Reflectance calibration of aerial video imagery with automatic gain compensation on and off
作者:
A. J. RICHARDSON,
J. H. EVERITT,
D. E. ESCOBAR,
期刊:
International Journal of Remote Sensing
(Taylor Available online 1993)
卷期:
Volume 14,
issue 15
页码: 2791-2801
ISSN:0143-1161
年代: 1993
DOI:10.1080/01431169308904309
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Video imaging systems are noi radiometrically calibrated, thus it is difficult to obtain quantitative remotely-sensed imagery for natural resource applications. Video camera automatic gain controls (AGC) present potential problems in calibrating video systems for quantitative analysis because they compensate for changing solar illumination conditions. In this experiment aerial video calibrations to ground reflectance standards were compared for AGC turned on and off, The calibrated aerial video was evaluated for guinea grass (Panicum maximum L.) biomass treatments on two dates. Results showed that there was more atmospheric light scattering in the red than in the NIR video band. Light scattering affects could be detected only when the AGC was ofT because when AGC was on light scattering affects were masked. These results also showed that video imagery produced significant correlations with guinea grass biomass that were comparable to ground reflectance measurements.
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