The LPV has been established with the realization that proper validation requires a significant
scientific effort. Indeed, the subgroup has been established to conduct global validation activities
as efficiently as possible. The validation approaches described here have all been conceived to
minimize the resource requirements for global LC validation. To this end, the LPV has capitalized
on the most current sensor technologies (high-resolution) and exploited data-sharing opportunities
with both the CEOS core sites and the use of GOFC/GOLD regional networks to reduce the cost
and effort of global validation efforts. The LPV subgroup is collaborating with the MODIS LC
and GLC 2000 programs to help realize and develop these suggestions. This, in turn, can be applied
to future global LC products.
This chapter presents the approach for the use of the CEOS to coordinate the validation efforts
of global land products. This premise is based on experience from previous global validation through
the IGBP, which depended on the goodwill, support, cooperation, and collaboration of interested
organizations and institutions. Two global LC efforts are now underway: (1) NASA's MODIS
Global LC product and (2) the European Commission's GLC 2000. These validation efforts will
likewise require coordination and collaboration — much of which has been or is being established.
In this chapter we discussed issues pertaining to validation of global LC products, presented a brief
overview of the validation strategy for the two current efforts, then described a mutually beneficial
strategy for both to realize some efficiencies by using CEOS to further coordinate their validation
efforts. This strategy should be applicable to other global LC mapping efforts, such as those being
developed for the GOFC/GOLD and beyond.
Thanks are extended to Yves-Louis Desnos, as chair of the CEOS Working Group on Calibration
and Validation, for continued attention to the CEOS Core Site concept. The authors would like to
acknowledge John Hodges, Boston University, for providing Plate 3.1. Also, reviews from Ross
Lunetta and anonymous reviewers were helpful and appreciated.
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