Table 6.251 — DRM_Spatial_Index_Related_Features
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Property |
Description |
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Class |
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Superclass |
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Subclass |
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Definition |
An instance of this DRM class specifies an aggregation of <DRM Feature Hierarchy> objects in which each <DRM Feature Hierarchy> component represents a different tile within a spatially indexed (tiled) organization of <DRM Primitive Feature> objects within a transmittal. The <DRM Spatial Index Data> link object corresponding to each component A <DRM Feature Hierarchy> instance indicates which tile it represents. This DRM class exists to allow <DRM Feature Representation> objects to be organized (tiled) according to some regular spatial index. If the value of the sparse field is FALSE, all column and row entries are present; otherwise one or more entries are not present. The column_count field specifies the number of cells along the X axis. The row_count field specifies the number of cells along the Y axis. The column_width field specifies the length of a cell in the given unit along the X axis. The row_width field specifies the length of a cell in the given unit along the Y axis. The spacing_unit field specifies the unit of measurement used for the spacing of the spatial index. |
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Clarifications |
1 An association between two <DRM Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship. 2 An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship. 3 An association between a <DRM Property Grid> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) represented by the <DRM Feature Representation> instance and the <DRM Property Grid> instance (or some specific cell data within that <DRM Property Grid> instance) have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship. Each associated <DRM Property Grid> instance will indicate whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question. 4 An association between two <DRM Feature Representation> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship. 5 An association between a <DRM Geometry Hierarchy> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship. 6 An association between a <DRM Property Grid> instance and a <DRM Feature Representation> instance indicates that the environmental object(s) represented by the <DRM Feature Representation> instance and the <DRM Property Grid> instance (or some specific cell data within that <DRM Property Grid> instance) have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship. Each associated <DRM Property Grid> instance will indicate whether the entire <DRM Property Grid> instance or only some specific cell data within it is participating in the relationship in question. 7 This relationship exists to support attributes for derived objects. That is, these components are used only to specify texture mapping information for geometry that is to be derived from the <DRM Aggregate Feature> instance by the consumer. These <DRM Image Mapping Function> instances shall use <DRM Image Anchor> components to specify the mapping. 8 This is needed for cases in which a <DRM Aggregate Feature> instance is significant only for a particular domain, such as radar. 9 This is the origin of the collection, which is the lower-left corner. |
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Class diagram |
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Inherited field elements |
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Field elements |
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Associated to (one-way) (inherited) |
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Associated to (one-way) |
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Associated by (one-way) (inherited) |
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Associated by (one-way) |
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Associated with (two-way) (inherited) |
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Associated with (two-way) |
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Composed of (two-way) (inherited) |
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Composed of (two-way) |
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Composed of (two-way metadata) (inherited) |
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Composed of (two-way metadata) |
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Component of (two-way) (inherited) |
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Component of (two-way) |
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Constraints |
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Example(s) |
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