OC 1980 BW Image Service
收藏资源简介：
<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:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size:17px;'>. </span><br /></div><div><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size:17px;'><br /></span></div>The 1980 Historic Orthoimagery was derived from traditional orthophotography. Images will be in raster format. Original film negatives were cleaned, scanned, and diapositives were created from these scans. The digital files were stored on DLT tape. Files were uploaded to workstations for rectification and mosaicing. ERDAS Imagine Orthobase software was used to create a seamless county wide image. Elevation data from the 1997 photography was used in this process. The original 1980 was flown of an altitude of 1"=1000'.
<div>使用本网站或其站内内容，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:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size:17px;'>。</span><br /></div><div><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size:17px;'><br /></span></div><div><span style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size:17px;'>1980年历史正射影像（1980 Historic Orthoimagery）源自传统正射摄影技术。影像采用栅格格式存储。研发团队先对原始胶片负片进行清洁与扫描，再基于扫描结果生成数字化正片。上述数字文件最初存储于DLT磁带中。相关文件被上传至工作站以完成正射纠正与影像镶嵌处理。本次处理采用ERDAS Imagine Orthobase软件，生成了无缝覆盖全县域的影像产品。本次处理流程中使用了1997年航摄获取的高程数据。1980年原始航摄采用的飞行比例尺为1英寸对应1000英尺（1"=1000'）。</span></div>
