This document specifies a fundamental principle on grid square statistics and includes the following:

—     To define or specify a set of methods that can be recommended as the standard method to enable policy decisions based on common recognition from grid statistics produced with different grid square reference system standards in different countries and areas that can have different geographic coding systems with different geometric shapes.

—     To standardize methods to accommodate the conversion calculation among grid statistics with different grid square reference systems having different geometric shapes by employing prorating method based on the grid areas as well as the method to calculate the approximation errors, for exchanging the converted grid statistics.

Spatial expressions other than grid square also exist, but this document does not apply to the spatial expressions other than grid square.

NOTE            Clause 4 and Clause 5 define grid square statistics and specify some methods to generate grid square statistics. Clause 6 recommends conversion methods between grid square statistics generated based on different grid square reference systems.