Volume 11: OGC CDB Core Standard Conceptual Model

This document is an OGC Member approved international standard. This document is available on a royalty free, non-discriminatory basis. Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.

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i. Abstract

This Open Geospatial Consortium (OGC) standard defines the conceptual model for the OGC CDB Standard. The objective of this document is to provide an core conceptual model for a CDB data store (repository). The model is represented using UML (Unified Modeling Language). The conceptual model is comprised of concepts, schema, classes and categories as well as their relationships, which are used to understand, and/or represent an OGC CDB data store. This enables a comparison and description of the CDB data store structure on a more detailed level. This document was created by reverse-engineering the UML diagrams and documentation from the original CDB submission OGC Common DataBase Volume 1 Best Practice, 2015 as a basis for supporting OGC interoperability. One of the important roles of this conceptual model is to provide a UML model that is consistent with the other OGC standards and to identify functional gaps between the current CDB data store and the OGC standards baseline. This document references sections of Volume 1: OGC CDB Core Standard: Model and Physical Database Structure [OGC 15-113r5].

ii. Keywords

The following are keywords to be used by search engines and document catalogues.

ogcdoc, OGC document, UML, conceptual model, raster, tiles, vector, CDB, Common Data Base, simulation, visualization, synthetic environment.

iii. Preface

The industry-maintained CDB model and data store structure has been discussed and demonstrated at OGC Technical Committee meetings since September 2013. This document, the first UML conceptual model for OGC CDB standard, is one of the 15 documents that comprise the OGC CDB modular standard. The UML conceptual model establishes a single set of consistent concepts that could be also implemented using other encoding mechanisms.

The CDB standard is originally based on the OGC CDB Best Practice documents, which were submitted to the OGC by CAE Inc. on behalf of the CDB implementation community and user group. CDB is currently widely implemented in the defense and aviation simulation communities. The intent is that this initial OGC version of the CDB standard be backwards compatible with existing implementations but that terminology and concepts be aligned as appropriate with the OGC technical baseline. Future work is planned to align the standard with other OGC standards and to provide Best Practices focused on how to use CDB with the existing OGC standards baseline, such as CityGML, Web Map Service (WMS), Web Feature Service (WFS), and Web Coverage Service (WCS). A GeoPackage capability was defined for version 1.2 of the OGC CDB standard.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium shall not be held responsible for identifying any or all such patent rights.

Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation.

iv. Submitting organizations

The following organizations submitted this Document to the Open Geospatial Consortium (OGC):

Organization name(s)

The OGC CDB standard is based on and derived from an industry developed and maintained specification, which has been approved and published as OGC Best PracticeDocument 15-003: OGC Common DataBase Volume 1 Main Body. An extensive listing of contributors to the legacy industry-led CDB specification is at Chapter 11, pp 475-476 in that OGC Best Practices Document (https://portal.opengeospatial.org/files/?artifact_id=61935 ).

v. Submitters

All questions regarding this submission should be directed to the editor or the submitters:

vi. Future Work

The CDB community anticipates that additional standardization will be required to prescribe content appropriate to targeted simulation applications. In its current form, the CDB standard does not mandate synthetic environmental richness, quality and resolution. In Version 1.1, additional informative clauses were incorporated that provide guidance on how to include and encode global (data store wide) and local (data set specific) geospatial metadata.

The OGC CDB Standards Working Group (SWG) members understand there is a requirement for eventual alignment of the CDB standard with the OGC/ISO standards baseline. In Version 1 of the CDB standard, effort was invested to begin aligning terminology and concepts, specifically in the coordinate reference system discussions and requirements.

The current version of the CDB standard is fully backwards compatible with version 1.0 of the CDB standard as defined and implemented by the current CDB implementer and user community. The requirements for a CDB data store are focused on the ability to store, manage, and access extremely large volumes of geographic content. In this version of the standard, initial harmonization with the OGC and ISO standards baseline has begun. For example, where appropriate, the CDB simulation community terms and definitions have been replaced with OGC/ISO terms and definitions. Further, the standards documents have been reorganized and structured to be consistent with the OGC Modular Specification Policy. However, the CDB SWG and community recognize the need to further harmonize and align this standard with the OGC baseline and other IT best practices. There has already been considerable discussion in this regard.

Based on such discussions and comments received during the public comment period, the following future work tasks are envisioned:

Making these enhancements will allow the use and implementation of a CDB structured data store for application areas other than aviation simulators.

vii. CDB Document Guide

This document contains a number of annexes related to the OGC CDB Core standard.

For the purposes of being able to cross reference this OGC Best Practice with the previous versions of the CDB standard, the following annex “crosswalk” is provided.

For ease of editing and review, the standard has been separated into 16 Volumes, one being a schema repository.

viii. Terms, Definitions, and Abbreviations

Please refer to Volume 3: Terms and Definitions for terms used in this document (http://www.opengeospatial.org/standards/cdb). Abbreviations used in this CDB Volume are:

BMT Base Material Table

CMT Composite Material Table

DEM Digital Elevation Model

DIGEST Digital Geographic Exchange Standard

DGIWG Defence Geospatial Information Working Group

FDD Feature Data Dictionary

LOD Level of Detail

SEDRIS Synthetic Environment Data Representation and Interchange Specification

UHRB Ultra-High Resolution Building (data)