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Comparison of watershed boundaries derived from SRTM and ASTER digital elevation datasets and from a digitized topographic map

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dc.contributor.authorPryde, J. K.en
dc.contributor.authorOsorio, J.en
dc.contributor.authorWolfe, Mary Leighen
dc.contributor.authorHeatwole, Conrad D.en
dc.contributor.authorBenham, Brian L.en
dc.contributor.authorCardenas, A.en
dc.contributor.departmentSustainable Agriculture and Natural Resource Management (SANREM) Knowledgebaseen
dc.coverage.spatialEcuadoren
dc.date.accessioned2016-04-19T19:20:27Zen
dc.date.available2016-04-19T19:20:27Zen
dc.date.issued2007en
dc.description.abstractWatersheds are natural integrators of hydrological, biological, and geological processes and as such require an integrated approach to data analysis and modeling, which usually starts delineating accurately a polygon vector layer of watershed boundaries as input. In that way, the Río Illangama watershed in Alto Guanujo, Ecuador, had been isolated with the objective of evaluate the accuracy of watershed boundaries derived from three different sources: One was delineated by hand and the other two were derived from a 30-m ASTER DEM and a 90-m SRTM DEM, using the Spatial Analyst extension of ArcGIS. Visually, there are small differences between the manually-delineated and the SRTM-based boundaries, while the ASTER-based varies from the manually-delineated one. The area of the watershed delineated manually is 13,061.3 ha, while the SRTM-based and the ASTER-based watershed are 0.66% and 2.6% larger. The regression analyses comparing the complete boundaries yielded an R2 of 0.999 between the SRTM and manual boundaries and the 0.988 for the ASTER and the manual boundaries. The t-test comparing DEMs indicated a significant difference (pen
dc.description.notesavailable in SANREM office, ESIILTRA-3 (Watershed-based NRM for Small-scale Agriculture)en
dc.format.mimetypeapplication/pdfen
dc.identifier2834en
dc.identifier.citationPresented at the 2007 ASABE Annual International Meeting, Minneapolis Convention Center, Minneapolis, MN, 17-20 June 2007en
dc.identifier.other2834_Pryde_et_al_ASABE_2007.pdfen
dc.identifier.urihttp://hdl.handle.net/10919/67140en
dc.language.isoen_USen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectGISen
dc.subjectModelingen
dc.subjectWatershed managementen
dc.subjectNatural resource managementen
dc.subjectEcuadoren
dc.subjectSANREMen
dc.subjectDigital elevation model (dem)en
dc.subjectAsteren
dc.subjectSRTMen
dc.subjectWatershed delineationen
dc.subjectWatersheden
dc.titleComparison of watershed boundaries derived from SRTM and ASTER digital elevation datasets and from a digitized topographic mapen
dc.typePresentationen
dc.type.dcmitypeTexten

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