Laboratory spectroscopy calibration procedures. Manual:001. Version:1.8

[摘要] The calibration and validation of earth observation satellite data using high quality, surface based measurements is a critical scientific activity for Australia and CSIRO. A number of vicarious calibration sites have been established in Australia to accurately determine and validate radiometric calibrations, which are used to convert digital data from optical earth observation satellites to radiance. Therefore, it is critical to have systems and procedures in place that can monitor and calibrate the instruments used to acquire ground based radiometric data. To serve this purpose and to ensure measurements obtained over different sites are comparable, sister National Calibration and Validation facilities are being established in Canberraand Perth to service both sides of the continent by providing reliable instrument calibration.This report entails the outcomes of Phase I of the development of these facilities.To quantify the uncertainty of optical instruments used to validate satellite data, NIST1 traceable sources (Integrating sphere as a radiance source and FEL la mp as an irradia nce source) have been employed at both facilities for radiometric calibration. Wavelength standards have also been purchased to achieve reliable wavelength calibration.This report gives an overview of the protocols established for using these standards as a method of conducting routine quality assurance and calibration of spectroradiometers and reflectance panels, used inthe field for vicarious calibration and validation. These protocols are based on the guidelines provided by the Field Spectroscopy Facility (FSF) of the Natural Environmental Research Council (NERC) in the UK. Prior to establishing these protocols, training and certification in spectroradiometric measurement and calibration techniques was also acquired from NIST1. Another key outcome of these facilities has been their application in the calibration and quality control of a hyperspectral radiometer that is currently deployed at the OzFlux Tumbarumba site. Ozflux is part of a global network of micrometeorological flux stations designed to provide continuous, long-term micrometeorological measurements to monitor the state ofecosystems globally. Thus in Phase I, the National Calibration and Validation Facilities are providing calibration and quality control services to benefit national and international collaborations.Phase II will incorporate establishing methods to rigorously determine uncertainty budgets for these calibrations and ensuring that standards at each facility are benchmarked against each other. The protocols will also be extended to a larger suite of optical instruments.

[发布日期] 2014-09-16 [发布机构] CSIRO

[学科分类] 地球科学(综合)