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    <Title><![CDATA[OrthoImagery_NapaCountyTiles1973]]></Title>
    <Abstract><![CDATA[This tiled imagery service represents a snapshot of the land surface within Napa County in the year 1973. The tile cache scheme follows the ArcGIS Online Model and can be viewed down to ~ 1:283 scale. This imagery encompasses the whole of Napa County with 1 meter resolution.  Image Capture  The original aerial images were captured from June 6 - 20 of 1973 at a scale of 1:1200. There were ~1200 images captured in 5 different flights. The camera lens and type of aircraft are unknown. The Spot Index Map displaying the location of each captured aerial image was compiled and published by Harry Freese compliments of the California Pacific Title Company  Orthomosaic Creation  The 1200 original hard copy images were scanned onto a computer. Catalyst (a PCI Geometics Brand) software and algorithms were used to create the full orthomosaic. Metadata including flight path, image number, image latitude and longitude, and image scale were fed into the Catalyst software. The Catalyst software tool Coarse Alignment was ran to collect thousands of Ground Control and Tie Points. Manually collected Ground Control Points ( ~300) were also collected and added to the model. All the automatically collected points were examined and some deleted based on how they fit into the overall model. This process was repeated 4 times using the Fine Alignment tool on the last step. 1200 Orthoimages were then created by the Catalyst Software. They were generated using the model created by ground control points and tie points from the previous steps. Napa County 1993 Aerial Imagery and Napa County 2018 Digital Elevation Model were used as reference data sets. Using the Mosaic tool in the Catalyst Software, a full mosaic of the county was created from the 1200 orthoimages. This mosaic was edited to try to correct any misalignment between orthoimages that still existed. Lastly a tile cache was created from that full mosaic and published to the Napa County Enterprise Portal.  Notes  Although every effort was made to correct misalignments and offsets, there are areas in this mosaic where the orthoimages do not align perfectly with each other or with other Napa County Orthoimagery (2021, 2018, etc...)  If you have any further questions or would like to purchase a hard copy of this Orthomosaic, please contact gisstaff@countyofnapa.org.]]></Abstract>
    <KeywordList><Keyword><![CDATA[Napa County, Aerial Imagery, 1973, History ]]></Keyword></KeywordList>
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      <ContactPersonPrimary>
        <ContactPerson><![CDATA[GIS Staff]]></ContactPerson>
        <ContactOrganization><![CDATA[Napa County]]></ContactOrganization>
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      <ContactPosition><![CDATA[GIS Specialist]]></ContactPosition>
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        <PostCode><![CDATA[ ]]></PostCode>
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      <ContactVoiceTelephone><![CDATA[7072991623]]></ContactVoiceTelephone>
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      <ContactElectronicMailAddress><![CDATA[gisstaff@countyofnapa.org]]></ContactElectronicMailAddress>
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    <AccessConstraints><![CDATA[Disclaimer: This GIS data is intended to provide a visual display of data for the user's convenience. Users of this data are hereby notified that the appropriate public primary information sources should be consulted for verification of the information. Although every reasonable effort has been made to assure the accuracy of this data, the County of Napa makes no warranty, representation or guaranty as to the content, sequence, accuracy, timeliness or completeness of any of the data provided herein and explicitly disclaims any representations and warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. The County of Napa assumes no liability for any errors, omissions, or inaccuracies in the information provided regardless of how caused and assumes no liability for any decisions made or actions taken or not taken by the user of the data in reliance upon any information or data furnished hereunder. Because the GIS data provided is not warranted to be up-to-date, the user should check with the County staff for updated information.  Please read the Open Data Commons - Public Domain Dedication & License (PDDL)]]></AccessConstraints>
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