GIS Module 1

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Last updated 1:49 AM on 9/23/26
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11 Terms

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Choropleth map

A thematic map that shows quantitative data of a theme for a defined area (population density)

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Azimuthal projection

Map that preserves true direction/great-circle routes from one point to anywhere else (good for planes)

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Conformal projection

Preserves angles and shapes but distorts area and distance (Mercator)

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Coordinate reference system

Full spatial reference framework for the data and how it compares to the Earth’s reality. Combines information about the datum, coordinate system, and projection

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Datum

Reference system that defines how the ellipsoid is oriented relative to the actual Earth (NAD83 WGS84)

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Ellipsoid

Mathematical model of Earth’s shape and size

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Field

Column in an attribute table

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Query

Formula to select data from a table or map based on criteria

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