Loudoun Imagery 2011

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 was collected in Spring 2009 and the Western half was collected inSpring 2011. 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 2011 is jurisdiction based and is mostly in the western half of the state with upgrades requested in the eastern half of the state. "Imagery Courtesy of the Commonwealth of Virginia"元数据补充说明：2009年春季，弗吉尼亚联邦政府通过弗吉尼亚信息技术局（Virginia Information Technologies Agency，VITA）下设的弗吉尼亚地理信息网络分部（Virginia Geographic Information Network Division，VGIN），与桑伯恩地图公司（Sanborn Map Company）签订合同，委托其开展航空数据采集、地面控制点布设、航空三角测量，以及全州数字地形模型（Digital Terrain Model，DTM）与数字正射影像数据的开发工作。弗吉尼亚基础制图项目（Virginia Base Mapping Program，VBMP）更新工程分为两个采集阶段：东部片区于2009年春季完成数据采集，西部片区则于2011年春季完成采集。本次产出的正射影像产品为全州1英尺分辨率的正射影像，并针对项目覆盖范围内的多个区域升级为6英寸分辨率瓦片与3英寸分辨率瓦片。2011年获取的所有数据均按辖区进行组织，主要覆盖该州西部片区，而该州东部片区已提出升级需求。"影像由弗吉尼亚联邦政府提供（Imagery Courtesy of the Commonwealth of Virginia）"