The SEDRIS Data Representation Model
APPENDIX A - Classes Environment Root |
---|
An instance of this DRM class is the aggregating object for the <Feature Hierarchy> and / or <Geometry Hierarchy> that represent the instantiation of a collection of all data in a common spatial reference frame in a given transmittal. In other words, an <Environment Root> is the starting point for all objects in the same spatial reference frame in a transmittal.
Earth.
An area of North America that straddles two UTM zones. The <Transmittal Root> would have two <Environment Root> components, one for each of the two UTM zones.
SRM_SRF_Parameters | srf_parameters; |
---|
If different than the <Transmittal Root>'s <Base Time Data>
Dependent on the <Feature Hierarchy> and <Geometry Hierarchy> components. See constraint <Hierarchy Summary Item For Environment Root and Models> for details. Briefly, 1. If only a <Feature Hierarchy> is present, then at most one <Hierarchy Summary Item> instance may be present, namely, one which describes the <Feature Hierarchy>. 2. If only a <Geometry Hierarchy> is present, then at most one <Hierarchy Summary Item> instance may be present, namely, one which describes the <Geometry Hierarchy>. 3. If both a <Feature Hierarchy> and a <Geometry Hierarchy> are present, then each may have a corresponding <Hierarchy Summary Item> instance. It is permissible in this case for only one <Hierarchy Summary Item> instance to be present which corresponds to one of the two hierarchies, but if two <Hierarchy Summary Items> are present, then one shall correspond to the <Feature Hierarchy> and the other to the <Geometry Hierarchy>.
Provides access to all <Variables> defined within the scope of the <Environment Root>, if any. If there are such <Variables>, an <Interface Template> shall be present; otherwise, it shall not be present.
The spatial extent of the <Environment Root> - defines the maximum spatial extents of the component objects
|