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GIS (Geographic Information Systems), Geospatial Data: Types of GIS data

Information and links to geospatial data and inteactive mapping websites and GIS related software

What is Numeric data

numeric data set

Numeric data is statistical data which includes a geographical component or field that can be joined with vector files so the data can be queried and displayed as a layer on a map in a GIS. The most common type of numeric data is demographic data from the US Census.

What is Raster data

raster data layer

Raster data is data in a .JPG, .TIF, .GIF or similar format. Items scanned using a flatbed scanner like this map are examples of raster files. Images taken with a digital camera produce these same types of files.

Layers in a GIS

Layers of a GIS

This is a schematic of the various types of layers that can be used in a GIS.

What is Vector data

polygon layer and point layer

Vector data is data that has a spatial component, or X,Y coordinates assigned to it. Vector files can contain sets of points, lines, or polygons that are referenced in a geographic space.

All Elements Together

map showing combined vector, raster and numeric data layers

Polygons (properties), lines (streets), points (trees) and raster images (air photo) are separate layers integrated into one map.