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 row and column indexes of a cell within a regular spatial relationship of cells. <Spatial Index Data> link objects are used within spatial index related aggregations to distinguish sibling branches of the aggregations. The indexes for row and column are one-based.

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

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

See the <Spatial Index Related Features> class, the <Spatial Index Related Geometry> class, the <Spatial Index Related Feature Topology> class, and the <Spatial Index Related Geometry Topology> class for examples.

FAQs

No FAQs supplied.

Constraints

Inherited Field Elements

This class has no inherited field elements.

Field Elements

SE_Integer_Positive row_index; 1
SE_Integer_Positive column_index; 2

Notes

Fields Notes

row_index

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

column_index

The column_index field specifies the column within the spatial index related aggregation to which the specified cell belongs.


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Last updated: July 26, 2006 Copyright © 2006 SEDRIS