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Maps/GIS- 241 Spoon Watershed Map
- Thematic map of the Spoon watershed showing roads, county boundaries, and elevation changes.
- Download Options: LoRes preview | HiRes (2.41 MB) | Metadata
- 242 St. Clair County Coal Maps
- ISGS Coal Map Series. Includes mines, resources, and logs.
- 243 St. Clair County Orthophotography Data 1998-1999
- Illinois National Aerial Photography Program Digital Orthophotography quarter Quadrangle data for St. Clair County in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum.
- 244 Stack-Unit Mapping of Geologic Materials to a Depth of 15 meters
- Stack-unit maps show the distribution of earth materials vertically from the surface to a specified depth and horizontally over a specified area. They also show succession of geologic units in order of occurrence. GIS data (shapefile)
- 245 Stark County Coal Maps
- ISGS Coal Map Series. Includes mines, resources, and logs.
- 246 Stark County Orthophotography Data 1998-1999
- Illinois National Aerial Photography Program Digital Orthophotography quarter Quadrangle data for Stark County in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum.
- 247 Stephenson County Orthophotography Data 1998-1999
- Illinois National Aerial Photography Program Digital Orthophotography quarter Quadrangle data for Stephenson County in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum.
- 248 Structural Features: Polygon and Point Features
- Structural features depicted are limited to well documented, significant anticlines and domes (and the Glasford Disturbance), impact features, explosion features, Silurian reefs, and buried Precambrian hills in Illinois. GIS data (shapefile)
- 249 Surface Elevation: 30-Meter Digital Elevation Model (DEM)
- A digital elevation model (DEM) in ArcINfo grid format.
- 250 Surface Elevation: 30-Meter Shaded Relief Map
- Landforms of Illinois with a shaded relief portrayal. Derived from USGS Digital Elevation Model(DEM) data. Illustrates various Illinois landforms including glacial moraines, river valleys, glacial till plains, and bedrock structures. No attributes present. ISGS, 2003. GIS data.
- 251 Surface Elevation: 301-Foot Digital Elevation Model (DEM)
- A digital elevation model (DEM) in ArcINfo grid format. GIS data (ArcInfo grid format)
- 252 Surface Elevation: 301-Foot Shaded Relief Map
- Landforms of Illinois with a shaded relief portrayal. Derived from USGS Digital Elevation Model(DEM) data. Illustrates various Illinois landforms including glacial moraines, river valleys, glacial till plains, and bedrock structures. No attributes present. ISGS, 1994. GIS data
- 253 Tazewell County Coal Maps
- ISGS Coal Map Series. Includes mines, resources, and logs.
- 254 Tazewell County Orthophotography Data 1998-1999
- Illinois National Aerial Photography Program Digital Orthophotography quarter Quadrangle data for Tazewell County in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum.
- 255 The National Map
- The National Map is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation.
- 256 Total suspended solids in the Illinois River Watershed
- Thematic map showing the mean TSS concentrations for each of the major sub-watersheds.
- Download Options: LoRes preview | HiRes (626 K) | Metadata
- 257 Tributaries in the Illinois River Watershed
- Thematic map showing the tributaries throughout the basin.
- Download Options: LoRes preview | HiRes (1.43 MB) | Metadata
- 258 Union County Orthophotography Data 1998-1999
- Illinois National Aerial Photography Program Digital Orthophotography quarter Quadrangle data for Union County in the Universal Transverse Mercator (UTM) coordinate system with a NAD83 datum.
- 259 Universal Transverse Mercator (UTM) Zones
- Shows Universal Transverse Mercator (UTM) zones in Illinois. ISGS, 2007. GIS (Shapefile).
- 260 US Geographic Names Information System (GNIS) for Illinois
- GIS (zipped shapefile). Point feature class of named places and features in Illinois. Includes place name, location, and general feature type (i.e. Populated Place, Hospital, Post Office, Reservoir, Airport, Cemetary, School). USGS 1972 to present.
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