双变量四类地图

提示词

依据同一空间单元上两个各分为两类的已给指标及交叉结果，用2×2组合图例对应四类地图；如另附策略页，将其标为独立索引版式。

Use the supplied cross-classification of two indicators, each already divided into two classes on matching spatial units, to map four combinations through a 2×2 legend; identify any accompanying strategy sheet as a separate indexed layout.