Abstract :
A round robin test for GLI (Global Imager) instrument was conducted with the three transfer spectrometers, 400–800 nm, 500–1000 nm and 1300–2500 nm of the wavelength coverages, respectively. Also influence due to water vapor content in the integrating sphere of interest, in particular, at around 1400 nm of water vapor absorption band is evaluated. Using MODTRAN 3.7, it is found that the influence is approximately 40 % for the relative humidity of 50 %. The absolute calibration accuracy of the integrating sphere was verified through a comparison of the radiance from the integrating sphere and the measured radiance with the transfer spectrometers. It is found that the difference between both shows around 1.5 % for vibible to near infrared bands while approximately 2.5 % for shortwave infrared bands.
