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A vegetation database for the Colorado River ecosystem from Glen Canyon Dam to the western boundary of Grand Canyon National Park, Arizona
U.S. Government
Paperback. Books LLC, Reference Series 2011-10-04.
ISBN 9781234442880
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Förlagets beskrivning
Original publisher: Reston, Va. : U.S. Geological Survey, 2008. OCLC Number: (OCoLC)233634641 Subject: Riparian areas -- Arizona -- Grand Canyon National Park -- Classification. Excerpt: ... Results 9 identified in their information needs for riparian vegeta-Accuracy Assessment of Vegetation tion. Vegetation information for a larger minimum mapping Classification unit can be obtained by using formation-level categories; by combining alliances, such as tamarisk and seep willow classes, Confusion matrices ( Congalton, 1991 ) were constructed © within an ArcMap ? ( ESRI, ArcMap 9.2 ) framework; or by for the identified vegetation and unvegetated classes to reanalyzing the imagery at a coarser scale. determine classification accuracies. For these assessments, groundtruth vegetation polygons were compared with super-vised classification polygons with areas greater than 0.01 ha. Groundtruth vegetation polygons were delineated in October Results 2003 and June 2004 with a minimum mapping scale of 0.01 ha. Groundtruth polygons were designated using the identified mapping classes. Revision of Alliance-Level Classification Fuzzy Accuracy Assessment TWINSPAN analysis revealed 12 and 6 interpretable veg-etation classes for cover values 3 and 4, respectively ( table 3A Comparing accuracies between pixel-based classified and B ). The first division separated higher elevation xeromor-imagery and groundtruth polygons presented scale problems. phic and facultative riparian vegetation from lower elevation Fuzzy accuracy assessment was also employed to assess map facultative and obligate riparian and marsh vegetation. Within classification accuracies. Fuzzy accuracy assessment was first group " 0, " species fell out along a hydrologic gradient that described by Gopal and Woodcock ( 1994 ) as an alternative separated obligate wetland and riparian species from faculta-assessment approach that allows for degrees of membership tive species. The greatest difference in groups between c
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A vegetation database for the Colorado River ecosystem from Glen Canyon Dam to the western boundary of Grand Canyon National Park, Arizona
Bokrecensioner » A vegetation database for the Colorado River ecosystem from Glen Canyon Dam to the western boundary of Grand Canyon National Park, Arizona
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