International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part BI. Istanbul 2004 
transmittance: the ratio of the incident to transmitted flux. 
Type A = evaluated statistically; Type B = evaluated using 
models or other external information; Type B = one standard 
deviation. 
validation: the process of assessing, by independent means, the 
quantity of the data products derived from the system outputs. 
4. RECOMMENDATIONS 
1. Create a list of Radiometric and Geometric parameters and 
poll the task force members for their additions and deletions; 
2. Working face-to-face or via email reach consensus on the list 
of parameters, prioritize the list, review the range of existing 
definitions, and develop provisional standard definitions, citing 
references; 
3. Work ISO TC211 to translate Task Force definitions into the 
ISO process; 
4. The EO community should consider establishing an MRA- 
like database similar to one created by the National Metrology 
Institutes (NMIs) of EO-specific quantities populated by 
information from the calibration teams around the world about 
their measurement capabilities, but with the quality of the data 
underwritten by formal comparisons/audits from independent 
NMIs; 
5. Engage in a total systems approach to measuring pre-launch 
and post-launch calibration, using best practices, materials and 
equipment; and over time to share and test these technologies 
among sensor designers in a variety of laboratories and Earth 
environments; 
6. In-flight and on-orbit calibration of radiometric and 
geometric parameters would benefit from expanding the global 
distribution of test sites and ranges to include many more of 
Earth's ecosystems. To date, the predominance of vicarious test 
sites have been located in arid regions characterized by high 
frequency of relatively clear sky conditions and large areas of 
uniform, spectrally flat, radiance; 
7. Techniques for lunar and stellar calibration are promising and 
deserve further trials and experimentation; 
8. Traceability to SI Units is required to ensure that calibration 
metadata are comparable between sensors (e.g., internal and 
external calibration, comparison of spectral bandwidths, 
geopositional accuracies, etc.). 
5. REFERENC PUBLICATION 
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and Methods of Computation, NIMA InnoVision. 
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International Commission on Illumination (CIE), 1987. 
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