SJRWMD

This data layer defines the extent of the St. Johns River Water Management District. A legal description of the District boundary was used as a guide to find map features from USGS 1:24,000 scale quad maps that coincide with the District boundary. These map features were then digitized from the USGS quads. In July 1, 2003, the Polk County portion of SJRWMD was transferred to the SWFWMD, and this layer was updated to reflect the change.

本数据图层界定了圣约翰斯河水资源管理区（St. Johns River Water Management District）的管辖范围。我们以该管理区边界的法定记载为依据，从与该边界重合的美国地质调查局（USGS）1:24000比例尺标准图幅地图中筛选匹配的地图要素，随后对上述图幅中的这些要素完成数字化处理。2003年7月1日，原属圣约翰斯河水资源管理区（SJRWMD）的波尔克县辖区被划转至西南佛罗里达水资源管理区（SWFWMD），本数据图层随即进行更新以反映此次区划变更。