question was so small, projection adjustments were not made. Data in this region will not be
2. Polygon topology was built for the county boundary coverages and arc topology for the
roads, hydro and rail coverages.
3. Each of the 4 features was appended into a single coverage covering all the counties using
the `poly' and `all' options for the county boundaries coverage and the `arc' and `all' options for
the remaining 3 coverages. Polygon topology for the counties coverage was reconstructed us-
4. Coverages were converted to DLG-3 Optional format using the `arcdlg' command. Just prior
to conversion, items of type integer titled `major1' and `minor1' were added to the coverages to
allow conversion of attribute information. Information was encoded into the major1 item only.
For the counties coverage, the integers correspond to county names as follows: 2 = Dundy, 3 =
Hitchcock, 4 = Red Willow, 5 = Furnas, 6 = Nuckolls, 7 = Harlan, 8 = Webster, 9 = Franklin, 10
= Washington, 11 = Republic, 12 = Jewell, 13 = Cloud, 14 = Clay, 15 = Dickinson.
Integers for the roads, hydro and rail coverages correspond to the number segment of the
CFCC classification described in the TIGER/Line reference. Road features are in classification
`A', hydro in `H' and rail in `B'.
Commercial satellite derived inundation data
Data_Set_Identity: Midwest Inundation Data Derived from Satellite Imagery
Data_Set_Description: This data set contains flood extents for river regions in UTM Zones 14, 15
and 16. Data was digitized from Landsat TM, SPOT Panchromatic, and ERS-1 SAR imagery.
Zone 14 - Omaha, NE; Sioux City, IA
Zone 15 - Boonville, MO; Burlington, IA; Chester, IL; Davenport, IA; Fulton/Hermann, MO;
Omaha, NE; St. Louis, MO; St. Joseph, MO
Zone 16 - Cairo, IL; Chester, IL
Grid_Coordinate_System: Universal Transverse Mercator
Horizontal_Datum: NAD 83
Ellipsoid: GRS 1980
Transfer_Format: DLG-3 Optional
Contact_Organization: USACE Remote Sensing/GIS Center
Contact_Person: Dr. Joyce Nagle, Civil Engineer
Contact_Mailing_Address: 72 Lyme Road, Hanover, NH 03755-1290
Contact_Telephone: (603) 646-4100
Custodial_Liability: Custodian does not assume liability
Source: ERS-1 SAR (12.5 m res; 100 km swath width):
Sioux City, IA
Landsat TM (25 m res; 185 km swath width):
St. Louis, MO
SPOT Panchromatic (10 m res; 60 km swath width):
St. Joseph, MO