دورية أكاديمية
A semi-automated, GIS-based framework for the mapping of supraglacial hydrology
| العنوان: | A semi-automated, GIS-based framework for the mapping of supraglacial hydrology |
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| المؤلفون: | Eleanor A Bash, Colette Shellian, Christine F Dow, Greg Mcdermid, Will Kochtitzky, Dorota Medrzycka, Luke Copland |
| المصدر: | Journal of Glaciology, Vol 69, Pp 708-722 (2023) |
| بيانات النشر: | Cambridge University Press, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Environmental sciences LCC:Meteorology. Climatology |
| مصطلحات موضوعية: | Glacier hydrology, glacier mapping, remote sensing, Environmental sciences, GE1-350, Meteorology. Climatology, QC851-999 |
| الوصف: | Supraglacial drainage networks play an integral role in both glacier dynamics and run-off timing, and mapping them provides insight into their role in glacial systems. Here we present a reproducible approach for semi-automated mapping of supraglacial hydrologic features, which complements existing work in automated and manual mapping by providing clear definitions for identification of features. This framework uses a digital terrain model (DTM) to identify potential flow routes on the glacier surface, which are then classified using a set of standardized rules based on the DTM and an orthomosaic. We found that the normalized difference water index calculated from digital imagery was influenced by image brightness and introduce a new approach using average RGB values to correct for this. Using this framework we mapped supraglacial drainage networks at Nàłùdäy and Thores Glacier, Canada. The framework was easier to implement with high-resolution (0.5 m) imagery and DTMs, compared to data with lower resolution (10 m), due to the increased detail in topography and feature boundaries at high-resolution. Lower-resolution data captured larger streams (>2 pixels wide), however, indicating that the framework can still be used at this resolution. Mapping supraglacial hydrology using standardized methods opens possibilities for investigating many questions relating to changes in supraglacial hydrology over time. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0022-1430 1727-5652 |
| Relation: | https://www.cambridge.org/core/product/identifier/S0022143022000922/type/journal_article; https://doaj.org/toc/0022-1430; https://doaj.org/toc/1727-5652 |
| DOI: | 10.1017/jog.2022.92 |
| URL الوصول: | https://doaj.org/article/55b638b0ed8f4e7287cc1e614526014c |
| رقم الأكسشن: | edsdoj.55b638b0ed8f4e7287cc1e614526014c |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 00221430 17275652 |
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| DOI: | 10.1017/jog.2022.92 |