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Discussion papers
https://doi.org/10.5194/essd-2019-88
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-88
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: data description paper 14 Aug 2019

Submitted as: data description paper | 14 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

Laboratory, field, mast-borne and airborne spectral reflectance measurements of boreal landscape during spring

Henna-Reetta Hannula1, Kirsikka Heinilä2, Kristin Böttcher2, Olli-Pekka Mattila3, Miia Salminen1, and Jouni Pulliainen1 Henna-Reetta Hannula et al.
  • 1Space and Earth Observation Centre, Finnish Meteorological Institute, Helsinki, 00560, Finland
  • 2Geoinformatics Research, Finnish Environment Institute, Helsinki, 00790, Finland
  • 3Program for Environmental Information, Finnish Environment Institute, Helsinki, 00790, Finland

Abstract. We publish and describe a surface spectral reflectance data record of seasonal snow (dry, wet, shadowed), forest ground (lichen, moss) and forest canopy (spruce and pine, branches) constituting the main elements of the boreal landscape. The reflectances are measured with spectro(radio)meters covering the wavelengths from visible (VIS) to short-wave infrared (SWIR) (350 to 2500 nm). In this paper, we describe the instruments used and how the spectral observations at different scales along with the concurrent in situ reference data have been collected, processed and archived. Information on the quality of the data and factors causing uncertainty are discussed. The main experimental site is located in Sodankylä Arctic Space Centre in northern Finland (67.37° N, 26.63° E) and the surrounding region. The collection includes highly controlled snow and conifer branch laboratory spectral measurements, portable field spectroradiometer observations of snow and snow-free ground at different locations and continuous mast-borne reflectance time series data of a pine forest and forest opening. In addition to the surface level spectral reflectance, data from airborne imaging spectrometer campaigns over Sodankylä boreal forest and Saariselkä fell region at selected spectral bands are included in the collection. All measurements of the data record correspond to a typical polar orbiting satellite observation event in high latitude spring season regarding their sun or illumination source (calibrated lamp) zenith angle and close to nadir instrument viewing angle. For all measurement geometries, observations are given in surface reflectance quantity corresponding to the typical representation of a satellite observation quantity to facilitate their comparison with other data sources. The openly accessible spectral reflectance data at multiple scales are suitable e.g. to climate and hydrological research and remote sensing model validation and development. To facilitate easy access to the data record the four datasets described here are deposited in a permanent data repository (http://www.zenodo.org/communities/boreal_reflectances/) (Hannula et al., 2019). Each dataset of a distinct scale has its own unique DOI (laboratory: https://doi.org/10.5281/zenodo.2677477, field: https://doi.org/10.5281/zenodo.2653629, mast-borne: https://doi.org/10.5281/zenodo.3349747, airborne: https://doi.org/10.5281/zenodo.3048420, https://doi.org/10.5281/zenodo.3048902).

Henna-Reetta Hannula et al.
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Henna-Reetta Hannula et al.
Data sets

Laboratory spectral reflectance measurements of pine/spruce twigs and snow H.-R. Hannula and K. Heinilä https://doi.org/10.5281/zenodo.2677477

Spectrometer measurements of snow and bare ground targets and simultaneous measurements of snow conditions K. Heinilä, K. Böttcher, and O.-P. Mattila https://doi.org/10.5281/zenodo.2653629

Mast-borne spectral reflectance measurements of boreal landscape during spring H.-R. Hannula and K. Heinilä https://doi.org/10.5281/zenodo.3349747

Airborne Spectrometer Measurements from Boreal Snow-Covered Landscape K. Heinilä https://doi.org/10.5281/zenodo.3048420

Airborne Spectrometer Measurements from Boreal and Tundra Site During Spring Snow Melt K. Heinilä https://doi.org/10.5281/zenodo.3048902

Henna-Reetta Hannula et al.
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Short summary
We publish and describe a surface spectral reflectance data record of seasonal snow (dry, wet, shadowed), forest ground (lichen, moss) and forest canopy (spruce and pine, branches) constituting the main elements of the boreal landscape. The data record describes the characteristics and variability of the satellite scene reflectance contributors in boreal landscape thus enabling development of improved optical satellite snow mapping methods for forested areas.
We publish and describe a surface spectral reflectance data record of seasonal snow (dry, wet,...
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