Images from focused synthetic aperture radar processing of echogram data with delay and sum antenna array processing, Greenland, 2009

To better understand processes affecting the ice sheets and to supply boundary condition information into ice sheet models and ice thickness for other ice sheet analysis, the Center for Remote Sensing of Ice Sheets (CReSIS) has designed, developed, and deployed several multichannel radar depth sounders in Greenland. This dataset contains data collected mostly around outlet glaciers in Greenland, including dense grids around Jakobshavn, Helheim, and Kangerlussuaq glacier channels, with the specific purpose of improving understanding in this dynamic and fast changing part of the ice sheet. This product uses focused synthetic aperture array (SAR) processing to improve resolution in along-track. The array processing technique used to combine the multiple channels is based on the periodogram method also known as delay and sum beamforming. This product is a pdf file for convenient browsing of the imagery. Files are named according to the format: /{$segment_id}.pdf. The segment ID is YYYYMMDD_SS where YYYY is the 4-digit year (e.g. 2011), MM is the 2-digit month from 1 to 12, DD is the 2-digit day of the month from 1 to 31, and SS is the segment number from 0 to 99. For example, “20080627_05.pdf” contains data from segment 05 taken on 2008-06-27. More information can be found in “Readme.pdf”.

为更好地理解影响冰盖的相关过程，并为冰盖模型提供边界条件信息、为其他冰盖分析工作提供冰厚数据，美国冰盖遥感中心（Center for Remote Sensing of Ice Sheets，CReSIS）已在格陵兰岛设计、开发并部署了多套多通道雷达测深仪。本数据集采集的数据主要覆盖格陵兰岛的出口冰川区域，包括雅各布港（Jakobshavn）、赫尔海姆（Helheim）以及康格路斯瓦克（Kangerlussuaq）冰川航道周边的密集测网，其核心目标是增进对冰盖这片动态且快速变化区域的认知。该产品采用聚焦合成孔径阵列（synthetic aperture array，SAR）处理技术以提升沿轨分辨率。用于多通道数据融合的阵列处理技术基于周期图法，该方法也被称为延时求和波束成形（delay and sum beamforming）。本产品为PDF格式文件，便于用户浏览影像。文件命名遵循如下格式：/{$segment_id}.pdf。其中段标识符为YYYYMMDD_SS格式：YYYY为4位年份（例如2011），MM为1至12的2位月份，DD为1至31的2位日期，SS为0至99的段序号。例如，"20080627_05.pdf"包含2008年6月27日采集的第05段数据。更多详细信息可参阅"Readme.pdf"。