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<br />Figure 5. - 5- by 5-foot control panel used as reference <br />point for aerial photography in the mapping effort. <br />standard. The evaluated maps are then sent on to the GCES office for review by the resident <br />scientist and survey experts. This review has proved to most beneficial in identifying <br />missing monuments used by the scientist and surveyors alike. Only after the topographic <br />review is submitted to the photogrammetric contractor are the digital and orthophoto <br />products produced. Both the digital and orthophoto data are checked for errors. The digital <br />product is checked against the topographic map sheets for correlation and attribution. The <br />orthophoto products are checked for any cartographic or photographic processing errors. The <br />photogrammetric contractor then corrects any problems found with either product <br />GIS Data Base <br />A GIS is an organized collection of computer hardware, software, and geographic data, <br />designed to capture, store, update, manipulate, analyze, and display all forms of <br />geographically referenced information. The output of a GIS can be both tabular and graphic. <br />The GIS software used for the GCES data base is ARCANFO. This software is also used by <br />the other cooperating resource agencies. Figure 6 is a schematic diagram illustrating the <br />8 <br />