Effect of manual digitizing error on the accuracy and precision of polygon area and line length

Simple item page
dc.contributor.authorKeefer, Brenton Janen
dc.contributor.committeechairSmith, James L.en
dc.contributor.committeememberScrivani, John A.en
dc.contributor.committeememberGregoire, Timothy G.en
dc.contributor.departmentForestryen
dc.date.accessioned2014-03-14T21:50:23Zen
dc.date.adate2012-11-20en
dc.date.available2014-03-14T21:50:23Zen
dc.date.issued1988-11-05en
dc.date.rdate2012-11-20en
dc.date.sdate2012-11-20en
dc.description.abstractManual digitizing has been recognized by investigators as a significant source of map error in GIS, but the error characteristics have not been well defined. This thesis presents a methodology for simulating manual digitizing error. Stream mode digitizing error was modeled using autoregressive moving average (ARMA) procedures, and point mode digitizing was stochastically simulated using an uniform random model. These models were developed based on quantification of digitizing error collected from several operators. The resulting models were used to evaluate the effect digitizing error had upon polygon size and total line length at varying map accuracy standards. Digitizing error produced no bias in polygon area. The standard deviation of polygon area doubled as the accuracy standard bandwidth doubled, but the standard deviation was always less than 1.6 percent of total area for stream mode digitizing. Smaller polygons (less than 10 square map inches) had more bias and more variance relative to their size than larger polygons. A doubling of the accuracy standard bandwidth caused a quadrupling of line length bias and a doubling to tripling of the line length standard deviation. For stream mode digitizing, reasonable digitizing standards produced line length biases of less than 2 percent of total length and standard deviations of less than 1 percent of total length. Bias and standard deviation both increased with increasing line length (or number of points), but the bias and standard deviation as a percent of total line length remained constant as feature size changed.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 180 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11202012-040331en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11202012-040331/en
dc.identifier.urihttp://hdl.handle.net/10919/45930en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1988.K443.pdfen
dc.relation.isformatofOCLC# 19254805en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1988.K443en
dc.subject.lcshCartography -- Data processingen
dc.subject.lcshDigital mappingen
dc.titleEffect of manual digitizing error on the accuracy and precision of polygon area and line lengthen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineForestryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
LD5655.V855_1988.K443.pdf
Size:
5.71 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Masters Theses