MassDEP Wetlands (Hosted Feature Layer)

The MassDEP Wetlands service comprises two feature types, polygons (areas) and arcs (lines). The attribute codes in the polygon layer describe different types of wetland environments and the arc attributes describe line types based on adjacent polygon types or arcs defined as hydrologic connections. This map service displays the data based on the generalized categories in the POLY_CODE and ARC_CODE fields. The 2005 MassDEP Wetlands layers provide a medium-scale representation of wetland areas of the state. Wetland areas consist of open water, vegetated wetlands, and coastal landforms. The hydrologic connection arcs provide a medium scale representation of linear features (less than 50 feet wide) that appear to contain flowing water (either intermittently or perennially) and flow into, out of, or between mapped wetland polygons. Hydrologic connections may consist of rivers, streams, ditches, culverts, swales, or other water conveyance features. Please see MassGIS' metadata for more details.

马萨诸塞州环境保护部（MassDEP）湿地服务包含两种要素类型：面要素（区域）与弧段要素（线状要素）。面要素图层的属性代码用于描述不同类型的湿地环境，弧段要素的属性则基于相邻面要素类型或被定义为水文连接的弧段类型划分线状要素的类别。本地图服务依据POLY_CODE与ARC_CODE字段中的泛化分类展示数据。2005版MassDEP湿地图层以中比例尺形式呈现该州的湿地分布范围，此类湿地涵盖开放水域、植被湿地与海岸地貌三类。水文连接弧段以中比例尺形式呈现宽度小于50英尺的线状要素，此类要素通常存在间歇性或常年性流水，且水流可流入、流出已测绘的湿地面要素，或是在多片该类面要素之间流动。水文连接通道可包括河流、溪流、排水沟、涵洞、浅洼带及其他输水设施。如需了解更多细节，请参阅马萨诸塞州地理信息系统（MassGIS）的元数据文档。