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This coverage outlines the boundary of the Loess Hills in Iowa at 1:100,000 scale. Criteria applied to the delineation of the Loess Hills included drainage density, drainage divides, density of isolated hillforms, crenulated contours, slopes greater than 15%, presence of catstep features, general loess thickness and earlier mapping. The following sources were utilized: 1:100,000 and 1:24,000 scale USGS topographic maps, USDA-NRCS STATSGO Soil Survey Grid Information, Digital Elevation Module, and the 1:2,000,000 Landforms of Iowa Coverage. |
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This coverage outlines the boundary of the Loess Hills in Iowa at 1:100,000 scale. Criteria applied to the delineation of the Loess Hills included drainage density, drainage divides, density of isolated hillforms, crenulated contours, slopes greater than 15%, presence of catstep features, general loess thickness and earlier mapping. The following sources were utilized: 1:100,000 and 1:24,000 scale USGS topographic maps, USDA-NRCS STATSGO Soil Survey Grid Information, Digital Elevation Module, and the 1:2,000,000 Landforms of Iowa Coverage. |
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USGS & Iowa Department of Transportation |
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5000 |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This coverage outlines the boundary of the Loess Hills in Iowa at 1:100,000 scale. Criteria applied to the delineation of the Loess Hills included drainage density, drainage divides, density of isolated hillforms, crenulated contours, slopes greater than 15%, presence of catstep features, general loess thickness and earlier mapping. The following sources were utilized: 1:100,000 and 1:24,000 scale USGS topographic maps, USDA-NRCS STATSGO Soil Survey Grid Information, Digital Elevation Module, and the 1:2,000,000 Landforms of Iowa Coverage.</SPAN></P></DIV></DIV></DIV> |
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| title:
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Loess Hills |
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["Loess Hills","USGS","Iowa DOT","Iowa Department of Transportation","Assets","Inventory"] |
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en-US |
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150000000 |
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