SUBRANGE DATA TYPE APPLIED TO DEFINITION OF SUCH VIRTUAL COORDINATE SYSTEMS WHERE THE DOMAINS ARE CONSTRAINED BY GEOMETRIC BOUNDARIES OF EACH OBJECT

Abstract

Modern dynamic program languages such as ADA, PASCAL, MODULA'2 give us further possibilities to generalize the idea of classical real numbers. There are many applications in GIS where it is not possible to effectively model the invidual values of attributes neither with integer data type (N) nor positive integer numbers (Z). For instance an elevation of object such as attributes could oscillate between lower and upper limits. Those limits are always determined by the information environment. In case of subrange data type the declaration may be the following: high-type = 200 ... 700, where 200 is the lower and 700 is the upper limit within a territory.