Table 5 Comparison of surface elevations by Seasat and optical survey along EGIG line

Surface elevation maps of the southern half of the Greenland subcontinent are produced from radar altimeter data acquired by the Seasat satellite. A summary of the processing procedure and examples of return waveform data are given. The elevation data are used to generate a regular grid which is then computer contoured to provide an elevation contour map. Ancillary maps show the statistical quality of the elevation data and various characteristics of the surface. The elevation map is used to define ice flow directions and delineate the major drainage basins. Regular maps of the Jakobshavns Glacier drainage basin and the ice divide in the vicinity of Crete Station are presented. Altimeter derived elevations are compared with elevations measured both by satellite geoceivers and optical surveying.

本数据集基于 Seasat 卫星搭载的雷达高度计获取的观测数据，生成格陵兰次大陆南部区域的地表高程图。数据集附带处理流程概述与回波波形数据示例。研究人员利用该高程数据生成规则网格，并通过计算机绘制等高线，得到地表高程等值线图。辅助图集展示了高程数据的统计质量指标与地表各类特征。该高程图可用于确定冰流方向，勾画出主要冰川流域盆地。本数据集还提供了雅各布港冰川（Jakobshavns Glacier）流域以及克里特站（Crete Station）附近冰盖分水岭的标准地图。研究人员将高度计反演得到的高程数据，与卫星大地测量接收机及光学勘测获取的高程数据进行了对比。