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Data Management

Database management system (DBMS) uses the data models specifications in establishing consistency in the data management. To this end a data model must have three basic components,

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A spatial database is a type of database that is designed to store and manage spatial data, which represents objects defined in a geometric space.

Data Model

A data model is a way of demonstrating the framework or structure and relationships of data in a database. Utilised to represent, organize, and manage data in a systematic and consistent manner. Spatial data models are a critical component of geographic information systems (GIS) and are designed to facilitate the storage, retrieval, analysis, and visualization of geographic information. There are several types of spatial data models, each with its own approach to representing spatial data.

Database Structure

The Queensland Government stores its topographic data as feature classes of similar data themes within a spatial Postgres database. This ESRI cloud-based database is the point of truth for topographic data and stores the data in geographic coordinates (latitude and longitude) on the Geocentric Datum of Australian 2020 (GDA2020). Each dataset within the database is accompanied by metadata that describes the dataset, licensing, and attribution to ISO19115/ISO19139 standard. Additionally, an editable database is available within this environment that allows for the management, maintenance, and creation of features.

Reference System

Reference system, also known as a spatial reference system, is a framework for specifying and locating geographic phenomena in a standardized and consistent manner. These systems define a set of rules and parameters that enable the accurate positioning and referencing of objects or locations on the Earth's surface. They are essential for spatial data integration, analysis, and mapping. There are several key components within a spatial data reference system:

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The Queensland Government Digital Topographic Data is currently represented as vector features in geographic coordinates (Latitude/Longitude) using Geocentric Datum of Australia 2020 (GDA2020) reference system with elevations (where stored) on Australian Height Datum (AHD71).

Data Types

Data types represented in Queensland Government’s Topographic Data set, comprises of vector data models containing objects in point, line, and polygon format.  Attributes are associated with these geometric objects to provide additional information.  The vector data model is suitable for representing discrete, well-defined features and is often used for mapping, cartography, and spatial analysis.