Because of the limitations on using Radar technology to obtain surface elevation data, there are many problems in the original SRTM DEM data.
由于利用雷达技术获取地面高程数据技术本身的限制，SRTM原始dem数据中存在着很多问题。
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Perhaps the best-known, near-global, space-borne data-set prior to the German venture came from the US Shuttle Radar Topography Mission (SRTM) of 2000.
Derived from Shuttle Radar Topography Mission (SRTM) data, the white line around the valley in the top image approximates the Lake Suguta shoreline when water levels were at their highest.