Rock glaciers in the French Alps - inventory of diplacement rates and orthoimages of destabilized landforms in the period 1945 - 2018@en

The present dataset is the basis for the article from Marcer et al. (in review) \"Rock glaciers throughout the French Alps accelerated and destabilised since 1990 as air temperatures increased\". The dataset describes displacement rates and destabilisation for all the rock glaciers in the region of the French Alps during the years 1945-2018. The methodology used is manual feature tracking of moving boulders on rock glaciers surfaces observed on time lapsed orthoimagery. Most of the orthoimagery we used is already made freely accessible by the the French National Institute of Geography (IGN) through the online portal www.geoportail.com. We computed additional orthoimages on landforms of particular interest, i.e. presenting destabilisation evidence. In this dataset we provide raw feature tracking observations, measured displacement rates and additional orthoimages we computed. All geodata are readable on a GIS software and referenced in EPSG:2154. Other data are provided as CSV spreadsheets.本数据集为Marcer等人（待审稿）的论文《法国阿尔卑斯山区自1990年起随气温升高，全境岩质冰川加速运动并失稳（Rock glaciers throughout the French Alps accelerated and destabilised since 1990 as air temperatures increased）》提供了基础支撑。本数据集记录了1945年至2018年间法国阿尔卑斯山区全境岩质冰川（rock glaciers）的运动速率与失稳状态。本研究采用的方法为：对时序正射影像（orthoimagery）中观测到的岩质冰川表面移动岩块开展人工特征追踪。本研究使用的大部分正射影像已由法国国家地理研究所（IGN）通过门户网站www.geoportail.com免费开放获取。针对存在失稳迹象的特定地貌，本团队额外计算生成了正射影像。本数据集包含原始特征追踪观测结果、实测运动速率以及我们额外生成的正射影像。所有地理数据均可在地理信息系统（GIS）软件中读取，空间参考坐标系为EPSG:2154。其余数据以CSV电子表格格式提供。