ETPO2v2 global elevation data

ETOPO2v2 is a global elevation data gridded at a 2 arc-minute of latitude-longitude. ETOPO2v2 is available in both a cell-centered version, named ETOPO2v2c (pixel registered, where the cell boundaries are lines of even minutes of latitude and longitude, centered on intersections of lines of odd minutes of latitude and longitude) and a grid-centered version ETOPO2v2g (with cell boundaries defined by lines of odd minutes of latitude and longitude, meaning that cells were centered on the integer multiples of 2 minutes [even minutes] of latitude and longitude). The cell-centered grid is the authoritative version. The grid-centered version was derived from the cell-centered grid and the conversion produces slightly flattened relief.

ETOPO2v2 是一款网格分辨率为2弧分经纬度的全球高程数据集。该数据集包含两种版本：其一为像元中心版（cell-centered），命名为ETOPO2v2c，属于像素配准型数据，其格网边界为经纬度偶整分钟线，格网中心位于经纬度奇整分钟线的交点处；其二为格网中心版（grid-centered）ETOPO2v2g，其格网边界由经纬度奇整分钟线定义，即格网中心落在经纬度2分钟（偶整分钟）的整数倍位置处。像元中心版为该数据集的官方权威版本，格网中心版由像元中心版转换得到，该转换过程会使地形起伏产生轻微的扁平化效果。

搜集汇总

背景与挑战

背景概述

ETPO2v2 global elevation data是一个全球高程数据集，分辨率为2弧分，提供cell-centered和grid-centered两种版本，覆盖时间范围为1978年至2006年。