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B. Water Radiometry <br /> <br />Sanborn attempts no color balancing of <br />imagery in water bodies as a standard <br />product. Different sun angles can create <br />noticeable differences in water from one <br />source photograph to another. Current <br />methodology to correct this would involve <br />pasting a uniform value over the water, <br />which degrades the original data. <br /> <br />Several orthophotos have been mosaicked <br />together here, showing varying radiometry in <br />the water. Seams have been balanced on <br />land to make the imagery seamless. <br /> <br />C. System Anomalies <br /> <br />Each computer workstation and application software package displays imagery <br />differently. The color or brightness that appears on one monitor may not be the same on a <br />different monitor. Some adjustment of this may be possible on the computer monitor <br />itself or with the software package. <br /> <br />D. Shifts along Resolution Changes <br /> <br />The border between different orthophoto resolutions will not appear seamless, as a <br />standard product. Structures that "lean" across this border may be truncated or shifted. <br />There also may be a slight but noticeable change in radiometry between resolutions. This <br />may result in a "hard line" between the resolutions. <br /> <br />E. Warped Bridges and Buildings <br /> <br />An elevated bridge creates a special aesthetic problem for digital orthophotos. Because <br />DTM data is collected along the ground, bridges are rectified to the ground, giving them a <br />distorted appearance. <br /> <br />Sanborn automatically corrects bridges by collecting DTM data for the bridge as well as <br />for the ground below. <br /> <br />Some raised structures, such as pipelines, private footbridges or boardwalks, would n6t <br />be corrected. <br /> <br />Services Agreement between The Sanborn Map Company, Inc and Cass County, North Dakota <br /> <br />17 <br /> <br /> <br />