Utilizing Repeated GPS Surveys from Field Operations for Development of Agricultural Field DEMs

dc.contributor.author Aziz, Samsuzana
dc.contributor.author Steward, Brian
dc.contributor.author Tang, Lie
dc.contributor.author Karkee, Manoj
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T03:33:44.000
dc.date.accessioned 2020-06-29T22:37:25Z
dc.date.available 2020-06-29T22:37:25Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2012-12-03
dc.date.issued 2009-01-01
dc.description.abstract <p>Topographic data collected using RTK-DGPS-equipped farm vehicles during field operations could addadditional benefits to the original capital investment in the equipment through the development of high-accuracy field DEMs. Repeated surveys of elevation data from field operations may improve DEM accuracy over time. However, minimizing the amount of data to be processed and stored is also an important goal for practical implementation. A method was developed to utilize repeated GPS surveys acquired during field operations for generating field-level DEMs. Elevation measurement error was corrected through a continuity analysis. Fuzzy logic (FL) and weighted averaging (WA) methods were used to combine new surveys with past elevation estimates without requiring storage and reprocessing of past survey data. After 20 surveys were included, the DEM of the study area generated with FL and WA methods had an average root mean squared error (RMSE) of 0.08 m, which was substantially lower than the RMSE of 0.16 m associated with the DEM developed by averaging all data points in each grid. With minimum control of errors in elevation measurements, the effect of these errors can be reduced with appropriate data processing, including continuity analysis, fuzzy logic, and weighted averaging. Two years of GPS surveys of elevation data from field operations could reduce elevation error by 50% in field DEMs.</p>
dc.description.comments <p>This article is from <a href="http://elibrary.asabe.org/abstract.asp?aid=27775&t=3&dabs=Y&redir=&redirType=" target="_blank"><em>Transactions of the ASABE</em></a>, 52, no. 4 (2009): 1057–1067.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/14/
dc.identifier.articleid 1022
dc.identifier.contextkey 3506827
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/14
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/874
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/14/Steward_2009_UtilizingRepeatedGPS.pdf|||Fri Jan 14 20:05:45 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Digital elevation model
dc.subject.keywords Fuzzy logic
dc.subject.keywords GPS
dc.subject.keywords Topography
dc.title Utilizing Repeated GPS Surveys from Field Operations for Development of Agricultural Field DEMs
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isAuthorOfPublication e60e10a5-8712-462a-be4b-f486a3461aea
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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