The Value in Aerial Photography

The Value in Aerial Photography
•Comprehensive views
•Increase our understanding of forests,
watersheds, agricultural and urban areas
•Study temporal changes
Uses of aerial photography
Environmental studies/assessment
Determining historic land use
Assessing environmental sites
Documenting historical sites
Tracking vegetation change (growth or
reduction)
River/runoff trends
Its Used By
Inside Government
Assessor
Planning and Zoning
Surveyor
Environmental compliance/regulatory
Outside Government
Lawyers
Environmental Assessments Firms
Historians
Archeologists
Agriculture
Utilities
Sources of Historical Photography
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County
• US Air Force
Cities/towns
• others????
USDA (FSA)
INDOT
IDNR
Indiana State Archives
Utilities and other
NGOs
Historical INDOT film listing by county
Photography media & scanning
• Original film (1st generation; best source)
• Contact prints (2nd or 3rd generation,
lower resolution)
• Roll film scanning (highest resolution &
best geometric stability)
• Flatbed scanner (medium resolution and
moderate geometry)
Historical INDOT film storage
INDOT film scanner (Leica DSW700 Scanner)
Georeferencing process
2 methods:
• Affine transformation using GIS tool(s)
• Orthorectified using photogrammetric
tool(s)
Output Data
• Resultant data maintains coordinate
system, datum, units of measure
• All common file format types can be
output (TIF, JPG, SID, ECW, etc.)
Georeferencing Examples
Affine Transformation
Orthorectification
Georeferencing Examples
Affine Transformation
Orthorectification
Questions
• Shaun Scholer:
[email protected]
765.973.9385
• Jim Sparks:
[email protected]
317.234.5889
• Chip Campbell:
[email protected]
317.610.7251, ext 298
• Ron Schonegg:
[email protected]
317.679.5457