两个DEM数据集:SRTM 与NED

SRTM数据集是航天飞机用SAR测出来的,主要有全球90米数据集;一个像素代表3个弧秒,90米。一幅90米数据是5度乘5度,6000乘6000像素。

NED是USGS出的美国数据集,主要有一弧秒(30米)和三分之一弧秒(10米)两种,极少地区有九分之一弧秒(3米)。

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