Convert IMG Data to BIL with GDAL Scripts
Step | Description | Screenshot | ||||
1 | Obtain IMG Data | ![]() |
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The primary method for downloading The National Map (TNM) raster IMG (3D Elevation Program (3DEP) 1/9th arc-second only) type of staged products is by using the TNM Viewer (http://viewer.nationalmap.gov/viewer/). Zoom to the area of interest and then use the download data link at the top (1). Select the data search extent (2), and one or more of the raster staged products (3). This will provide a list of all the products available in that extent. Select the appropriate products and choose next to add them to the shopping cart. Once you checkout an email will be sent with URL's for downloading the staged products. Use the links provided in the email to download the data, and then unzip the resulting files on your local computer. More information on downloading data from The National Map is available at http://viewer.nationalmap.gov/help/9.0 TNM Cart Tab.htm |
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2 | Obtain USGS Raster Conversion Scripts | ![]() |
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A set of scripts for converting raster staged data is available at http://gisdata.usgs.gov/website/USGS_Raster_Conversion_Scripts.zip. These should be downloaded and unzipped locally. (These directions are part of the how to documentation in that archive.) | ||||||
3a | Option 1: Drag and Drop IMG Download Folder | ![]() |
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The GDAL_Convert_All_IMG_2_BIL.bat script takes a folder name as input and recursively scans that folder for all img files and attempts to create a BIL for each. In windows explorer when you drag and drop a folder onto a batch file, the folder path is passed as the parameter to run that batch file with. Doing this produces a BIL in that same folder as the IMG data. The resulting image(s) will have the name GDAL_IMG_2_BIL.bil. | ||||||
3b | Option 2: Run the GDAL_IMG_2_BIL.bat on the command line | ![]() |
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The GDAL_IMG_2_BIL.bat file uses a IMG file location for the first parameter which is the source to convert. This script will not recursively scan the sub-directories to find the data, so the path must point to the actual IMG file. A second parameter that is optional allows you to specify the path and name of the output IMG file.
Since the second parameter is optional, the easiest way to run this is to drag and drop the IMG file onto the batch file. The directions for using this script are presented below:
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