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dc.contributor.authorBennett, L. T.
dc.contributor.authorJudd, T. S.
dc.contributor.authorAdams, M. A.
dc.date.accessioned2020-09-23T05:19:23Z
dc.date.available2020-09-23T05:19:23Z
dc.date.issued2000-11-01
dc.identifier.citationBennett, L. T., Judd, T. S., & Adams, M. A. (2000). Close-range vertical photography for measuring cover changes in perennial grasslands. Journal of Range Management, 53(6), 634-641.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/4003159
dc.identifier.doi10.2458/azu_jrm_v53i6_bennett
dc.identifier.urihttp://hdl.handle.net/10150/643819
dc.description.abstractWe describe a method of close-range vertical photography and digital image analysis for measuring changes in total projective cover in perennial tussock grasslands of semi-arid Australia. Repeated photographs of permanent plots (1 m2) were classified using supervised image analysis, providing a clear and objective record of the effects of single-burns on grass cover relative to controls. Computer simulations of the photographic set-up indicated that errors due to camera perspective were consistently less than 4% across a range of cover classes. Other errors, including misclassification error, were not quantified because simplified laboratory tasks indicated that conventional field methods, such as point sampling and visual estimation, provided unreliable estimates of grass cover and were therefore not suitable benchmarks for assessing the photographic method. However, the presented data indicate that the photographic method was sufficiently accurate and precise to measure treatment effects over time and to elucidate relationships between independent growth parameters across a range of cover conditions. In addition, the photographic method was inexpensive, involved minimal field time, and utilised commercial software to classify images. It has the clear advantage over more traditional methods of providing outputs that are readily archived for retrospective studies.
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectgrassland condition
dc.subjectThemeda triandra
dc.subjectphotography
dc.subjectWestern Australia
dc.subjectground photogrammetry
dc.subjectground cover
dc.subjectimage analysis
dc.subjectsemiarid grasslands
dc.subjectaccuracy
dc.subjectestimation
dc.subjectfires
dc.subjectfire effects
dc.subjectbiomass
dc.subjectbunchgrass
dc.subjectnorthwest Australia
dc.subjectpermanent quadrats
dc.subjectprescribed burning
dc.subjectrangelands
dc.subjectThemeda triandra Forsskal
dc.titleClose-range vertical photography for measuring cover changes in perennial grasslands
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
dc.description.collectioninformationThe Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume53
dc.source.issue6
dc.source.beginpage634-641
refterms.dateFOA2020-09-23T05:19:25Z


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