Persistent Link:
http://hdl.handle.net/10150/347833
Title:
Reliability of photography for traffic measurement
Author:
O'Grady, James Bradley
Issue Date:
1973
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
This thesis describes a simplified method for estimating distances directly from terrestrial photographs. It was felt that any method devised must overcome present limitations and meet three basic criteria to be practical. These criteria are: 1) that the method require no subject-visible markings, 2) that it require no special equipment or training to use, and 3) that it provides sufficient accuracy to be useful. A number of possible methods were considered, and were evaluated against these criteria. the Accuacy ( reliablity) of the methods was tested using a variety of statistical tests. The recommended method consists of first selecting a reference distance whose length is known. This reference should be in a plane parallel to and approximately the same distance from the camera as the desired distance. It was found that a vehicle dimension such as the tire track gives consistently the best results. Both the reference and the desired distances are then scaled on the photograph and a ratio is applied to drectly estimate the desired distance. Greatest reliability is achieved when the subject is directly in fromt of, or behind the camera and at a distance between 50 and 250 feet. By following thers guidelines the stated objectives can be met by using this method.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Traffic engineering.; Travel time (Traffic engineering) -- Measurement.; Traffic flow -- Measurement.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Civil Engineering; Graduate College
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleReliability of photography for traffic measurementen
dc.creatorO'Grady, James Bradleyen
dc.contributor.authorO'Grady, James Bradleyen
dc.date.issued1973en
dc.publisherThe University of Arizona.en
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en
dc.description.abstractThis thesis describes a simplified method for estimating distances directly from terrestrial photographs. It was felt that any method devised must overcome present limitations and meet three basic criteria to be practical. These criteria are: 1) that the method require no subject-visible markings, 2) that it require no special equipment or training to use, and 3) that it provides sufficient accuracy to be useful. A number of possible methods were considered, and were evaluated against these criteria. the Accuacy ( reliablity) of the methods was tested using a variety of statistical tests. The recommended method consists of first selecting a reference distance whose length is known. This reference should be in a plane parallel to and approximately the same distance from the camera as the desired distance. It was found that a vehicle dimension such as the tire track gives consistently the best results. Both the reference and the desired distances are then scaled on the photograph and a ratio is applied to drectly estimate the desired distance. Greatest reliability is achieved when the subject is directly in fromt of, or behind the camera and at a distance between 50 and 250 feet. By following thers guidelines the stated objectives can be met by using this method.en
dc.description.noteThis item was digitized from a paper original and/or a microfilm copy. If you need higher-resolution images for any content in this item, please contact us at repository@u.library.arizona.edu.en
dc.typetexten
dc.typeThesis-Reproduction (electronic)en
dc.subjectTraffic engineering.en
dc.subjectTravel time (Traffic engineering) -- Measurement.en
dc.subjectTraffic flow -- Measurement.en
thesis.degree.nameM.S.en
thesis.degree.levelmastersen
thesis.degree.disciplineCivil Engineeringen
thesis.degree.disciplineGraduate Collegeen
thesis.degree.grantorUniversity of Arizonaen
dc.identifier.oclc700950111en
dc.identifier.bibrecord.b64810823en
dc.identifier.callnumberE9791 1973 43en
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