Letter Availability Feature Layer

Letter Availability Feature Layer Updated: Weekly-Sat The data was created using: Projected Coordinate System: WGS_1984_Web_Mercator_Auxiliary_Sphere Projection: Mercator_Auxiliary_Sphere字母可用性要素图层更新周期：每周六。本数据集采用以下投影参数构建：投影坐标系为WGS_1984_Web墨卡托辅助球体坐标系（WGS_1984_Web_Mercator_Auxiliary_Sphere），投影方式为墨卡托辅助球体投影（Mercator_Auxiliary_Sphere）。