Low uncertainty measurements of bidirectional reflectance factor on the NPOESS/VIIRS solar diffuser

被引：8

作者：

Lessel, Kristen ^{[1
]}

McClain, Stephen ^{[2
]}

机构：

[1] Las Cumbres Observ Global Telescope Network, Goleta, CA USA

[2] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA

来源：

EARTH OBSERVING SYSTEMS XII | 2007年 / 6677卷

关键词：

D O I：

10.1117/12.753243

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

An illuminated Solar Diffuser is the calibration source for the VIS/NIR bands on the NPOESS/VIIRS sensor. We completed a set of BRF measurements to fully characterize the distribution of scattered light from the solar diffuser. NPOESS/VIIRS has an overall VIS/NIR radiometric calibration uncertainty requirement of 2%(1 sigma), of which 1.32% was allocated to the characterization of the BRF. In order to meet this requirement, we modified the existing goniometer and measurement procedure used on MODIS. Modifications include sample yoke redesign, periodic measurements of the lamp polarization coupled with stability measurements, modifications to source optics, and stray light reduction. We measured BRF in 6 spectral wavebands for 9 out-of-plane illumination angles and 2 view angles. We achieved NIST traceable measurements with an uncertainty ranging from 1.09% to 1.32%. Our measurements of a smaller Spectral on (TM), sample match NIST measurements of the same sample to better than 0.5%. These requirements are nominally the same as achieved on MODIS. As a result of instrument upgrades, we currently meet this overall uncertainty while having included additional uncertainty terms.

引用

页数：15