Database Design Concepts and Data Integration
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1 Database Design Concepts and Data Integration URISA February 9 th, 2005 Bob Earle 3/10/2005 1
2 Agenda A few Design tips and guidelines, some of which I learned the hard way Many GIS staff get database design and maintenance thrust upon them The r evolution of GIS at Sacramento County; how we became a data integrator, but not necessarily by plan
3 Design of a Spatial system is like any other Enterprise application
4 Earlier is Better
5 Translation of User Requirements Business Rules Model the User s View
6 Entity Relationship Diagram Good design tool, good communication tool
7 Access ERD (Relationships) You may already have an ERD tool and not know it
8 UML May look complicated, but at its heart is the ERD
9 Sacramento County ERD
10 Normalization Remove Repeating Groups Every non-key column must be dependent on all parts of the primary key No non-key column may be functionally dependent on another non-key column Introduced by E.F. Codd
11 Every attribute will refer to the Primary key, the whole key and nothing but the key, so help me Codd A table should have a field that uniquely identifies each of its records, and each field in the table should describe the subject that the table represents Database Design for Mere Mortals by Michael Hernandez
12 Database Data Models
13
14
15 Metadata
16 Database Design Fallacies Design your system to replicate existing practices You can throw your data model away when you have implemented your database I will just put it in a note Metadata is too much trouble My spreadsheet is good enough GIS shouldn t be putting its nose into everybody s business
17 More Database Design Fallacies Nobody will ever need my data Just import your shapefiles into SDE and voila you have a Geodatabase Normalized data is fast performing data Spatial data is just data
18 Database Design Truths Spatial data is just data Design on paper, then a computer Earlier is better Document deviances from the conceptual design
19 More Database Design Truths Use meaningful attribute and table names Flag for deletion, rather than delete Take the user s key away Use database constraints, rather than coded business rules
20 What is so Special about Spatial Data? How it is the same than regular data Data relationships Integrity Key Asset How it is different Spatial Key (Location is a type of key) Topology Heavy load Long transaction Advanced data type Database
21 Early GIS
22 Community GIS
23 Evolution of the spatial data model Ian McCarg Design With Nature ArcInfo Coverages ArcStorm SDE Shape File Oracle Spatial GeoDatabase True True Spatially Spatially Enabled Enabled Database Database
24 GIS Layers Points Lines Polygons Surfaces
25 3 D
26 Scanned Maps
27 Scanned Documents
28 Attribute Data
29 Orthophotography
30
31
32 Levels of Data Integration
33 If it were a perfect (GIS) World Internet Spatial Transactions Universal Regional Database Departmental Documents
34 I can t say it was easy, but I can say it was worth it!!
35 Sacramento County Property Systems (Without data sharing) GHB/GAX Applications (Mainframe) SAP/ COMPASS (Oracle) PDB Application (Mainframe) CPS Unsecured Tax Application (Oracle) APS Permits system (Oracle) Utility Billing/ CUBS (SAP?,Oracle?) Planning Public Works Direct Levy Maintenance Application GIS (ESRI)
36 Sacramento County Property Systems GHB/GAX Applications (Mainframe) SAP/ COMPASS (Oracle) PDB Application (Mainframe) CPS Unsecured Tax Application (Oracle) County-wide Shared Property Data Warehouse APS Permits system (Oracle) Utility Billing/ CUBS (SAP?,Oracle?) Planning Public Works Direct Levy Maintenance Application GIS (ESRI)
37 Examples of Shared Data Benefits Tax Rate Areas Vineyards Utility Billing Minimize data redundancy and costs in the Regional Cooperative
38 Data Ownership, Dissemination, and Accessibility Policies Ownership - Departments own their data, GIS is the middleman Dissemination - Open Access, Cooperative Mapping based on Standards Access - Concerns over safety
39 Database Architecture Transactional Transactional Warehouse Warehouse Shared Shared Firewall
40 Summary - Benefits of Good Design Data integrity Flexibility in data retrieval and analysis Follows business rules and therefore supports organizational requirements Easier to share data Different users access same data Accommodates different views of the data Minimal Data Redundancy Breaks out of Spreadsheet mentality
41 Questions, Comments?
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