Key Terms

geographic information system (GIS)

CGIS

discrete object view

points

lines

polygons

vector objects

vector data model

digitizing

topology

DLG

continuous field view

raster data model

grid cell

NLCD

attributes

nominal data

ordinal data

interval data

ratio data

attribute table

records

fields

join

key

metadata

Esri

Arc/Info

ArcView

ArcGIS

ArcMap

Catalog

ArcGIS Explorer

coverage

shapefile

geodatabase

QGIS