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| Titel |
Testing the Reliability of Manual Mapping of Glacial Landforms: Initial Results |
| VerfasserIn |
John K. Hillier, Mike J. Smith |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102253
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| Publikation (Nr.) |
 EGU/EGU2015-1562.pdf |
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| Zusammenfassung |
| Mapped topographic features are important for understanding processes that sculpt the
Earth’s surface. Manual, interpretive, techniques for mapping are commonly used yet, it is
difficult to assess their effectiveness. Here ‘real’ DEMs are modified by inserting ‘synthetic’
drumlins in to them [Hillier and Smith, 2012] for mappers to identify. Interactive maps are
presented that display 12,121 outlines drawn by 25 interpreters searching for a total of
21,625 drumlins. Overall detection rates (i.e. ncoincident/ntotal) are low at 34-40%,
interestingly comparable to automated methods [Eisank et al., 2014], but reliability
(i.e. ncoincident/nmapped) is higher at 72-86%. A pilot study also indicates that
drumlin height is the key dimension driving detectability, with rates decreasing from
100% to |
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