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Census and spatial data in sql server 2008 designing tools for hazard mitigation and analysis
- 1. Census and Spatial Data in SQL Server 2008: Designing Tools for Hazard Mitigation and Analysis Scott Rae and David Raybuck North Central Texas Council of Governments
- 2. NCTCOG Region 12,800 square miles 16 counties 225 cities 134 school districts 29 special districts
- 3. NCTCOG Emergency Management Roles Functions Mitigation Response Rapid Access to Data Methods Reporting Mapping Real-Time Analysis
- 4. Data Issues Quality Reliability Efficiency to Build New Data Sets Efficiency to Maintain New Data Sets Dynamic Interaction Automation of Data Flow Speed
- 5. Data Needs Storm Events Flood Plains Earthquakes Drought Structure Values by Category Live Radar Data Live Storm Events Census
- 6. Radius Summaries (emeritus) Circa 2001-2010
- 9. Radius Summary Antiques GIS Recordset (Loop Sum) GIS Constructed Query (Loop Query Build) SQL Algebra
- 10. Selecting by Circle using TSQL power((power(( @ptdx - [xcoord]),2) + power((@ptdy -[ycoord]),2)),0.5) < @bufferstring
- 11. SQL 2008 Spatial update test2008.dbo.TxGeo_Logrecno set geo9= geography::STPointFromText('POINT(' + STR(Longitude, 20, 16) + ' ' + STR(Latitude, 20, 16) + ')', 4326)
- 12. SQL 2008 Spatial Selecting by Polygon set @g = geography::STGeomFromText('POLYGON ((- 96 31.4,-97 32.1,-97.1 32.1,-97.5 31.7 ,-97.8 31.7, -96 31.4))', 4326); SELECT * FROM dbo.txgeo_B WHERE (@g.STIntersects(geog)) = 1
- 14. Rapid On-the-Fly Reporting Queries by Geometry Queries by Attribute Web Users SQL Server SQL Reporting Services
- 15. Advantages Speed Indexing Expand to Millions of Records No Geodatabase or GIS Objects Overhead TSQL Spatial types on Spatial Types
- 16. Polygon Updating Housing Units in Updated Area Impacted Storm Direction Storm Speed Persons in Path Path 7:12:00 PM 855.36 sq miles East-southeast 32 mph 36,468 13,346 7:22:00 PM 770.81 sq miles East 25 mph 33,074 12,187 7:38:00 PM 644.52 sq miles East 33 mph 12,001 4,544 7:50:00 PM 156 sq miles East 21 mph 954 407
- 17. Managing Data Flows into SQL 2008 .NET/TSQL XML/HTTP Partner Servers SQL 2008 .NET/TSQL Programmers FME Workbench .NET/TSQL Web Editors
- 18. Web Editing of Spatial Features
- 21. The Logic Inferring numeric polygon values from another polygon layer
- 22. If I have population by Census block…
- 23. …what is the population of this triangle?
- 26. The ArcGIS Way 1. Calculate original area into source field 2. ArcToolbox Intersect source with target 3. Calculate new area into result field 4. Calculate overlap % (result area / original area) 5. Multiply this % by value(s) to infer 6. Summary Statistics Sum (group by Unique ID of target)
- 27. The SQL Server 2008 Way SELECT Target.UniqueID, SUM(PercentOfTarget * SourceValue) FROM ( SELECT Source.UniqueID, Target.UniqueID, Source.SourceValue, Source.geom.STIntersection(Target.geom).ST Area() / Target.geom.STArea() AS PercentOfTarget FROM Target INNER JOIN Source on Source.geom.STIntersects(Target.geom) = 1 ) GROUP BY Target.UniqueID
- 28. The Grid Optimizing for the web
- 29. Bing Maps Tile Quadkeys Length of the key in digits indicates the level of detail (aka zoom level) Each quadkey starts with the quadkey of the parent grid (the next largest square containing it)