Roads

Transportation layer for Trinity County, Trinity River Watershed, and select adjacent areas. Developed primarily from Cartographic Feature File coverages obtained from the US Forest Service, with most USFS roads corrected to overlay 1993 DOQQs. State highways, County roads, and most private named roads have since been corrected to recent NAIP aerial imagery. Roads are updated on an ongoing basis, with corrections through 2024 using (2023) NAIP & 1M DEM本数据集为特立尼达县（Trinity County）、特里尼蒂河流域（Trinity River Watershed）及选定的毗邻区域的交通图层。数据集主要基于从美国林务局（US Forest Service）获取的制图要素文件（Cartographic Feature File）覆盖范围构建，其中多数美国林务局道路已校正以匹配1993年数字正射影像图（DOQQs）。此后，州级公路、县级道路及多数有命名的私人道路已校正以匹配最新的国家农业影像计划（NAIP）航空影像。道路数据处于持续更新状态，截至2024年的校正工作已采用2023年版国家农业影像计划影像及1米分辨率数字高程模型（1M DEM）完成。