The SEDRIS Data Representation Model
APPENDIX A - Classes
Spatial Index Data

Class Name: Spatial Index Data

Superclass - <SEDRIS Abstract Base>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies the (1-based) row and column indices of a cell within a regular spatial relationship of cells. <Spatial Index Data> instances are used within spatial-index-related organizations to distinguish sibling branches of the organizations.

Given the origin of the spatial-index-related organization instance, and the row and column widths defined by that organization instance, the location of any cell is determined from its <Spatial Index Data> instance.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

See <<Spatial Index Related Organizing Principle>>, <Spatial Index Related Features>, <Spatial Index Related Geometry>, <Spatial Index Related Feature Topology>, and <Spatial Index Related Geometry Topology> for examples.

FAQs

No FAQs supplied.

Constraints

Inherited Field Elements

This class has no inherited field elements.

Field Elements

SE_Integer_Positive row_index; (notes)
SE_Integer_Positive column_index; (notes)

Notes

Fields Notes


row_index

 The row_index field specifies the row within the
 spatial-index-related organization to which the
 specified cell belongs.

column_index

 The column_index field specifies the column within the
 spatial-index-related organization to which the specified
 cell belongs.
Prev: Spatial Extent. Next: Spatial Index Related Feature Topology. Up:Index.

Last updated: July 16, 2004 Copyright © 2004 SEDRIS™