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16. Five to Fifteen Feet Higher: Iowa

Iowa Department of Transportation. Used by Districts to show the difference between the LiDAR collected clearance and what we had on record.
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17. Five to Fifteen Feet Lower: Iowa

Iowa Department of Transportation. Used by Districts to show the difference between the LiDAR collected clearance and what we had on record.
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20. Four-Band Aerial Photography of Iowa: Iowa, 2007

2007. Iowa Department of Natural Resources. 2007, 2009, and 2010 Four-Band Aerial Photography of Iowa Downloads include seperate CIR and color rasters of Iowa Counties flown in 2007.