Regional Transportation Planning Agencies

The RTPA polygon feature class provides California Regional Transportation Planning Agencies (RTPA) legislative boundaries, primarily for regional planning applications. The list of California RegionalTransportation Planning Agencies is current as of February, 2014, provided by Division of Transportation Planning, Office of Regional and Interagency Planning. With the exception of Tahoe Regional Planning Agency (TRPA*), all of the RTPA boundaries follow county boundaries, some RTPA are multi-county. This feature class was created primarily based on 2010 Census county lines exclude the islands. *TRPA is actually a bi-state agency created by the U.S. Congress and a compact between California and Nevada. Federal laws and California and Nevada statutes govern it. TRPA is composed of parts of two counties in California, El Dorado and Placer, and two counties in Nevada. The portions of two California counties outside the Tahoe basin are part of the Sacramento Area Council of Governments (SACOG). Reference: CALCOG GUIDE TO REGIONAL PLANNING, AS REVISED BY SB 375 JANUARY 2009.加州区域交通规划机构（California Regional Transportation Planning Agencies，缩写RTPA）多边形要素类，提供了各RTPA的法定管辖边界，主要服务于区域规划类应用。截至2014年2月的加州RTPA名录由区域与跨部门规划办公室交通规划处编制更新。 除太浩湖区域规划署（Tahoe Regional Planning Agency，缩写TRPA*）外，所有RTPA的管辖边界均与县级行政区边界一致，部分RTPA的管辖范围覆盖多个县。该要素类的编制主要基于2010年人口普查的县级行政区界线，不含岛屿部分。 *TRPA实为跨州机构，由美国国会通过加利福尼亚州与内华达州之间的协定设立，受联邦法律以及加州和内华达州的法规管辖。TRPA的管辖范围涵盖加利福尼亚州埃尔多拉多县、普莱瑟县的部分区域，以及内华达州的两个县。上述两个加州县中位于太浩湖流域以外的部分，则隶属于萨克拉门托地区政府理事会（Sacramento Area Council of Governments，缩写SACOG）。 参考资料：《CALCOG区域规划指南》，经2009年1月SB 375法案修订。