Digital Raster Graphics

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The DRG uses a scanned image from the USGS standard series topographic map. It uses a UTM projection and georeferences the Earth.

Digital Line Graph

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The DLG uses digital vector data. It can include a wide range of factors from topography to boundaries to roads. Map features are displayed by lines, points, and areas.

Digital Orthographic Quarter-Quads

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The DOQQ is an aerial photograph that includes geometric qualities of a map. It displays true position which allows for more accurate measurement.

Digital Elevation Models

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The DEM is a digital representation of the elevation of terrains. It uses a raster format to display data. It is used often in GIS.

USGS Topo Map

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The USGS topo map displays 7.5 minutes of latitude and 7.5 minutes of longitude of a four-sided area. It includes UTM and State plane coordinates. This is a USGS topo map of an area in New Hampshire.

Bivariate choropleth map

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A bivariate map displays two variables on a map. This map shows the census of people.

Classes Choropleth Map

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Classes cloropleth maps portrays data broken down into intervals. It can be broken down into intervals using equal steps, quantile, natural breaks, or minimal variance. This map is broken down using equal steps.