URI: http://www.qualityml.org/1.0/measure/FlagAreas
Name: Flag areas
Alternative names:  
Definition:

This quality measure indicates if a data has the presence of some detected as anomalous such as snow or cloud. In the case that the measure is provided as a pixel level quality, the resulting parameters are presented in the form of a data mask.

Parameters: The "reason" provides the reason the value is marked as a flag. Possible values are "snow", "cloud", "shadow" etc.
Source: A3C
Classes: Completeness
Further information: Typically used in imagery to mark pixels that show "snow" instead of "land" behind, covered by clouds, are in the shadow of a cloud, etc. It c an be reported as a boolean per pixel or a percentage of "flagged" pixels in an scene. This metrics is particularly relevant when building big mosaics of several scenes where, despite the efforts of the producer, some parts of the mosaic area are covered by any of the scenes and result in nodata values. This metrics is particularly relevant when building big mosaics of several scenes where, despite the efforts of the producer, some parts of the mosaic area cannot be covered with better scenes and still contain snow, cloud, shodows or other artefacts.