snow pit stratigraphy - manual measurement

Snow pit stratigraphy, obtained during annual surveys at the end of the snow season. Missing information is indicated by -9999 for numerical and '-' for text columns.本数据集为雪季末年度调查中获取的雪坑地层学（Snow pit stratigraphy）数据。其中数值型字段的缺失信息以-9999标记，文本型字段的缺失信息以'-'标记。