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Summary Of State Grants For Mine Mapping - Ohio
The Ohio Department of Natural Resources (ODNR), Division of Geological Survey (DGS), received a $52,000 mine-map digitization grant on March 1, 2004. A principal investigator was hired for this project and started work on June 14, 2004. Using GIS and imaging software, the purpose of this project was to geo-reference, rectify, mosaic, and "clean up" scanned TIFF images. Before and during the project, mine images within a 500-foot buffer zone from interstate highways, federal routes, and state routes were geo-referenced and rectified as part of the Abandoned Underground Mine Inventory and Risk Assessment (AUMIRA) project funded by the Ohio Department of Transportation (ODOT). DGS has 4,786 archived TIFF images in its possession. The U.S. Department of Interior, OSMRE created these images by converting the DGS microfilmed-mine maps into TIFF images. At the outset of the project, it was estimated that approximately 1,050 mine map images would be completed during the performance period of the grant. Two software programs were used to geo-reference, rectify, mosaic, and "clean up" scanned TIFF images: ESRI ArcGIS and Erdas Imagine. In the first step, ArcGIS is used to geo-reference and rectify the image based on similar indicators on the scanned TIFF image and in the GIS, including county/township/section boundaries and corners, crop lines, geopolitical boundaries, reference points, and cultural features. When more indicators were necessary to identify features, historic USGS topographic maps were used to identify railroads, highways, street intersections, and bridges or streams. This creates a TIFF that shows the mine workings and has geographic coordinates. Two files for each TIFF image are created during this process: a geo-referenced TIFF image of the mine workings that will be used to create the final image using Erdas Imagine, and a text file of the referenced point location and root mean square value as documentation for the points used to geo-reference the image. In the second step, Imagine is used to spatially enhance the geo-referenced and rectified image and to cut out the unneeded text and features that appear on the image including north arrows, legends, title, engineering notes, and scale. Imagine is also used to mosaic images when multiple TIFF images are needed to complete one mine. Two separate procedures exist, one for the case where one TIFF image covers an entire mine, and the other where multiple images cover a mine and require a mosaic. Of the 4,786 total mine TIFF images, the DGS geo-referenced 1,574 TIFF images for the project. An additional 1,070 images were geo-referenced for the AUMIRA project, making 2,644 the total number of mine TIFF images geo-referenced as of April 2005. The total number of mine TIFF images that still need to be geo-referenced is 2,142. Of the remaining 2,142, there are 912 mine TIFF images that are not associated with a mine polygon due to insufficient information regarding location. Thus, these images cannot be geographically placed at a location, and were not geo-referenced. So 1,230 mine TIFF images are ready and still need to be geo-referenced. Mine TIFF images for 18 counties were completed (not including areas that have mines that still need to be placed): Medina, Summit, Wayne, Stark, Holmes, Tuscarawas, Carroll, Harrison, Coshocton, Guernsey, Columbiana, Jefferson, Belmont, Noble, Washington, Muskingum, Morgan, and Athens. Twenty-four counties still have mine TIFF images that need to be geo-referenced, rectified, and cleaned up: Lawrence, Scioto, Gallia, Pike, Jackson, Vinton, Meigs, Hocking, Licking, Delaware, Cuyahoga, Lake, Geauga, Portage, Trumbull, Mahoning, Perry, Erie, Ottawa, Lucas, Allen, Preble, Butler, and Hamilton. No mine images in these counties were geo-referenced for the project. Additional details can be found on the following website: |
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