Loudoun Imagery 2009

More Metadata In the spring of 2009, the Commonwealth of Virginia, through the Virginia Geographic Information Network Division (herein referred to as VGIN) of the Virginia Information Technologies Agency (VITA) contracted with the Sanborn Map Company to provide aerial data acquisition, ground control, aerial triangulation and development of statewide DTM and digital orthophotography data. The Virginia Base Mapping Program (VBMP) update project is divided into two collection phases: the Eastern half for Spring 2009 and the Western half for Spring 2011 with a 1,000' buffer to the state boundary. Ortho products are 1-foot resolution statewide ortho-imagery with upgrades to 6-inch resolution tiles and 3-inch resolution tiles in various regions within the project area. All data acquired in 2009 is jurisdiction based and is mostly in the eastern half of the state with upgrades requested in the western half of the state. "Imagery Courtesy of the Commonwealth of Virginia"更多元数据：2009年春季，弗吉尼亚联邦通过弗吉尼亚信息技术局（Virginia Information Technologies Agency，VITA）下属的弗吉尼亚地理信息网络部门（Virginia Geographic Information Network Division，VGIN），与桑伯恩地图公司（Sanborn Map Company）签订服务合同，委托其开展航空数据采集、地面控制、航空三角测量，以及全州数字地形模型（Digital Terrain Model，DTM）和数字正射影像数据的开发工作。弗吉尼亚基础制图计划（Virginia Base Mapping Program，VBMP）更新项目分为两个采集阶段：2009年春季覆盖州域东部区域，2011年春季覆盖西部区域，并沿州界预留1000英尺的缓冲区。正射影像产品初始分辨率为1英尺的全州正射影像，并针对项目区内多个区域升级为6英寸分辨率瓦片与3英寸分辨率瓦片。2009年采集的所有数据均按辖区划分，主要集中于该州东部区域，同时项目要求对州西部区域进行数据升级。"影像由弗吉尼亚联邦提供"