North American Grid-Based Sampling Frame: Alaska and Canada (West half) at a 1x1km resolution
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This sampling frame is a set of grid-based finite-area frames spanning Canada, the United States, and Mexico. The grid for the United States is broken into individual...
本抽样框架为一套基于网格的有限区域框架，覆盖加拿大、美国与墨西哥。其中针对美国的网格被拆分为独立的……
