
Coverage:
Median Latitude: -74.870605 * Median Longitude: -1.405499 * South-bound Latitude: -80.746110 * West-bound Longitude: -26.205910 * North-bound Latitude: -70.295792 * East-bound Longitude: 25.149455
Date/Time Start: 2013-12-27T00:00:00 * Date/Time End: 2014-01-05T15:20:00
Size:
13 datasets

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Datasets listed in this publication series

  1. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312272702). https://doi.org/10.1594/PANGAEA.921695
  2. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312282802). https://doi.org/10.1594/PANGAEA.921696
  3. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312282902). https://doi.org/10.1594/PANGAEA.921697
  4. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312283001). https://doi.org/10.1594/PANGAEA.921698
  5. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312283101). https://doi.org/10.1594/PANGAEA.921699
  6. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312283201). https://doi.org/10.1594/PANGAEA.921700
  7. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312293301). https://doi.org/10.1594/PANGAEA.921701
  8. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1312313502). https://doi.org/10.1594/PANGAEA.921702
  9. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1401023602). https://doi.org/10.1594/PANGAEA.921703
  10. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1401023702). https://doi.org/10.1594/PANGAEA.921704
  11. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1401043902). https://doi.org/10.1594/PANGAEA.921705
  12. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (flight ANT_1401054002). https://doi.org/10.1594/PANGAEA.921706
  13. Carlsen, T; Birnbaum, G; Ehrlich, A et al. (2020): Hemispherical-directional reflectance factor (HDRF) of snow surfaces retrieved from airborne camera measurements in Antarctica during austral summer in 2013/14 (links to files). https://doi.org/10.1594/PANGAEA.920231