ETOPO1, Global 1 Arc-minute Ocean Depth and Land Elevation from the US National Geophysical Data Center (NGDC)

ETOPO1 is a 1 arc-minute global relief model of Earth's surface that integrates land topography and ocean bathymetry. It was built from numerous global and regional data sets, and is available in "Ice Surface" (top of Antarctic and Greenland ice sheets) and "Bedrock" (base of the ice sheets) versions. Data are available in two grid registrations. For grid/node-registration, cells are centered on lines of latitude and longitude (21601 by 10801 cells), and for cell/pixel-registration, cell edges are along lines of latitude and longitude (21600 by 10800 cells). The grid-registered is the authoritative registration. The cell-registered is derived from the grid-registered, and the conversion produces slightly flattened relief.

ETOPO1系一套基于1弧分全球地表高程模型，整合了陆地地形和海洋深度测量数据。该模型由众多全球及区域数据集构建而成，并提供‘冰面’（南极和格陵兰冰盖顶部）以及‘基岩’（冰盖底部）两种版本。数据以两种网格注册方式提供。在网格/节点注册中，单元格位于经纬度线中心（21601 x 10801个单元格），而在单元格/像素注册中，单元格边缘沿经纬度线排列（21600 x 10800个单元格）。网格注册是权威的注册方式。单元格注册是从网格注册派生而来，转换过程中产生了轻微的起伏扁平化。