Using a Web Map Service to map Little Ice Age glacier extents at regional scales
نویسندگان
چکیده
Abstract Extending the record of glacier area changes into past improves our understanding climate change impacts. Although analogue maps showing historic extents are abundant, digital outlines from before satellite era sparse as digitisation moraines and trimlines on freely available images is challenging. With now very high-resolution provided by Web Map Services (WMS), new doors open for precise digitisation. Here, we used ESRI WMS to digitise Little Ice Age (LIA) present since LIA in four selected regions along with a detailed uncertainty analysis. We modern starting point additionally consulted Sentinel-2 images, ArcticDEM interpretation. Dating records literature allowed calculating rates. In total, 493 glaciers (4640 km 2 , 891 ice bodies 3590 ) were digitised, yielding relative −20% (−0.14% −1 ), −15% (−0.10% −26% (−0.16% −61% (−0.19% Alaska, Baffin Island, Novaya Zemlya tropics, respectively. The great asset precisely map trimlines, but information about timing related requires further sources.
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Volume 1, The Earth system: physical and chemical dimensions of global environmental change, pp 504–509
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ژورنال
عنوان ژورنال: Annals of Glaciology
سال: 2023
ISSN: ['1727-5644', '0260-3055']
DOI: https://doi.org/10.1017/aog.2023.39