…or matching georectification of historic aerial photographs for douglas county, kansas esri...
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…or matching
Georectification of Historic Aerial Photographs for Douglas County, Kansas
ESRI Education Users Conference 2004Rhonda Houser, University of Kansas
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Introduction• enhance existing image archive
• contribute to technical methodology
• add to supply of historical spatial data
• create data that can be used with other spatial data
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Background
Scan
• Use air photos from 1930s to 1980s
• Convert print photo to image by scanning
• Determine township, range and section
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Target image- unknown geographic coordinates
Georeference
Reference image- known geographic coordinates
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Coarse adjustment… shift, rotate, etc.
Georeference
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Identify potential links between target…
Georeference
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… and reference image.
Georeference
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Create a link on target image
Georeference
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Create a matching link on reference image
Georeference
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Repeat process to identify matched points
Georeference
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Georeference
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Georeference
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Georeference
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Georectify
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Georectify
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Georectify
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Create Metadata
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Online Image Archive
Air photos are available online:
www2.lib.ku.edu/mapscoll/web/airindex.htm
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Choose quadrant
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Choose area
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Choose year
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View or download image
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Applications land surveying and property valuation geography and remote sensing classes ecological classification wildlife habitat mapping drought detection geology and soil classification transportation studies archaeological/ anthropological sites historic trails
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KU Memorial Stadium 1937
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KU Memorial Stadium 1954
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KU Memorial Stadium 1966
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KU Memorial Stadium 1976
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AcknowledgementsSources of data:• Street data
• Digital orthophoto, county boundary and road data, public land survey system data
• Digital air photo files
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Acknowledgements
Contributors:
• Douglas County Public Works
• Ben Hatfield and Julienne Emry
• Various KU students, staff and faculty
• This investigation was supported by the University of Kansas General Research Fund Allocation #23017831.