Significant Topographic Changes in the United States
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1x1-Degree Tiles
Summary statistics were also accumulated on the basis of the 1x1-degree tiles used for data management and processing. A total of 500 tiles contain topographic change polygons (see figure below), which represents over 53 percent of the conterminous United States tiles.
1x1-degree tiles that contain topographic change polygons. A total of 500 tiles contain change polygons, which represents over 53 percent of the conterminous United States tiles.