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2007 Indiana GIS Conferen ce City of Bloomington Contour Update Project Laura Haley, GIS Manager [email protected]
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2007 Indiana GIS Conference
City of Bloomington Contour Update Project
Laura Haley, GIS Manager
2007 Indiana GIS Conference
Contour Update Project
• History of Previous Projects
• Contour Updates from 2005 Statewide Data
• How Bloomington Uses Contour Data
2007 Indiana GIS Conference
1991-1992 Orthophotography, Planimetric, and Contour Mapping.
Used Traditional
Photogrammetric
Techniques
2007 Indiana GIS Conference
1998 Update Project
Topography updated only
in areas of significant
change.
2007 Indiana GIS Conference
2005 Statewide Orthophotography Project
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.
2007 Indiana GIS Conference
New vs. OldAccuracy, Display, Density
2007 Indiana GIS Conference
2007 Indiana GIS Conference
2007 Indiana GIS Conference
Using our DataPlanning DepartmentDevelopment Review, Long Range
Planning, & Environmental Planning
• Identifying areas of concern; steep slopes, karst features, floodplain, and drainage issues
• Environmental Resource Inventory – Sensitive Area Analysis
2007 Indiana GIS Conference
Sinkhole Identification
Locate Depressed Contours
Areas of Karst Topography
2007 Indiana GIS Conference
Identified closed
contours and field
checked.
Green – Potential
Sinkholes
Red – Sinkholes
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.
2007 Indiana GIS Conference
Sidewalk Plan Drawing
2007 Indiana GIS Conference
Delineating Drainage Basins
2007 Indiana GIS Conference
City of Bloomington Contour Update Project
Laura Haley, GIS Manager
