| Titre | Lake ice monitoring using multi-polarized SAR imagery |
| |
| Auteur | Geldsetzer, T ;
van der Sanden, J; Brisco, B |
| Source | Proceedings of the 30th Canadian symposiumon remote sensing/Comptes rendus du 30e symposium canadien sur la télédétection; 2009 p. 16-25 |
| Image |  |
| Année | 2009 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20090133 |
| Réunion | 30th Canadian Symposium on Remote Sensing; Lethbridge; CA; juin 22-25, 2009 |
| Document | livre |
| Lang. | anglais |
| Media | papier |
| Province | Yukon |
| SNRC | 116O/13; 116O/14; 117A/04; 117A/05; 117B/01; 117B/08 |
| Région | Old Crow Flats; Vuntut National Park |
| Lat/Long OENS | -140.5000 -139.0000 68.3333 67.7500 |
| Sujets | télédétection; glace; imagerie radar; eaux lacustres; lacs; géophysique |
| Illustrations | graphiques; imagerie satellitaire |
| Résumé | (disponible en anglais seulement)
C-band SAR imagery is used to monitor lake ice phenology in Old Crow Flats, Yukon. Single-polarization RADARSAT-1 (HH), dual-polarization ENVISAT-ASAR (VV, HH),
and dual-polarization RADARSAT-2 (HH, HV) imagery are applied. During spring ice breakup, backscatter mean and standard deviation are sampled at various incidence angles. Backscatter (HH, HV, VV) and backscatter ratios (VV/HH, HV/HH) are evaluated in
terms of ice / water contrast. Backscatter and ratio thresholds are then calculated for classifying decaying ice and open water. In winter, co-polarized and cross-polarized imagery are evaluated for discriminating floating ice and grounded ice.
During ice breakup, results show strong spatial variability in backscatter signatures. HV imagery provides a robust basis for discriminating ice and open water; HH imagery provides a reliable basis for discriminating ice and open water, but only at
large incidence angles and low wind speeds. During winter, co-polarized imagery is required to discriminate floating and grounded ice; two types of floating ice are identified. This work is part of the "Understanding Canada from Space" Program of the
Earth Sciences Sector, Natural Resources Canada. It is financially supported, in part, by the Government Related Initiatives Program of the Canadian Space Agency. Parks Canada is both the targeted end user and research partner. |
| GEOSCAN ID | 247767 |
|
|