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NCAVEO: Multi-angle sky spectra collected using a sky irradiance scanner

Update Frequency: Not Planned
Latest Data Update: 2008-10-08
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2008-10-07
Download Stats: last 12 months
Dataset Size: 200 Files | 36MB


This dataset compromises measurements of the angular distribution of spectral sky radiance (400-1000nm), collected as part of the Network for Calibration and Validation of Earth Observation (NCAVEO) 2006 Field Campaign. Measurements were taken at frequent intervals on the 17th June 2006 using a new instrument designed by Andrew McGonigle. The instrument is based on a temperature-stabilised miniature spectroradiometer interfaced to a telescope that can be programmed to make zenithal scans of sky irradiance. Azimuthal motion of the whole instrument was provided by manual adjustment. A sampling interval of 18° in zenith and 30° in azimuth was used. All data were collected when the spectrometer was thermally stabilised to the same temperature (approximately 7.5°C).

Each sample of the sky irradiance distribution comprised two scans: one of the whole sky, and then a
second low-gain scan shortly afterwards, concentrating just on the region around the Sun. Scans were repeated twice, with different integration times to allow for the extreme differences in brightness of the Sun and the sky. For further information and details on the structure of the files see the dataset's metadata PDF in linked documentation.

Citable as:  Network for Calibration and Validation of EO data (2008): NCAVEO: Multi-angle sky spectra collected using a sky irradiance scanner. NERC Earth Observation Data Centre, date of citation.
Abbreviation: Not defined


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Access rules:
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Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

These data were provided to NEODC by university of Southampton, who carried out work to convert formats to NASA-Ames, and write metadata documents. The metadata documents describing the processing are archived alongside the data as PDF files.

Data Quality:
Mostly unknown, but some quality statements are provided in metadata files archived alongside the data.
File Format:
Images are in HDR format

Related Documents

 Metadata PDF

Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Instrument/Platform pairings

sky irradiance scanner Deployed on: Chilbolton Atmospheric Observatory (CAO)
Output Description


No variables found.

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Geographic Extent