Evaluation of photographic properties for area estimation

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dc.contributor.authorWiles, Steven Jayen
dc.contributor.committeechairSmith, James L.en
dc.contributor.committeememberJohnson, Steven D.en
dc.contributor.committeememberScrivani, John A.en
dc.contributor.departmentForestryen
dc.date.accessioned2014-03-14T21:45:16Zen
dc.date.adate2012-09-08en
dc.date.available2014-03-14T21:45:16Zen
dc.date.issued1988-05-15en
dc.date.rdate2012-09-08en
dc.date.sdate2012-09-08en
dc.description.abstractFrom the known image positional errors on aerial photographs, this thesis computes and evaluates acreage estimation errors. Four hypothetical tracts were used in simulating aerial photographs with 104 different camera orientation combinations. Flying heights of 4000 and 6000 feet, focal lengths of 24 and 50 millimeters with and without lens distortion, and tilts of 0, 3, 6, and 12 degrees were simulated. The 416 photographs were all simulated with the camera exposure station centered above the midpoint of the respective tract's bounding rectangle. The topographic relief of the tracts ranged from 19 feet in the Coastal Plain to 105 feet in the Piedmont. It was found that lens focal length did not have an independent effect on the acreage estimates. Relief error, the lowest, averaged -0.080%. In comparison, small errors in calculating scale were shown to be larger than relief errors. Tilt was recommended to be limited to six degrees, averaging +1.6% error at six degrees tilt. Because of its positive exponential nature when the tracts are centered, tilt can induce large biases. including tilts from zero to six degrees,the average was 0.634%. Lens distortion error averaged -0.686%. Overall, the average acreage error was 0.363% for simulations up to and including six degrees of tilt with and without lens distortion. This result is for centered tracts, and it was felt many of the errors were compensating given this situation. In conclusion, the photographic images can estimate areas to $1%, however, additional errors are imparted during actual measurement of the photographs.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 100 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09082012-040604en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09082012-040604/en
dc.identifier.urihttp://hdl.handle.net/10919/44695en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1988.W545.pdfen
dc.relation.isformatofOCLC# 18354238en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.W545en
dc.subject.lcshAerial photography in forestryen
dc.subject.lcshAeronautics in forestryen
dc.titleEvaluation of photographic properties for area estimationen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineForestryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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