SNZ GeoRadar snow depth

Snow depth is measured using GeoRadar along the SNZ transect running from the coastline towards the top of Aucella (ending in about 400 meters above sea level). 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）沿SNZ断面开展雪深测量，该断面起自海岸线，向Aucella峰顶部延伸，终点海拔约400米。测量工作主要在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，基准为WGS 84，投影带为27N。2016年，地质雷达系统测量方案被应用于GeoBasis积雪监测项目。通过将实测双向传播时间与沿该断面开展的人工雪深测量结果进行关联，可实现雪深估算：基于人工测量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」计算得到雪深。所有断面的双向传播时间、人工测量数据、近似波速以及估算雪深，均与测点坐标和所用天线的频率参数一同记录存档。