Thurston Contours 2ft

Due to an ESRI bug download is not working for this data, but you can download it here. This data was created, by David Smith & Associated under contract with Thurston County, to provide the county with a means of surface modeling, water shed delineation and other terrain issues. It was developed as part of the county's aerial program. It is comprised of black and white photography from a flight flown in June of 1996. The contours are relevant as of June 1996. Two Foot Contours of Thurston County, Washington. The following accuracy information was provided by David Smith and Associates. "All accuracies are in relation to the computed aero triangulation control and intended to be as follows: Elevation values: Vertical_Coordinate_System_Definition: Vertical_Datum_Name: NGVD 1929 Altitude_System_Definition: Altitude_Resolution: 1.000000 Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Source_Scale_Denominator: 600 Type_of_Source_Media: Stereoscopic 1996 6ft pixel aerial photos.由于环境系统研究所（ESRI）存在程序漏洞，本数据集无法通过常规方式下载，但您可在此处获取该数据。本数据集由大卫史密斯联合公司（David Smith & Associates）与瑟斯顿县签订合同后制作，旨在为该县提供地表建模、流域划分及其他地形相关问题的解决方案。该数据集是该县航空测绘项目的一部分开发成果，包含1996年6月一次航空拍摄的黑白航空影像，其等高线数据的现势性截至1996年6月，为华盛顿州瑟斯顿县的2英尺等高线数据。以下精度信息由大卫史密斯联合公司提供："所有精度均基于计算得到的航空三角测量控制点，具体标准如下： 高程数值： 垂直坐标系定义： 垂直基准面名称：1929年国家大地垂直基准面 (NGVD 1929) 高程系统定义： 高程分辨率：1.000000 高程编码方法：与水平坐标一并存储的显式高程坐标 源影像比例尺分母：600 源介质类型：1996年拍摄的立体6英尺像素航空摄影影像。"