OC 1990 BW 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><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;'><br /></span></div>The 1990 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 1990 was flown of an altitude of 1&quot;=1000'.使用本网站或其中的内容，即表示您同意<a href="https://www.oakgov.com/open-data-terms" rel="nofollow ugc">使用条款</a>。 本1990年历史正射影像（Orthoimagery）数据源自传统正射摄影技术。影像采用栅格（raster）格式存储。原始胶片负片经清洁、扫描后，由扫描结果制作得到反转片。数字文件最初存储于DLT磁带之上。随后文件被上传至工作站进行影像纠正与拼接处理，并借助ERDAS Imagine Orthobase软件生成覆盖全县域的无缝影像。本次处理过程中使用了1997年拍摄的高程数据。原始1990年影像的拍摄比例尺为1英寸对应1000英尺（1"=1000'）。