Initial Sample of HYPERNETS Hyperspectral Surface Reflectance Measurements for Satellite Validation from the Wytham Woods site in the United Kingdom
- 1. National Physical Laboratory
Description
The HYPERNETS project (www.hypernets.eu) has the overall aim to ensure that high quality in situ measurements are available to support the (VNIR/SWIR) optical Copernicus products. Therefore, it established a new autonomous hyperspectral spectroradiometer (HYPSTAR® - www.hypstar.eu) dedicated to land and water surface reflectance validation with instrument pointing capabilities. In the prototype phase, the instrument is being deployed at 24 sites covering a range of water and land types and a range of climatic and logistic conditions. This dataset provides the first published data for the Wytham Woods HYPERNETS site in the United Kingdom (WWUK). It is a subset of the complete data record which consists of the best quality WWUK measurements which could be used for satellite validation.
The provided NetCDF files are the L2A hypernets products with surface reflectances, their associated uncertainties and error-correlation information. The reflectance in the L2A products is the Hemispherical-directional Reflectance Factor (HDRF) defined as: HDRF = π L / E where L is the directional upwelling radiance (with field of view of 5 degrees) and E is the (hemispherical) downwelling irradiance (i.e. including both direct solar and diffuse sky irradiance). These reflectances have dimensions of wavelength and series, where each series is a set of measurements for a given geometry (combination of viewing zenith and azimuth angle). In addition to variables for wavelength and bandwidth, the files also contain variables that provide for each series the acquisition time, viewing and solar angles, number of valid scans used, and quality flags (typically no flags are set in the data provided in this dataset). These NetCDF files also contain further relevant metadata as attributes. See https://hypernets-processor.readthedocs.io/ for further info.
The WWUK site is a deciduous broadleaf forest comprised primarily of Oak, Hazel, Ash, Sycamore and Beech. It is located approximately 5 km North-West of Oxford, UK and has an extensive history of scientific research. The site follows the typical seasonal dynamics of a temperate forest with distinctive periods of leaf-off, green up and senescence across the growing season. The HYPERNETS site itself (51.777206 degrees N, 1.338494 W), is located at a height of 28 m upon a flux tower in the centre of the forest. The HYPSTAR®-XR sensor was installed in October 2021. Data are collected e very 30 minutes between 9am and 6pm local time between viewing zenith angles of 0 and 30 degrees.
The HYPSTAR®-XR (eXtended Range) instruments deployed at each land HYPERNETS site consist of a VNIR and a SWIR sensor and autonomously collect data between 380-1700 nm at various viewing geometries and send it to a central server for quality control and processing. The VNIR sensor spans 1330 channels between 380 and 1000 nm with a FWHM of 3 nm and the SWIR sensor has 220 channels between 1000 and 1700 nm with a FWHM of 10 nm. The hypernets_processor (Goyens et al. 2021; De Vis et al. in prep.) automatically processes all this data into various products, including the L2A surface reflectance product provided here. All of the products have associated uncertainties (divided into random and systematic uncertainties, including error-correlation information) which were propagated using the CoMet toolkit (www.comet-toolkit.org).
To obtain this dataset, we start from the full WWUK data record and omit all the data that do not pass all of the quality checks performed as part of the hypernets_processor. In addition, two additional screening procedures are developed to remove outliers and only supply the best quality data suitable for satellite validation. For Wytham wood, sequences are only supplied that match a typical vegetation spectrum. As such, data is only provided between April and October during the leaf-on period. Reflectances are then tested against three parameters to check that they are vegetation spectrum. Firstly, that there is a peak in the green portion of the visible wavebands (560 nm). Secondly, that a red edge is detected. Finally, the Normalized Difference Vegetation Index (NDVI) is calculated. Spectra with an NDVI of less than 0.42 are removed from the final data set.
After the vegetation quality flag are applied, a sigma-clipping method is used to remove outliers. First reflectances are extracted in separate 2 hour windows throughout the day (to account for BRDF differences due to different solar position) for 4 different wavelengths (500, 900, 1100 and 1600 nm). Outliers in these reflectances are then identified by iteratively calculating the mean reflectance trend with time (by binning the data per maximum 30 data points), calculating the standard deviation from this trend, and masking any data that is more than 3 standard deviations away from the trend. This process is repeated on the unmasked data until the standard deviation does not vary by more than 5% between two iterations. The masks for the 4 different wavelengths are then combined (keeping only measurements for which none of the 4 wavelengths is an outlier). The reflectances and associated uncertainties for any masked series (i.e. a geometry that is masked either by the sigma-clipping procedure or from the masks of the hypernets_processor) are replaced by NaNs. Any sequence that has more than half of its series masked is removed entirely.
Files
WWUK_sequences.csv
Files
(294.1 MB)
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1.0 MB | Download |
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1.0 MB | Download |
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1.0 MB | Download |
md5:1517738bf77278f91a1f208efe2d85a1
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1.0 MB | Download |
md5:cbf36910282f09eced683bd933b7b628
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940.4 kB | Download |
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1.0 MB | Download |
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1.0 MB | Download |
md5:b655f9d0b73b3c425757d8f030388781
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989.3 kB | Download |
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1.0 MB | Download |
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892.8 kB | Download |
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999.6 kB | Download |
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953.2 kB | Download |
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987.7 kB | Download |
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1.0 MB | Download |
md5:d616a7f51a9191192977144ce07a4e27
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947.4 kB | Download |
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956.6 kB | Download |
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1.0 MB | Download |
md5:d8a1d2401afbe7eb483001817c0790eb
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890.8 kB | Download |
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1.0 MB | Download |
md5:10b75908ffae2e95728d5690974732d7
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928.6 kB | Download |
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889.5 kB | Download |
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959.8 kB | Download |
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1.0 MB | Download |
md5:894983101ea44f7f255025bbcfba7f43
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879.8 kB | Download |
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980.9 kB | Download |
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879.3 kB | Download |
md5:a03caa49679fa4ec8d405640cdedb306
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833.6 kB | Download |
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md5:9e8500f9c4621a53cb21eface709298f
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953.5 kB | Download |
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878.3 kB | Download |
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921.8 kB | Download |
md5:932b5e4328136ca50e561149f1ab727c
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871.1 kB | Download |
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912.7 kB | Download |
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937.8 kB | Download |
md5:cc4176f48db4f65beebb6b7b8dc40ac1
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1.0 MB | Download |
md5:4cf1b259809438018e02a99289a328ca
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920.8 kB | Download |
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1.0 MB | Download |
md5:dc76e39a868053420f6a72ee46321615
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910.8 kB | Download |
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925.0 kB | Download |
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1.0 MB | Download |
md5:3181542c32a1ab3ec50c37a3bc97ae7b
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992.1 kB | Download |
md5:84e5b8eec91d014c699e061cae0e1998
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970.5 kB | Download |
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md5:46989115c53be5b13468eaf1b68ae55a
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884.2 kB | Download |
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md5:46a9a9cbe35e9fa16fd39b3f8e0e6a31
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897.1 kB | Download |
md5:b2be5018743658aa47f5b26e72895ea2
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31.7 kB | Preview Download |