ZC-2 GeoRadar snow depth

Snow depth is measured using GeoRadar in two North-South oriented rows in the ZEROCALM grid 2, on a south facing slope south of the landing strip. Measurements are primarily conducted by end of winter, before snow melt is initiated. Positions are given in UTM coordinates (WGS 84, UTM Zone 27 N). Systematic measurements with GeoRadar were implemented in the GeoBasis snow monitoring in 2016. The measured two-way travel time is used to estimate the snow depth by relating this to manual measurements of the snow depth performed along the transect. From linear relationships between the manually measured depths and the travel time, an approximated velocity is found and the snow depth estimated from depth = velocity * one way travel time. For all transects the two way travel time, manual measurements, the approximated velocity and estimated snow depth is recorded alongside the coordinates and information regarding the frequency of the antenna used.

本数据集采用地质雷达（GeoRadar）在ZEROCALM网格2内的两条南北向测线开展雪深测量，测线位于跑道南侧的朝南坡地。测量工作主要于冬末融雪启动前完成。测点坐标采用通用横轴墨卡托（UTM）坐标系（WGS 84，UTM 27 N带）标注。2016年，GeoBasis积雪监测项目正式启用了地质雷达的系统性测量方案。通过将实测双向传播时间与沿测线获取的人工雪深测量结果进行关联，可基于该传播时间估算雪深：首先基于人工实测雪深与传播时间的线性关系求得近似电磁波速，再通过公式「雪深=波速×单程传播时间」完成雪深估算。所有测线的双向传播时间、人工实测数据、近似波速以及估算雪深结果，均会与测点坐标及所用天线频率信息一并记录存档。