In a GIS, a data model is an abstract representation of geographic data. The model itself is platform independent, while specific implementations of a model are not. The models provided on this site are specific to ESRI software.
Publishing Oakland County's version of these data models provides the GIS community with a starting point for the modeling process, and promotes the development and utilization of federal and local standards.
Though the GIS Utility is publishing these models, please note that they are a work in progress, and may change as needs and technology develop. Please check back for updated versions and new models.
A PDF of the model poster, which can be viewed on screen using Acrobat Reader, or can be plotted. (Data Model Poster)
A Visio diagram of the model, which can be viewed on screen using Microsoft Visio 2000 or can be plotted. (Data Model Diagram)
An empty personal geodatabase schema, which can be used to create a new personal geodatabase using ESRIs ArcCatalog 8.3. The spatial reference of the schema is specific to Oakland County and may need to be altered. (Database Schema)
This is the Facilities data model, which contains 3 feature datasets that include Communications, FacilitiesAndStructures and HazardousSites. Educational and industrial features as well as tornado sirens, hospitals, golf courses, and leaking underground storage tanks are an example of the feature classes contained within. Each feature class in the model is point geometry except WANFiber, which is line geometry. There are no topology rules established within this model. Domains are used for many of the attributes. Metadata is available for most feature classes.
Database Schema (zip of geodatabase, file size 219k; January, 2004) Because of the advanced geodatabase functionality incorporated into this model, an ArcInfo license is required to load data.
The Hydrography data model includes design concepts from ESRI's ArcHydro data model and the National Hydrography Dataset (NHD) known as NHDinGEO. The model contains point, line, and polygon geometry as well as a geometric network and two relationship classes. Also included in the model are tables that manage unique IDs across the entire Hydrography dataset. These IDs are helpful when using the ESRI ArcHydro tools, which model hydrologic flow for water resource management. This data model does not currently contain metadata.
Database Schema (zip of geodatabase, file size 152k; April, 2004) Because of the advanced geodatabase functionality incorporated into this model, an ArcInfo license is required to load data.
This is the latest version of the Land Management model, which incorporates roads, parcels, the Public Land Survey System (PLSS) framework, and administrative areas such as municipal boundaries and legislative districts. The model includes topology rules for each feature dataset along with related domain value tables. The purpose behind this design was to help users manage these complicated, interdependent datasets in one cohesive model using core ArcGIS functionality.
Expected future enhancements to this data model will include site and mailing addressing, parcel value and assessment. In addition, necessary methodology to maintain the complex topological relationship between municipal district boundaries (and dependent datasets) and the road centerlines and parcel boundaries is being developed.
Database Schema (metadata to be included soon) (zip of geodatabase, file size 129k; May, 2005) Because of the advanced geodatabase functionality incorporated into this model, an ArcInfo license is required to load data.
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