ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume V-1-2022
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., V-1-2022, 195–202, 2022
https://doi.org/10.5194/isprs-annals-V-1-2022-195-2022
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., V-1-2022, 195–202, 2022
https://doi.org/10.5194/isprs-annals-V-1-2022-195-2022
 
17 May 2022
17 May 2022

CALIBRATION OF A LIGHT HEMISPHERICAL RADIANCE FIELD IMAGING SYSTEM

M. Lei, C. Thom, C. Meynard, and J.-M. Muller M. Lei et al.
  • LASTIG, Univ Gustave Eiffel, ENSG, IGN, F-94160 Saint-Mande, France

Keywords: Hemispherical Radiance, Fish-eye Camera, Sensor Modelling, Radiometric Calibration

Abstract. A light hemispherical radiance field imaging system based on fish-eye camera was developed for the measurement of the surface incident radiance in an urban environment, which is often affected by radiometric heterogeneity problems. A linear radiometric model and a polynomial fish-eye lens model are used. A temperature-dependent dark level model is proposed to improve the dark correction for high dynamic range photography. This paper describes the calibration procedure for spectral and geometrical radiance field measurements and presents the results of the calibration. The spectral radiometric calibration error is 2.07%, 1.34%, and 0.98% for blue, green, and red bands, respectively. The mean geometrical calibration error is 2.037 pixels.