Sampling squares

This shapefile represents sampling units for measuring tree cover. Each sampling unit is a 150 x 150 m square. Squares were stratified to properties using a cadastral data set, such that one square represents one property. Within the sampling unit, all tree cover was digitized and categorized into tree cover types. Areas without tree cover were not digitized.本shapefile用于表征林木覆盖度测量的抽样单元。每个抽样单元均为150×150米的正方形地块。本次抽样以地籍数据集为依据按宗地分层，使每个正方形抽样单元对应一处宗地。在各抽样单元范围内，所有林木覆盖区域均被矢量化并划分为不同林木覆盖类型；无林木覆盖的区域未进行矢量化处理。