Ground Penetrating Radar data acquired over Von Postbreen, Svalbard, March 2018.

GPR data and diffraction focusing Madagascar code Data authors: Richard Delf and Robert Bingham, University of Edinburgh. Data and code associated with Delf et al. "Reanalysis of polythermal glacier thermal structure using radar diffraction focussing" Ground-Penetrating Radar data was acquired over Von Postbreen, Svalbard, to investigate the internal velocity structure by diffraction focusing. Data were acquired in March 2018 over 2 days, using a PulseEkko Pro 25 MHz system, towed behind a snowscooter in an in-line, common-offset configuration. Data are stored in the SEGY format. Differential GPS was used for positioning; coordinates are included in the SEGY data. <strong>Data Description</strong> Three groups of data are present here within the .zip file. data with no preprocessing: files in ./data/aq_data/18_VP_0_*.SGY SEGY Radar data with pre-processing applied. Significant ringing is observed in the upper regions of the radargrams. Note file names do not correlate with the files in subsequent folders. data with preprocessing: filenames in ./data/raw_data/18_VP_1_*.SGY SEGY Radar data with pre-processing applied to remove ringing and other noise using an SVD filter and bandpass filtering. Radargrams are sorted into shorter lines across and up the glacier. See associated paper for additional details. processed_data: filenames 18_VP_2_*.SGY The same data as above, with diffraction coherence after Schwarz et al (2019) applied. See associated paper for additional details. <strong>Processing files:</strong> SConstruct: Madagascar SConstruct file for processing the above profiles to derive the velocity profiles described in the associated (Delf et al) paper.本数据集包含探地雷达（Ground-Penetrating Radar，GPR）数据与衍射聚焦相关的马达加斯加（Madagascar）地球物理处理软件代码。数据集作者为Richard Delf与Robert Bingham，供职于爱丁堡大学。本数据集与配套代码关联于Delf等人发表的论文《利用雷达衍射聚焦重新分析多温冰川热结构》。 研究团队于2018年3月开展了为期两天的数据采集工作，采集区域位于斯瓦尔巴群岛的冯·波斯特冰川（Von Postbreen），旨在通过衍射聚焦技术探究冰川内部速度结构。本次采集采用PulseEkko Pro 25 MHz系统，将设备挂载于雪地摩托后方，以串列共偏移距采集构型完成数据获取。所有数据以SEGY格式存储，定位采用差分GPS（Differential GPS）技术，坐标信息已内嵌于SEGY格式数据文件中。 <strong>数据说明</strong> 本次压缩包内包含三组数据： 1. 未预处理数据：路径为./data/aq_data/18_VP_0_*.SGY的SEGY格式探地雷达数据。该数据未经过预处理，雷达剖面图的上部区域存在明显振铃噪声。请注意，本组文件名与后续文件夹内的文件无对应关联。 2. 已预处理数据：路径为./data/raw_data/18_VP_1_*.SGY的SEGY格式探地雷达数据，该数据已通过奇异值分解（Singular Value Decomposition, SVD）滤波与带通滤波去除振铃噪声及其他干扰。预处理后的雷达剖面图已按横穿并沿冰川向上的短测线进行排序。详细信息请参阅关联论文。 3. 处理后数据：文件名为18_VP_2_*.SGY的SEGY格式探地雷达数据。该组数据与上述已预处理数据一致，且已应用Schwarz等人（2019）提出的衍射相干性算法。详细信息请参阅关联论文。 <strong>处理脚本：</strong> SConstruct文件：适配马达加斯加（Madagascar）地球物理处理软件的脚本文件，用于将上述测线剖面数据处理为关联论文（Delf等人）中所述的速度剖面。