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<br />0t:"11L oy_ nUun.llJUc.L Aj~U MU\)U~:-~;::" 1/\J\....; <br /> <br />:)1":' ":'''1 ~I""; <br /> <br />..JUfl-O-v_ I ;":'Ot"'Mj <br /> <br />t"'age ':Jj I <br /> <br />Work Plan <br />Page -2- <br /> <br />3.0 Anal~tical Aerotri.ltngulation <br /> <br />Full analytical aerotrial1gulation is necessary to extend control throughout project <br />photography lor the development of digital orthophoto mapping. <br /> <br />Selection of photogrammetric pvinls for control extension will be perfonned with strict <br />adherence to rigid geometric and photogrammctric principles. Measurements will be <br />made on Zeiss P-3 Planicomp analytical stcrcoplotters with di&ital superimposition and <br />VI Imaging softcopy workstations running Photo.:r software. <br /> <br />Several computer programs will be run to perform data analysis and data refmement tasks <br />prior to obtaining final results. These computer programs allow us to detect, isolate, and <br />evaluate the contribution of all measurements to the final results. <br /> <br />Following dat.a analysis and refinement, ADS will perform a simultaneous least square <br />block adjustment of all measurement.s to obtain the final results. lhe block adjustment <br />combines the mathematical constraints of the colinearity equations with' rigorous <br />statistical analysis to ensure accurate results. <br /> <br />4.0 Distit.1 Terrain Mode) (DTMl DeveJc.JDment <br /> <br />All digital teTrcrin model (DTM) files will be developed LL<ung Zeiss P-3 Planicomp <br />analytical stereoplotters and VI Imaging softcopy workstation!;~ OTM will be developed <br />using the specified breakline random point method. Profile distances will be based on the <br />elevation differential and complexity of terrain. Data points along the profIles are <br />collected as the stereoplottcr operator maintains a consistcntreference to the ground <br />surface. Ibc points arc collected as the delta elevation changes by a pre-specified amount, <br />usually equivalent to the particular mapping :>>eale, or at a disr.anee equal to a pre- <br />detennined grid spacing. <br /> <br />DTM data will be collected in a manner that will accurately depict the terrain and will <br />meet or exceed specified accuracy requirements for maps with a 2' contour intervals. <br />DTM data wi]) be provided in GeoPak format compatible with Rodriguez & Huggins, <br />Inc. ' s computer software. All files will be labeled an9 delivered on specified medium. <br /> <br />5.0 D~tal OrthoQhoto Den)opmcnt <br /> <br />The [ollowing process will be ulSed to produce digital onhophotos for the specified area: <br /> <br />1 . f)japositives are produced on high resolution transpaIalt film under "clean <br />darkroom" conditions. <br /> <br />2. The diapo~;tjves aTe scanned \]sing a calibrated photogrammetric scanner <br />to proUuce digital image files. <br /> <br />Prior to octhophoto correction, the scanned images are checked Oll a <br />workstation for complel'-"IlcsS, cleanliness, and image quality. After quality <br />is ascertained, ADS will complete the following steps using a rigorous <br />"pixel-by-pixel" computation method. <br /> <br />AERIAL DATA SERVICE, IN<:. <br />