In-flight absolute calibration of an airborne wide-view multispectral imager using a reflectance-based method and its validation

Autor:	Lei Yan, Xiaoxiong Xiong, Yini Duan, Xin Jing, Wei Chen, Zhanqing Li
Rok vydání:	2012
Předmět:	business.industry Multispectral image Hyperspectral imaging Reflectivity Absolute calibration Calibration Data analysis General Earth and Planetary Sciences Environmental science Computer vision Digital number Artificial intelligence business Radiometric calibration Remote sensing
Zdroj:	International Journal of Remote Sensing. 34:1995-2005
ISSN:	1366-5901 0143-1161
DOI:	10.1080/01431161.2012.730160
Popis:	The wide-view multispectral imager WVMI is the main instrument carried on an unmanned vehicle in the Unmanned Vehicle Payloads Comprehensive Calibration Campaign, which focuses on the calibration and validation of various remote-sensing sensors, including multispectral and hyperspectral sensors. In order to calibrate the WVMI, we designed and deployed a set of six radiometric calibration targets with nominal reflectances of 4%, 20%, 30%, 40%, 50%, and 60% and a set of four radiometric validation targets, the reflectance spectra of which vary dramatically with wavelength. The results reveal a good linear relationship between the digital number DN of each sensor and the apparent radiances. Further analysis of data from the validation targets reveals that both spectral unevenness and low reflectance will lead to incurrence of errors in calculations using the calibration equation. This suggests a potential problem that needs to be addressed in the remote sensing of vegetation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9c7fe023d22b447652b8707a927e9f5c https://doi.org/10.1080/01431161.2012.730160 Zobrazit plný text záznamu