Regional Transportation Planning Agencies

<div style="text-align:Left;"><div><div><p><span>The RTPA polygon feature class provides California Regional Transportation Planning Agencies (RTPA) legislative boundaries, primarily for regional planning applications.</span></p><p><span>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.</span></p><p><span>*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).</span></p><p><span>Reference: CALCOG GUIDE TO REGIONAL PLANNING, AS REVISED BY SB 375 JANUARY 2009.</span></p></div></div></div>

RTPA多边形要素类提供加利福尼亚区域交通规划机构（California Regional Transportation Planning Agencies，缩写RTPA）的法定管辖边界，主要用于区域规划相关应用场景。
本次收录的加利福尼亚区域交通规划机构清单截至2014年2月有效，由区域与跨机构规划办公室交通规划处提供。除太浩湖区域规划署（Tahoe Regional Planning Agency，缩写TRPA*）外，所有RTPA的边界均与县界重合，部分RTPA的管辖范围覆盖多个县域。本要素类主要基于2010年美国人口普查的县界数据制作，未包含岛屿区域。
*TRPA实为由美国国会批准、加利福尼亚州与内华达州签订契约设立的跨州机构，受联邦法律及加州、内华达州州法管辖。TRPA的管辖范围涵盖加利福尼亚州埃尔多拉多县（El Dorado）、普莱瑟县（Placer）的部分区域，以及内华达州的两个县域。而上述两个加州县域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：《区域规划CALCOG指南》（经2009年1月SB 375法案修订）。