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If a search keyword represents the "Noun" in the data content, such as Ozone, this is more useful in the above heuristic than if it is a modifier. Thus "Column", as in "Total Column Ozone" or "Total Column SO2" is less useful than "Ozone" in this respect.  The curated GCMD keywords, which focus more on the "nouns" than the modifiers may be useful in discriminating these two.

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Temporal and Spatial Coverage Heuristic

When the user has supplied a date range, data collections that cover the entire range are more relevant than data collections that cover only part of the range.

When the user has supplied a spatial constraint, data collections that cover the entire constraint are more relevant than data collections that cover only part of the constraint.

Data Version Heuristic

Two versions of the same data collection should have adjacent relevancies, with the later version as the more relevant.  (This may be overridden by the Data Content Search-Keyword Heuristic when measurements are added to later versions.)

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