ZC-1 GeoRadar snow depth

Snow depth is measured using GeoRadar in the ZEROCALM grid 1 in the heath in the vicinity of the climate station. 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），在气候站周边石楠灌丛地带内的ZEROCALM第1网格区域开展积雪深度测量。测量工作主要于冬季末期、融雪启动前进行。测点坐标采用通用横轴墨卡托（UTM）坐标系（WGS 84，UTM 27N带）。2016年，地质雷达系统测量方案被正式纳入GeoBasis积雪监测体系。实测得到的雷达双向走时，需与沿样带开展的人工积雪深度测量结果进行关联以实现积雪深度估算：首先基于人工实测雪深与走时之间的线性关系拟合得到近似的电磁波传播速度，随后通过公式「雪深 = 速度 × 单程走时」计算得到积雪深度估算值。所有样带的相关数据均会被完整记录，包括双向走时、人工测量值、近似传播速度以及估算积雪深度，同时附带测点坐标与所用天线的频率信息。