Addresses

The address point layer consists of points placed within building footprints. Since 2001, the building footprints and driveways have been GPS'd, typically within an accuracy of around 3 feet. The address number is generated on a grid based system developed by MSAG Data Consultants in 1992. The address number is created by where it's driveway intersects the road it comes off of on the address grid. The E-911 Ordinance and E-911 Guidance documents address the process for assigning addresses. The "Type" field specifies whether the address point is residential, commercial, industrial, etc.地址点图层（address point layer）由置于建筑轮廓线（building footprints）内的点位构成。自2001年起，建筑轮廓线与车道（driveways）均通过GPS测绘，定位精度通常可达约3英尺。地址编号基于MSAG数据咨询公司（MSAG Data Consultants）1992年开发的网格系统生成，其生成依据为该地址所在车道与地址网格上对应接入道路的交点位置。《E-911条例》（E-911 Ordinance）与《E-911指南》（E-911 Guidance）对地址分配流程作出了规范。"Type"字段用于标识该地址点的属性类别，如住宅、商业、工业等。