Standards /

WCPS-Manual / fieldExpr

The fieldExpr element specifies a unary induced field selection operation. Fields are selected by their name, in accordance with the WCS range field subsetting operation.

NOTE Due to the current restriction to atomic range fields, the result of a field selection has atomic values too.

Let

C1 be a coverageExpr
comp be a fieldName which is a range field of type t within rangeType(C1).

Then,

for any coverageExpr C2
where

C2 = C1 . comp

C2 is defined as follows:

Example

Let C be a coverage with range type integer. Then the following request snippet describes a single-field, integer-type coverage where each cell value contains the difference between red and green band:

C.red - C.green