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Merging Contours

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I created 2' contours for all of Garrett County, MD and have them all in tiles provided to us with the LiDAR data. When I generated the contours from the 1m DEM, I was unable to do it county-wide so I broke it down into 3 regions (top right, top left, and bottom). I also have 17 of what I'm calling "groups" of tiles (screenshot) that fit into one or the other region (except for group 11 ... read on to the 3rd paragraph). I had some overlap in all the regions to be sure that I had good data covering those boundaries. This actually causes some problems when I go to merge contours back together.

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