Base map data

SPATIAL DATABASE

Inundation data

CR95_04
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from CENCR, digitized from 1:24,000-scale maps

Base map data

A search was made among the Corps Districts

and imported into ARC/INFO. The county boun-

and other agencies to find digital data already pro-

daries for the Mississippi River database were

cessed. Three sources of data were found for the

acquired from the ARCUSA 1:2,000,000-scale data-

seven reaches of river: the U.S. Fish and Wildlife

base (ESRI 1993). Although these data were de-

Service Environmental Management Technical

rived from a map of much smaller scale, they

Center (USFWS EMTC), Onalaska, Wisconsin, the

were included in the database for completeness.

U.S. Army Corps of Engineers District (CEMRO),

They were not used in the map making process.

Omaha, Nebraska, and the U.S. Army Corps of En-

The Mississippi River database covers all

gineers District (CENCR), Rock Island, Illinois.

1:24,000 USGS quadrangles adjacent to the river

between St. Paul, Minnesota, and Cairo, Illinois.

Illinois and Mississippi rivers

The counties listed in Table 2 are covered either

The USFWS EMTC provided data derived from

completely or partially by the database. This reach

the U.S. Geological Survey (USGS) 1:100,000-scale

of river is in UTM zones 15 and 16.

Digital Line Graphs (DLG) (USGS 1989) for the

The Illinois River database covers all 1:24,000

Mississippi River and for the Illinois River. The

USGS quadrangles adjacent to the river between

data were supplied in separate ARC/INFO cover-

Valley City, Illinois, and the confluence with the

ages for the roads, railroads and hydrography

Mississippi River. The following counties are cov-

present in the 1:24,000-scale USGS quadrangles ad-

ered either completely or partially by the data-

jacent to the two rivers. A coverage containing the

base: Calhoun, Greene, Jersey, Pike and Scott. This

boundaries of the USGS quadrangles was also sup-

reach of river is in UTM zone 15.

plied.

All coverages were received in the UTM projec-

Des Moines, Grand, Kansas, Missouri

tion for zone 15 based on the North American Da-

and Republican rivers

tum of 1927 (NAD27). At the RSGISC, all data were

CEMRO provided digital data for the Des

imported into ARC/INFO and projected into the

Moines, Grand, Kansas, Missouri and Republican

actual UTM zones based on NAD83.

rivers from the U.S. Census Bureau Topologically

The data received from the USFWS EMTC did

Integrated Geographic Encoding and Referencing

not include the county boundaries along the Mis-

(TIGER) database (U.S. Census Bureau 1991). The

sissippi and the Illinois rivers. The county bound-

data in the 1990 TIGER/Line files are based on the

aries for the Illinois River database were acquired

USGS 1:100,000-scale maps and the Census Bur-

eau's 1980 GBF/DIME files. ARC/INFO coverages

for county boundaries, roads, railroads and

Table 2. Counties along the Mississippi River

covered completely or partially by the spatial da-

hydrography were supplied by CEMRO for each

tabase.

county along the rivers.

CEMRO extracted the coverages from the

Minnesota

Missouri

Illinois

Wisconsin

TIGER/Line file database and projected the data

Carver

Cape Girardeau

Adams

Buffalo

into the State Plane (feet) coordinate system based

Dakota

Clark

Alexander

Crawford

Goodhue

Jefferson

Calhoun

Grant

on the NAD83, with the exception of the Nebraska

Hennepin

Lewis

Carroll

LaCrosse

counties, which were left in NAD27. At the RS-

Houston

Lincoln

Hancock

Pepin

GISC, all data were imported into ARC/INFO and

Ramsey

Marion

Henderson

Pierce

projected into the UTM coordinate system.

Scott

Mississippi

Jackson

St. Croix

The Missouri River database covers 46 counties

Wabasha

Perry

Jersey

Trempealeau

Washington

Pike

Jo Daviess

Vernon

between Sioux City, Iowa, and the confluence

Winona

Ralls

Madison

with the Mississippi River near St. Louis, Missouri

Scott

Mercer

(Table 3). This reach of river is in UTM zones 14

St. Charles

Monroe

Iowa

and 15.

Allamake

St. Francois

Pike

The Des Moines River database covered the fol-

Clayton

St. Louis

Pulaski

Clinton

St. Louis City

Randolph

lowing counties between Boone, Iowa, and St.

Des Moines

Ste. Genevieve

Rock Island

Louis, Missouri: Boone, Dallas, Davis, Lee, Ma-

Dubuque

St. Clair

haska, Marion, Polk, Van Buren, Wapello and

Jackson

Union

Kentucky

Warren. The region is in UTM zone 15.

Lee

Ballard

Whiteside

The Kansas River database covers the follow-

Louisa

Carlisle

Muscatine

ing Kansas counties: Douglas, Geary, Jackson, Jef-

Scott

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