Difference between revisions of "Coverage Content Information"

A coverage is the distribution of a set of properties (or ranges) on a spatiotemporal domain. When the content type of the coverage is image, there is an implicit interdependency between the coverage properties. Typically, the color of an RGB image cell is the combination of the values of the red, green and blue properties. When the content type of the coverage is physical measurement or classifications, there is barely this kind of interdependency between the different properties even if each property contributes to the definition of the cell range. When the content type is mixed, there is no explicit interdependency but they may exist implicitly (a classification range can be combined with red, green, and blue ranges).

Special Cells may be used to:

In the first case, the record implementing the Special Cell Value shall provide a value for each of the interdependent range elements, e.g. a value for each of the red, green, and blue bands of an RGB image. There isn't necessarily a special cell defined for each of the coverage cells (i.e. for each combination of red, green, and blue in the image) since the intent is to provide a meaning to some specific cells.

In the second case, the Special Cell Value only provides a name, definition for a single value of only one of the range elements. Each record implementing a Special Cell Value provides a value for only one of the range elements. For a given range, there is either no special cells (because there is no predefined domain of value) typically when the range contains a measurement, or a special cell for each value of the range in order to fully document its domain of value.

In mixed coverage, the two types of special cells may occur depending on the interdependency of the ranges.

The properties of Coverage Content Information are listed below.