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| Titel |
MODIS snow cover mapping accuracy in a small mountain catchment – comparison between open and forest sites |
| VerfasserIn |
J. Parajka, L. Holko, Z. Kostka, G. Blöschl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-30), S.2365-2377 |
| Datensatznummer |
250013384
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| Publikation (Nr.) |
 copernicus.org/hess-16-2365-2012.pdf |
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| Zusammenfassung |
| Numerous global and regional validation studies have examined MODIS snow mapping
accuracy by using measurements at climate stations, which are mainly at open
sites. MODIS accuracy in alpine and forested regions is, however, still not
well understood. The main objective of this study is to evaluate MODIS
(MOD10A1 and MYD10A1) snow cover products in a small experimental catchment
by using extensive snow course measurements at open and forest sites. The
MODIS accuracy is tested in the Jalovecky creek catchment (northern
Slovakia) in the period 2000–2011. The results show that the combined Terra
and Aqua images enable snow mapping at an overall accuracy of 91.5%. The
accuracies at forested, open and mixed land uses at the Červenec sites
are 92.7%, 98.3% and 81.8%, respectively. The use of a 2-day temporal
filter enables a significant reduction in the number of days with cloud
coverage and an increase in overall snow mapping accuracy. In total, the
2-day temporal filter decreases the number of cloudy days from 61% to
26% and increases the snow mapping accuracy to 94%. The results
indicate three possible factors leading to misclassification of snow as
land: patchy snow cover, limited MODIS geolocation accuracy and mapping
algorithm errors. Out of a total of 27 misclassification cases, patchy snow
cover, geolocation issues and mapping errors occur in 12, 12 and 3 cases,
respectively. |
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