Glaciers in Alaska with subsetting by watershed and SASAP region

Glaciers in Alaska were analyzed by watershed and region of Alaska for the State of Alaska Salmon and People (SASAP) project. 188 watersheds and thirteen regions were assessed for number of intersecting glaciers, area covered by glaciers, and other glaciers statistics as described in "Glaciers.ipynb" in this package. Glaciers data is based on the River Analysis Project (RAP) dataset as outlined in "A Riverscape Analysis Tool Developed to Assist Wild Salmon Conservation Across the North Pacific Rim" by Whited, D. C., J. S. Kimball, J. A. Lucotch, N. K. Maumenee, H. Wu, S. D. Chilcote, and J. A. Stanford (2012). Glacier polygons in the RAP dataset were provided directly by the authors and are based on 1990s-era Landsat 4 and 5 satellite data, with methodology outlined in the publication above. Regions are determined by the SASAP project and watersheds are based on HUC8 definitions from the International Joint Commission and sub-sub-drainages from the Canadian National Hydro Network.

本研究服务于阿拉斯加三文鱼与人类（State of Alaska Salmon and People，SASAP）项目，按阿拉斯加的流域与区域对境内冰川开展了系统性分析。本数据包内的《Glaciers.ipynb》文件详述了针对188个流域与13个区域的评估内容，涵盖相交冰川数量、冰川覆盖面积及其他冰川相关统计指标。冰川数据基于河流分析项目（River Analysis Project，RAP）数据集，该数据集的相关说明详见Whited D.C.、Kimball J.S.、Lucotch J.A.、Maumenee N.K.、Wu H.、Chilcote S.D.与Stanford J.A.于2012年发表的论文《A Riverscape Analysis Tool Developed to Assist Wild Salmon Conservation Across the North Pacific Rim》。RAP数据集中的冰川多边形矢量数据由该论文作者直接提供，其数据来源为20世纪90年代的Landsat 4与Landsat 5卫星遥感数据，相关方法学细节已在前述论文中阐明。区域划分由SASAP项目确定，流域划分则依据国际联合委员会（International Joint Commission）制定的8级水文单元编码（Hydrologic Unit Code 8，HUC8）标准，以及加拿大国家水文网络的次级次级流域范围。