Big Ten Academic Alliance Geospatial Discovery Portal

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1.
Digital Elevation Model (DEM) at 1:250,000: Illinois, 2006

Digital Elevation Model (DEM) at 1:250,000: Illinois, 2006

1994. Abert, Curtis C. This raster dataset consists of edge-matched USGS 1:250,000 DEM tiles for Illinois. Cell size is 301 feet and cell values are elevations in meters ...

2.
Digital Orthophoto Quadrangle (DOQ) Data: Illinois, 1998 - 2001

Digital Orthophoto Quadrangle (DOQ) Data: Illinois, 1998 - 2001

1998-2001. U.S. Geological Survey. This is a collection of tile-by-tile NAPP-III DOQs (1998-2001) images in MrSID format for the state of Illinois, in UTM Zones 15 and 16, NAD83. Ort...

3.
Mosaic of Des Plaines Watershed, IL/WI - TerraSource Orthorectified Imagery, 2000

Mosaic of Des Plaines Watershed, IL/WI - TerraSource Orthorectified Imagery, 2000

2000. Illinois State Geological Survey and ImageAmerica. Note: The original metadata file was written by ImageAmerica. There are a few additions by ISGS required for archival and access in the Survey's en...

4.
Mosaic of Illinois 7.5-minute Digital Raster Graphic (DRG) Images, 2003

Mosaic of Illinois 7.5-minute Digital Raster Graphic (DRG) Images, 2003

2003. Illinois State Geological Survey. This is a statewide ArcSDE Raster Mosaic of USGS DRG images of 7.5-minute topographic quadrangles occurring in Illinois. These are unmodified DRG i...

5.
NAIP Digital Orthophoto Quadrangle Data: Illinois, 2014

NAIP Digital Orthophoto Quadrangle Data: Illinois, 2014

2005. USDA-FSA-APFO Aerial Photography Field Office. This data set contains imagery from the National Agricultural Imagery Program (NAIP). NAIP acquires digital ortho imagery during the agricultural g...

6.
Statewide 30-Meter Digital Elevation Model: Illinois, 2003

Statewide 30-Meter Digital Elevation Model: Illinois, 2003

2003. Lisa Smith, Chris Goldsmith, and Donald Luman. This data set is a digital elevation model (DEM) of Illinois in ArcInfo grid format. The data are stored in UTM coordinates, using a Transverse Mer...