Historically the U.S. Forest Service has used uncorrected
aerial photographs to delineate proposed and past management
activities on the land base it manages. Transferring a boundary
from an image not planimetrically correct to a planimetrically
corrected image introduces errors. Positional accuracy of
boundaries affects the number of acres the Forest is accountable
for managing, and the annual sale quantity (ASQ) or annual board
feet targets.
The purpose of this study was to develop a methodology that
eliminated the need to transfer the boundary from an uncorrected to
a corrected image. Raster and vector warping methods were
evaluated with reference to positional accuracy and efficiency.
Due to the rugged topography of the Siuslaw National Forest,
selection of ground control points (GCPs) was an important function
in the accurate transformation of images. A Vector warping method,
Rubber Sheeting the ARC/INFO projective transformation for all
digital GCPs, to all of the Global Position System (GPS) ground
control points, provided the most accurate rectification of vector
boundaries that had been digitized or scanned from an uncontrolled
low elevation photograph. / Graduation date: 1992
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37366 |
| Date | 06 June 1991 |
| Creators | Sneed, Jacquelin M. |
| Contributors | Kimerling, A. Jon |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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