Articles | Volume 9, issue 9
Atmos. Meas. Tech., 9, 4279–4294, 2016
https://doi.org/10.5194/amt-9-4279-2016
Atmos. Meas. Tech., 9, 4279–4294, 2016
https://doi.org/10.5194/amt-9-4279-2016
Research article
05 Sep 2016
Research article | 05 Sep 2016

Sky camera geometric calibration using solar observations

Bryan Urquhart et al.

Related authors

Development of a sky imaging system for short-term solar power forecasting
B. Urquhart, B. Kurtz, E. Dahlin, M. Ghonima, J. E. Shields, and J. Kleissl
Atmos. Meas. Tech., 8, 875–890, https://doi.org/10.5194/amt-8-875-2015,https://doi.org/10.5194/amt-8-875-2015, 2015

Related subject area

Subject: Clouds | Technique: Remote Sensing | Topic: Instruments and Platforms
VELOX – a new thermal infrared imager for airborne remote sensing of cloud and surface properties
Michael Schäfer, Kevin Wolf, André Ehrlich, Christoph Hallbauer, Evelyn Jäkel, Friedhelm Jansen, Anna Elizabeth Luebke, Joshua Müller, Jakob Thoböll, Timo Röschenthaler, Bjorn Stevens, and Manfred Wendisch
Atmos. Meas. Tech., 15, 1491–1509, https://doi.org/10.5194/amt-15-1491-2022,https://doi.org/10.5194/amt-15-1491-2022, 2022
Short summary
Above-aircraft cirrus cloud and aerosol optical depth from hyperspectral irradiances measured by a total-diffuse radiometer
Matthew S. Norgren, John Wood, K. Sebastian Schmidt, Bastiaan van Diedenhoven, Snorre A. Stamnes, Luke D. Ziemba, Ewan C. Crosbie, Michael A. Shook, A. Scott Kittelman, Samuel E. LeBlanc, Stephen Broccardo, Steffen Freitag, and Jeffrey S. Reid
Atmos. Meas. Tech., 15, 1373–1394, https://doi.org/10.5194/amt-15-1373-2022,https://doi.org/10.5194/amt-15-1373-2022, 2022
Short summary
Impact of second-trip echoes for space-borne high-pulse-repetition-frequency nadir-looking W-band cloud radars
Alessandro Battaglia
Atmos. Meas. Tech., 14, 7809–7820, https://doi.org/10.5194/amt-14-7809-2021,https://doi.org/10.5194/amt-14-7809-2021, 2021
Short summary
Spaceborne differential absorption radar water vapor retrieval capabilities in tropical and subtropical boundary layer cloud regimes
Richard J. Roy, Matthew Lebsock, and Marcin J. Kurowski
Atmos. Meas. Tech., 14, 6443–6468, https://doi.org/10.5194/amt-14-6443-2021,https://doi.org/10.5194/amt-14-6443-2021, 2021
Short summary
Multifrequency radar observations of clouds and precipitation including the G-band
Katia Lamer, Mariko Oue, Alessandro Battaglia, Richard J. Roy, Ken B. Cooper, Ranvir Dhillon, and Pavlos Kollias
Atmos. Meas. Tech., 14, 3615–3629, https://doi.org/10.5194/amt-14-3615-2021,https://doi.org/10.5194/amt-14-3615-2021, 2021
Short summary

Cited articles

Bacher, P., Madsen, H., and Nielsen, H. A.: Online short-term solar power forecasting, Sol. Energy, 83, 1772–1783, https://doi.org/10.1016/j.solener.2009.05.016, 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, https://doi.org/10.1016/j.solener.2011.08.025, 2011.
Download
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.