…or matching Georectification of Historic Aerial Photographs for Douglas County, Kansas ESRI Education Users Conference 2004 Rhonda Houser, University.

…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.