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<br /> <br />Internuctional AERIAL MAPPING COMPANY ~~ <br />8927 International Drive • San Antonio, Texas 78216 <br />1 PHONE (512) 826-8681 <br />December 5, 1978 <br /> <br />Mr. Jim Hudgens , <br />City of LaPorte <br />P. O. Box 1115 <br />La Porte, TX <br />Dear Mr, Hudgens: <br />City Administrator <br />77571 <br />In accordance with our previous discussions we are pleased <br />to submit the following proposal for providing planimetric maps at a <br />scale of 1 "=100' . <br />We propose to initiate this project by completing aerial photo- <br />graphic coverage at a scale of 1"=500' to cover the planimetric mapping <br />area. This aerial photography will be accomplished with a 6" focal <br />length Wild RC8 precision mapping camera with 60% forward overlap <br />along flight lines and 33°/o sidelap between adjacent strips, <br />Necessary horizontal control will be established within the <br />designated mapping area to provide basic requirements for aerotri- <br />angulation to meet National Map Accuracy Standards, Traverse work <br />for establishing the required horizontal control will be completed with <br />one second optical reading theodolites and Hewlett-Packard distance <br />measuring equipment. All traverse lines will be initiated at established <br />monumented stations within the area and will be closed to similar stations <br />or completed as loops to provide for final adjustment of the completed <br />data. <br />Aerotriangulation will be accomplished on our Galileo Santoni <br />Stereocartograph utilizing glass diapositives PUGGED on our Wild <br />Transfer Device to provide a minimum of six horizontal and vertical <br />control points per photographic- model. Instrument measurements <br />resulting from these aerotriangulation operations will subsequently <br />be adjusted by a strip and block method to provide a least squares <br />adjustment of all PUGGED points to the established field control. <br />These adjustments will be accomplished by our standard aerotri- <br />angulation programs on an IBM 1620 Computer. <br />• <br />