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”.

为了更好地理解影响冰盖的过程，并为冰盖模型提供边界条件信息，同时为其他冰盖分析提供冰厚数据，冰盖遥感中心（Center for Remote Sensing of Ice Sheets, CReSIS）已在格陵兰岛设计、开发并部署了多台多通道雷达测深仪。该数据集包含主要在格陵兰岛 outlet冰川（outlet glacier）周围采集的数据，包括雅各布港（Jakobshavn）、海尔海姆（Helheim）和康格鲁苏瓦克（Kangerlussuaq）冰川通道附近的密集网格数据，其具体目的是增进对冰盖这一动态且快速变化区域的理解。本产品采用聚焦合成孔径阵列（synthetic aperture array, SAR）处理技术以提高沿航迹方向的分辨率。用于组合多通道的阵列处理技术基于周期图法（periodogram method），也称为延迟求和波束形成（delay and sum beamforming）。本产品为PDF文件，便于图像浏览。

文件命名遵循以下格式：/{$segment_id}.pdf。segment ID（segment ID）由YYYYMMDD_SS组成，其中YYYY为4位年份（例如2011），MM为2位月份（1-12），DD为2位日期（1-31），SS为段号（0-99）。例如，"20080627_05.pdf"包含2008年6月27日采集的第05段数据。更多信息可参见"Readme.pdf"文件。