OC 2012 TC Ortho Image Service

<div>BY USING THIS WEBSITE OR THE CONTENT THEREIN, YOU AGREE TO THE <u><a href='https://www.oakgov.com/open-data-terms' rel='nofollow ugc'>TERMS OF USE</a></u><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size:17px;'>. </span><br /></div><div><br /></div>Under contract with the State of Michigan, Vexcel was contracted to produce and deliver natural Color (RGB) orthophotos for numerous areas of interest in support of Michigan's Statewide Partnership Program. Areas of interest were defined by the State. All aerial imagery was acquired using ADS direct digital sensors at an altitude sufficient for the production of digital orthophotos with a 1.0-foot or .5-foot pixel resolution as requested. Following acquisition of imagery data, survey ground control coordinates were used in-conjunction with Airborne GPS and Inertial Measurement Unit (IMU) information to establish precise spatial positioning of the image data through the process of Analytical Aero-Triangulation (AT). Upon completion of AT, the imagery was rectified to the best available digital elevation model (DEM), whether from the USGS, other high quality DEM provided by the participating government in GeoTIFF or other compatible format, or new ADS stereo imagery compiled and edited surface model using Pictovera software. The resultant rectified imagery was analyzed and radiometrically adjusted to provide the state with optimal color and tonal appearance. Manually-placed seamlines were generated to mosaic imagery from adjacent flightlines. Following mosaicking and color-balancing, multiple QA/QC processes were performed to insure optimal data quality was achieved prior to tiling the data to 5,000 by 5,000 pixel extents. All ortho tiles were clipped to an AOI shapefile (buffered to 400-meters) boundaries, as supplied by the State of Michigan. Final ortho tiles were delivered in the requested projection/units and in GeoTIFF format.

<div>使用本网站或其内含内容，即表示您同意<u><a href='https://www.oakgov.com/open-data-terms' rel='nofollow ugc'>使用条款</a></u><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size:17px;'>。</span><br /></div><div><br /></div><div>密歇根州通过合同委托Vexcel公司，为支撑全州伙伴关系计划的多个指定研究区域制作并交付天然彩色（RGB）正射影像。研究区域由密歇根州划定。所有航空影像均采用ADS直接数字传感器采集，采集高度满足按要求生成1.0英尺或0.5英尺像素分辨率数字正射影像的技术指标。影像数据采集完成后，项目组将地面控制测量坐标与机载GPS、惯性测量单元（Inertial Measurement Unit，IMU）数据相结合，通过解析空中三角测量（Analytical Aero-Triangulation，AT）流程确定影像数据的精确空间位置。解析空中三角测量完成后，将影像基于现有最优数字高程模型（Digital Elevation Model，DEM）进行正射校正；此类DEM可来自美国地质调查局（USGS）、合作政府机构提供的GeoTIFF格式或其他兼容格式的高质量DEM，亦或是使用Pictovera软件编译编辑的ADS立体影像表面模型。对校正后的影像进行分析与辐射调整，以向密歇根州提供色彩与色调效果最优的成果。通过人工绘制拼接线，实现相邻航带影像的无缝镶嵌。影像镶嵌与色彩平衡完成后，开展多轮质量保证与质量控制（Quality Assurance/Quality Control，QA/QC）流程，确保数据质量达标后，将影像裁切为5000×5000像素的瓦片。所有正射影像瓦片均按照密歇根州提供的兴趣区（Area of Interest，AOI）矢量文件（缓冲400米）的边界进行裁切。最终正射影像瓦片将按照要求的投影坐标系与单位，以GeoTIFF格式交付。</div>