KAS Symposium
Geospatial Analysis in the Great Plains
Oral Presentation Title/Authors
DIGITAL ORTHOPHOTOGRAPHY QUARTER QUADRANGLE (DOQQ) DATA AND PRODUCTS.
Thomas D. METTILLE, Kenneth A. NELSON, David F. HOGBEN, and Erik
PATTON. Kansas Geological Survey--DASC, 1930 Constant Ave., Lawrence,
Kansas 66047
Abstract
The State of Kansas Geographic Information Systems (GIS) Policy Board
conducted a digital orthophotography pilot project to test the utility of
differing Digital Orthophotography Quarter Quadrangle (DOQQ) products and
bring to light problems associated with implementing DOQQs in a statewide
GIS system. DOQQs are highly accurate rectified scanned aerial photographs
that are tied to a real-world coordinate system and can be used in
conjunction with other geospatial datasets. Pilot applications were tested
by the state's GIS Data Access and Support Center (DASC) and summarized in
a report drafted by DASC staff. The oral presentation will address
properties of a USGS standard DOQQ product, results of pilot applications,
and user considerations for implementing DOQQs in their GIS system. The
presentation will detail some of the issues associated with using DOQQs,
such as: image formats and compression, spatial resolution, tiling schemes,
and coordinate systems. Finally the presentation will outline the benefits
of using DOQQs as a common base for heads-up digitizing and conflating
existing data sources.
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