Culverts

This dataset contains the locations of culverts collected as part of the Michigan Department of Transportation (MDOT) Transportation Asset Management System (TAMS). This inventory establishes a monitoring protocol for smaller culverts between 1 foot and 10 feet (larger culverts are inventoried in the Michigan Structure Inventory as part of the National Bridge Inspection Standards). *** DISCLAIMER This statewide trunkline culvert data is part of an ongoing data collection effort. Please be advised that this data is undergoing data review and field verification and does not yet represent a complete statewide dataset. *** Data Quality: Mapping grade (refer to Spatial Quality Index field for culvert-specific data quality rating) Coverage: Statewide Symbology: Polyline Contact: Michelle O'Neil - [e-mail] Fields: Route: Indicates route (I, M, and US routes) where the culvert is located Beneath: The type of structure beneath which the culvert is located Culvert Material: The material of which the culvert is constructed Culvert Shape: Shape of the culvert Culvert Height: Height of the culvert, in inches Culvert Width: Width of the culvert, in inches Depth of Cover: Amount of fill above the top of the culvert barrel (Yes = >5’, No = <5’) Liner: Indicates whether the culvert contains a liner Liner Material: The type of liner in the culvert Spatial Quality Index: Location accuracy of the culvert data (A = Survey Grade (3D), B = Survey Grade (2D), C = Mapping Grade, D = Informational, E = Unknown)本数据集收录了密歇根州交通部（Michigan Department of Transportation, MDOT）交通资产管理系统（Transportation Asset Management System, TAMS）采集的涵洞位置数据。本数据集为尺寸介于1英尺至10英尺的小型涵洞建立了监测规程；尺寸更大的涵洞则按照《国家桥梁检查标准（National Bridge Inspection Standards）》的要求，纳入密歇根州结构清单进行编目。 *** 免责声明 *** 本全州干线公路涵洞数据属于持续开展的数据采集工作的一部分。请注意，该数据目前仍处于审核与现场验证阶段，尚未形成完整的全州数据集。 数据质量：制图级精度（具体涵洞的数据质量评级请参见空间质量指数（Spatial Quality Index）字段） 覆盖范围：全州范围 符号体系：折线（Polyline） 联系方式：Michelle O'Neil - [e-mail] 字段说明： 1. 路线（Route）：标识涵洞所在的路线类型（包括I级公路、M级公路及美国国道） 2. 下方结构（Beneath）：涵洞所坐落的下方结构类型 3. 涵洞材质（Culvert Material）：建造涵洞所用的材料 4. 涵洞形状（Culvert Shape）：涵洞的截面形状 5. 涵洞高度（Culvert Height）：涵洞的高度，单位为英寸 6. 涵洞宽度（Culvert Width）：涵洞的宽度，单位为英寸 7. 覆土深度（Depth of Cover）：涵洞拱顶上方的填土厚度（“是”代表填土厚度＞5英尺，“否”代表填土厚度＜5英尺） 8. 内衬（Liner）：标识涵洞是否带有内衬结构 9. 内衬材质（Liner Material）：涵洞内衬的材料类型 10. 空间质量指数（Spatial Quality Index）：涵洞数据的位置精度评级（A = 测量级（3D），B = 测量级（2D），C = 制图级，D = 参考信息级，E = 未知）