GCOS Reference Upper-Air Network

GRUAN Technical Note 9 published

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GRUAN Technical Note 9 (GRUAN-TN-9) published with title "GRUAN Site Photographs Guide"

Abstract: This Technical Note outlines the generic steps required to ensure that a long term site photographic record is maintained in support of the documented reference-quality data. The aim is to establish a long-term visual record against which any unaccounted for variability in data measurement can be assessed.

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