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B. Acceptance/Rejection Criteria <br /> <br />There are numerous factors affecting quality that are inherent to digital orthophoto <br />production. Digital Orthophotography should not be rejected for these inherent aesthetic <br />problems, unless critical data is obscured. For example, a pressure scratch in an open <br />field would not affect the functionality of the imagery as significantly as would a lint <br />mark obscuring a private residence. <br /> <br />Six categories of image quality have been selected for evaluation based upon aesthetic <br />and spatial importance. Other quality issues of less importance or issues that are <br />automatically fixed are discussed at the end of this document. <br /> <br />1. Edge-matching <br /> <br />When mosaicking orthophotos together, it <br />is possible that the ortho rectified imagery <br />from each source photo may not precisely <br />join or geometrically edgematch to the <br />adjacent ortho rectified image. Visual <br />inspection of the imagery is performed by <br />Sanborn to ensure that features (on the <br />ground) along the seam between <br />orthophotos align within the standards set <br />by Cass County. <br /> <br />For the 6.66-foot horizontal NMAS <br />accuracy standard set for Cass County, <br />acceptable localized shifts may be seen up <br />to 6.66-pixels and meet specifications. <br /> <br />Example of poorly <br />color infrared imagery. <br /> <br />edge-matched <br /> <br />REJECT IF: <br /> · Edge-match of features is more than a 6.66-pixel shift. <br /> <br />ACCEPT IF: <br /> · Edge-match of features is a 6.66-pixel shift or less. <br /> <br />Services Agreement between The Sanborn Map Company, Inc and Cass County, North Dakota <br /> <br />11 <br /> <br /> <br />