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Eau Claire is a city in Chippewa and Eau Claire counties in the west-central part of the U.S. state of Wisconsin.

Located almost entirely in Eau Claire County, for which it is the county seat, the city had a population of 65,883 at the 2010 census, making it the state's ninth-largest city.

Eau Claire is the principal city of the Eau Claire, Wisconsin Metropolitan Statistical Area, which is a part of the Eau Claire-Menomonie Combined Statistical Area.

Omaha is the largest city in the state of Nebraska and the county seat of Douglas County.

Omaha is located in the Midwestern United States on the Missouri River, about north of the mouth of the Platte River.

Omaha is the anchor of the Omaha-Council Bluffs metropolitan area, which includes Council Bluffs, Iowa, across the Missouri River from Omaha.

According to the 2010 census, Omaha's population was 408,958, making it the nation's 43rd-largest city.

According to the 2014 Population Estimates, Omaha's population was 446,599.

Including its suburbs, Omaha formed the 60th-largest metropolitan area in the United States in 2013, with an estimated population of 895,151 residing in eight counties.

The Omaha-Council Bluffs-Fremont, Nebraska-IA Combined Statistical Area is 931,667, according to the U.S. Census Bureau's 2013 estimate.

There are nearly 1.3 million residents within the Greater Omaha area, comprising a 50-mile (80 km) radius of Downtown Omaha, the city's center.

Denver, officially the City and County of Denver, is the capital and most populous municipality of the U.S. state of Colorado.

Denver is in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains.

The Denver downtown district is immediately east of the confluence of Cherry Creek with the South Platte River, approximately east of the foothills of the Rocky Mountains.

Denver is nicknamed the Mile-High City because its official elevation is exactly one mile above sea level, making it the highest major city in the United States.

The 105th meridian west of Greenwich, the longitudinal reference for the Mountain Time Zone, passes directly through Denver Union Station.

San Francisco (SF) (Spanish for Saint Francis; Spanish), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California.

It is the birthplace of the United Nations.

Located at the north end of the San Francisco Peninsula, San Francisco is about in area, making it the smallest county—and the only consolidated city-county—within the state of California.

With a density of about 18,451 people per square mile (7,124 people per km2), San Francisco is the most densely settled large city (population greater than 200,000) in California and the second-most densely populated major city in the United States after New York City.

San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego, and San Jose, and the 13th-most populous city in the United States—with a census-estimated 2015 population of 864,816.

The city and its surrounding areas are known as the San Francisco Bay Area, and are a part of the larger OMB-designated San Jose-San Francisco-Oakland combined statistical area, the fifth most populous in the nation with an estimated population of 8.7 million.

A geographic information system (or GIS) is a system designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data.

The acronym GIS is sometimes used for geographic information science (GIScience) to refer to the academic discipline that studies geographic information systems and is a large domain within the broader academic discipline of geoinformatics.

What goes beyond a GIS is a spatial data infrastructure, a concept that has no such restrictive boundaries.