GIS Dictionary

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chi-square statistic

[statistics] A statistic used to assess how well a model fits the data. It compares categorized data with a multinomial […]

child replica

[ESRI software] In geodatabase editing, data that has been copied to a destination geodatabase during the replication process.

chord

A straight line that joins two points on a curve.

choropleth map

[cartography] A thematic map in which areas are distinctly colored or shaded to represent classed values of a particular phenomenon.

chroma

The saturation, purity, or intensity of a color.

CHUM

[navigation] Acronym for Chart Updating Manual. A document containing updates to aeronautical information, used by the U.S. military to update

circle

[Euclidean geometry] A two-dimensional geometric shape for which the distance from the center to any point on the edge is

circular arc

[Euclidean geometry] A curved line that is a section of a circle, with two vertices, one situated at each endpoint.

circular variance

[spatial statistics use for geostatistics] A measure of directional variation, on a scale from zero to one, among a set

civilian code

[GPS] The standard PRN code used by most civilian GPS receivers.

Clarke Belt

[astronomy] An orbit 22,245 miles (35,800 kilometers) above the equator in which a satellite travels at the same speed that

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