1. 2007 Indiana GIS Conference City of Bloomington Contour Update Project Laura Haley, GIS Manager haleyl@bloomington.in.gov

2. 2007 Indiana GIS Conference Contour Update Project History of Previous Projects Contour Updates from 2005 Statewide Data How Bloomington Uses Contour Data

3. 2007 Indiana GIS Conference 1991-1992 Orthophotography, Planimetric, and Contour Mapping. Used Traditional Photogrammetric Techniques

4. 2007 Indiana GIS Conference 1998 Update Project Topography updated only in areas of significant change.

5. 2007 Indiana GIS Conference 2005 Statewide Orthophotography Project

6. 2007 Indiana GIS Conference New Contour Generation Earth Data International Used additional control available not used in state project and recalculated the AT. Created a DTM (mass points and breaklines) Generated 2 Foot Contours and Spot Elevation Points.

7. 2007 Indiana GIS Conference New vs. Old Accuracy, Display, Density

8. 2007 Indiana GIS Conference

10. Using our Data Planning Department Development Review, Long Range Planning, & Environmental Planning Identifying areas of concern; steep slopes, karst features, floodplain, and drainage issues Environmental Resource Inventory – Sensitive Area Analysis

11. 2007 Indiana GIS Conference Sinkhole Identification Locate Depressed Contours Areas of Karst Topography

12. 2007 Indiana GIS Conference Identified closed contours and field checked. Green – Potential Sinkholes Red – Sinkholes

13. 2007 Indiana GIS Conference City & Utilities Engineering Planning & Preliminary Design Work for Capitol Improvement Projects; sidewalks, street improvements, water, sanitary sewer, and storm water systems. Base elevation reference for assets. Drainage Assessment – Identifying drainage basins, smaller drainage areas, and storm water detention/retention areas.

14. 2007 Indiana GIS Conference Sidewalk Plan Drawing

15. 2007 Indiana GIS Conference Delineating Drainage Basins

16. 2007 Indiana GIS Conference City of Bloomington Contour Update Project Laura Haley, GIS Manager haleyl@bloomington.in.gov