Monitoring Arctic Permafrost - Crowdsourced Ice-wedge Polygon Center Points

This dataset contains four files of points representing the approximate centers of ice-wedge polygons in two different regions: Cape Blossom (CB), located on Baldwin Peninsula in western Alaska, USA "Blueberry Hills" (BH), located in the Mackenzie river delta north of Aklavik, Northwest Territories, Canada Volunteered Geographic Information (VGI) datasets were collected by volunteer contributors of the UndercoverEisAgenten project (funded by German Federal Ministry of Education and Research), using a bespoke web application for crowd-sourced mapping. Volunteers contributed primarily in the frame of workshops at schools and universities organized as mapping events ("mapathons"). The participants consisted of university level Geography students in Germany (two mapping events) and the Netherlands (one mapping event) and school students in grades 7–12 (approximate age range 12-18 years, seven mapping events) in German Higher Secondary Education (Gymnasium). Contributions to the mapping projects were made from a total number of 105 distinct user accounts. Participants were instructed to mark the approximate centroids of ice-wedge polygons within the respective boundaries of each task area. Each task was assigned to more than one contributor. Along with the VGI data, an additional set of polygon center points in the same two study areas was contributed by experts for the purpose of quality assessment. The research areas were analyzed by three creators of this dataset with the help of GIS software. Both volunteers and experts identified ice-wedge polygon centers based on aerial imagery datasets of permafrost landscape acquired by the Modular Camera System (CB) and a high-resolution UAV orthomosaic (BH) acquired together with students of Moose Kerr School, Aklavik, NWT, Canada.本数据集包含四个点位文件，分别代表两处不同区域内冰楔多边形的近似中心： 布鲁姆角（Cape Blossom, CB），位于美国阿拉斯加州西部的鲍德温半岛 “蓝莓山”（Blueberry Hills, BH），位于加拿大西北地区阿克拉维克以北的麦肯齐河三角洲 志愿地理信息（Volunteered Geographic Information, VGI）数据集由“UndercoverEisAgenten”项目（由德国联邦教育与研究部资助）的志愿贡献者采集，采用定制的众包测绘网页应用完成数据采集。志愿贡献主要依托学校与高校举办的测绘工作坊（亦称“测绘马拉松”，mapathons）开展。参与者涵盖德国（2场测绘活动）与荷兰（1场测绘活动）的高校地理专业学生，以及德国完全中学（Gymnasium）7至12年级（年龄区间约12-18岁）的中学生（7场测绘活动）。本次测绘项目累计共有105个独立用户账号参与贡献。参与者需在各任务区域的边界范围内标注冰楔多边形的近似质心，每项任务均分配给多名参与者完成。 除志愿地理信息数据外，同一两处研究区域内的另一组多边形中心点数据集由专家贡献，用于开展质量评估。本数据集的三位创建者借助地理信息系统（Geographic Information System, GIS）软件对研究区域进行了分析。 志愿者与专家均基于永久冻土景观的航空影像数据集识别冰楔多边形中心：其中CB区域采用模块化相机系统（Modular Camera System）获取的影像，BH区域则使用与加拿大西北地区阿克拉维克的穆斯·克尔学校（Moose Kerr School）学生共同采集的高分辨率无人机正射影像（UAV orthomosaic）。