Articles | Volume 9, issue 9
Atmos. Meas. Tech., 9, 4279–4294, 2016
Atmos. Meas. Tech., 9, 4279–4294, 2016
Research article
05 Sep 2016
Research article | 05 Sep 2016

Sky camera geometric calibration using solar observations

Bryan Urquhart et al.

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Cited articles

Bacher, P., Madsen, H., and Nielsen, H. A.: Online short-term solar power forecasting, Sol. Energy, 83, 1772–1783,, 2009
Brown, D. C.: An advanced reduction and calibration for photogrammetric cameras, Air Force Missile Test Center Technical Report No. 59–25, Patrick AFB, Florida, 1964.
Brown, D. C.: Decentering distortion of lenses, Photogramm. Eng., 32, 444–462, 1966.
Brown, D. C.: Close-range camera calibration, Photogramm. Eng., 37, 855–866, 1971.
Chow, C. W., Urquhart, B., Lave, M., Dominguez, A., Kleissl, J., Shields, J. E., and Washom, B.: Intra-hour forecasting with a total sky imager at the UC San Diego solar energy testbed, Sol. Energy, 85, 2881–2893,, 2011.
Short summary
A model relating the position of objects in the 3-D world to their pixel coordinates has been developed for a fixed-focal length fisheye lens camera. An associated automated method to calibrate model parameters has been developed for a daytime skyward-pointing camera. The position of the sun throughout the day is used as input to the calibration algorithm. The accuracy of the calibration was found to be on the same order as the accuracy of sun position detection in an image.