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When a seam line between two photos comes in contact with elevated features, the effect <br />may be aesthetically displeasing. Sanborn uses sophisticated software to automatically <br />routes seam lines to avoid buildings. Forested areas and power lines, however, may be <br />impossible to avoid. <br /> <br />The seaming software selects the best source photograph to be used for an area, based on <br />terrain, camera angle, and proximity to photo center. Any further manipulation of the <br />seam line potentially degrades the imagery. Therefore seam line placement is not open to <br />review, as a standard product. <br /> <br />Power lines on either side o£ a <br />seam line. Note how elevated <br />features (trees, the power lines) <br />lean in different directions in the <br />two source photographs. This is <br />acceptable, as features on the <br />ground in this area are in their <br />true position. <br /> <br />Trees leaning in different <br />directions, with different <br />shadows from two source <br />photographs. Sanborn <br />Colorado minimizes this by <br />using the center of every <br />photo, and only taking <br />photography when conditions <br />are optimal. Some differences, <br />however, are unavoidable, and <br />therefore acceptable. <br /> <br /> 16 <br />Services Agreement beV,veen The Sanborn Map Company, Inc and Cass County, North Dakota <br /> <br /> <br />