Sky camera geometric calibration using solar observations

Urquhart, Bryan; Kurtz, Ben; Kleissl, Jan

doi:https://doi.org/10.5194/amt-9-4279-2016

Articles | Volume 9, issue 9

https://doi.org/10.5194/amt-9-4279-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/amt-9-4279-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 9, issue 9

Research article

|

05 Sep 2016

Research article |

| 05 Sep 2016

Sky camera geometric calibration using solar observations

Bryan Urquhart, Ben Kurtz, and Jan Kleissl

Data sets

Sky imagery data UCSD Sky Imager Cloud Position Study https://www.arm.gov/campaigns/sgp2013sicps

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.