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Aerial view of the North Branch of the Chicago River, from the south, with Goose Island, near center. Early settlers named the North Branch of the Chicago River the Guarie River, or Gary's River, after a trader who may have settled the west bank of the river a short distance north of Wolf Point, at what is now Fulton Street.
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
Module:Location map/data/United States Chicago is a location map definition used to overlay markers and labels on an equirectangular projection map of Chicago. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
Module:Location map/data/United States Chicago Loop is a location map definition used to overlay markers and labels on an equirectangular projection map of Chicago Loop. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
Chicago's present natural geography is a result of the large glaciers of the Ice Age, namely the Wisconsinan Glaciation that carved out the modern basin of Lake Michigan (which formed from the glacier's meltwater). The city of Chicago itself sits on the Chicago Plain, a flat plain that was once the bottom of ancestral Lake Chicago. This plain ...
Module:Location map/data/United States Chicago metropolitan area is a location map definition used to overlay markers and labels on an equirectangular projection map of Chicago metropolitan area. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.
In cartography, a map projection is any of a broad set of transformations employed to represent the curved two-dimensional surface of a globe on a plane. [1] [2] [3] In a map projection, coordinates, often expressed as latitude and longitude, of locations from the surface of the globe are transformed to coordinates on a plane.
Latitude and longitude coordinates on maps are usually expressed in degrees. In the given forms of the formulae below, one or more values must be expressed in the specified units to obtain the correct result. Where geographic coordinates are used as the argument of a trigonometric function, the values may be expressed in any angular units ...