Exploring GIS concepts

2-2Introduction to ArcGIS I (for ArcView 8, ArcEditor 8, and ArcInfo 8)Copyright © 2000–2003 ESRI. All rights reserved.

Organizing spatial data

A GIS works with thematic layers of spatial data

Answer questions by comparing different layers of data

GIS functions

QueryQuery

AnalyzeAnalyze

StoreStore

DisplayDisplay

CaptureCapture

OutputOutput

Buildings

Streets

Reality

Customers

Capturing data

480585.5, 3769234.6483194.1, 3768432.3485285.8, 3768391.2484327.4, 3768565.9483874.7, 3769823.0

480585.5, 3769234.6483194.1, 3768432.3485285.8, 3768391.2484327.4, 3768565.9483874.7, 3769823.0

Hardcopy mapsHardcopy maps

GPSGPS

GISDataCoordinatesCoordinates

Digital dataDigital data

Storing data

Vector formats Discrete representations of reality

Raster formats Use square cells to model reality

Reality(A highway)

X,Y

Rows

Columns

X,Y

X,Y X,Y X,Y

Query

Identifying specific features

Identifying features based on conditions

Florida counties with a population greater than 300,000

Florida counties with a population greater than 300,000

AnalysisWhich parcels are within 50 feet of the road?

Which parcels are within 50 feet of the road?

Well type Drilled

Building owner Smith

Soil type Sandy

Well type Drilled

Building owner Smith

Soil type Sandy

ProximityProximity

OverlayOverlay

NetworkNetwork

Display

MapsGraphs

Reports

Output

Florida.mxd

DocumentDocument

InternetInternetPaper mapPaper map

GIS Data

Florida.jpg

ImageImage