Radar profiling data collected on Breidamerkurjokull in 2009

5-MHz ground-based radar data were collected along three transects roughly follow the ice-flow direction. These three profiles are located each in slow (150-200 m/a, transect a), intermediate (150-250 m/a, transect b), and fast (300-400 m/a, transect c) -flowing regimes of the glacier. Two profiles (a1 and a2) were made for the slow-flow transect for the redundancy purpose. The data are provided in Matlab format. Each profile (a1, a2, b1, c1) has structure including: horizontal positions x and y in the Universal Transverse Mercator (UTM) coordinate (meters), vertical position z above the WGS84 ellipsoid (meters), radar waveform (1024 samples per trace), corresponding two-way travel time (seconds), sampling rate of the radar waveform in nanosecond (10 nsec for this dataset), and days of the year of 2007 and seconds of the day when each radar trace is recorded. No processing is applied to the radar waveforms. However, the echo from the basal interface of the glacier and echoes from within the glacier are clearly recorded.本数据集包含沿三条大致沿冰流方向布设的剖面采集的5-MHz地基雷达数据。三条剖面分别对应冰川的三个流动速率区间：慢速流动区（150~200米/年，剖面a）、中速流动区（150~250米/年，剖面b）与快速流动区（300~400米/年，剖面c）。为保障数据冗余性，慢速流动剖面布设了两条子剖面（a1与a2）。数据以Matlab格式存储。每条子剖面（a1、a2、b1、c1）均包含以下数据字段：通用横轴墨卡托（Universal Transverse Mercator, UTM）坐标系下的水平位置x、y（单位：米），WGS84椭球面以上的垂直位置z（单位：米），雷达波形（每道含1024个采样点），对应的双向传播时间（单位：秒），雷达波形的采样率（本数据集为10纳秒），以及每条雷达道的记录时刻：2007年的年积日与当日秒数。所有雷达波形均未经过预处理，但冰川底部界面的回波与冰川内部的回波均清晰记录。