Lecture 10: Spatial Analysis in Geographic Information Systems - Vector Operations, Exams of Agricultural engineering

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CSS 4200

Geographic Information Systems

Lecture 10: –

Announcements

• Spatial Analysis:

Vector Operations*

*Bolstad, Chap 9

Announcements

Spatial Analysis Project »

Laboratory Quizzes: 6 Oct, 27 Oct, 17 November

Prelim #1 Review: 09 October

Prelim Exam #1:

16 October

Textbook Chapters: #1-4, #7-

Textbook Questions: even, odd

Job listings; Listserves; E-mail notices

Framework

Data Acquisition

Preprocessing

2. Data Management3. Spatial Analysis and Manipulation

Data Processing

Information Output

Parcel, pond, landcover zone

Street, river, sewer

Manhole, utilitypole, elevation

Examples:

Polygon, surface,closed chain

Chain, link, spaghetti,arc, edge

node

OtherNames:

Multiple lines thathave common startand end point toform a length andwidthMany coordinatesets, especiallywhen boundariesare curved

Line with beginning andend (has length but nowidth or depth)At least two sets ofcoordinates(x

1

,y

1

),(x

2

,y

2

May have many pointsto approximatecurvature

No length, width,or depthOne coordinate set(x,y)

Graphic:Definition:

Areas

Lines

Points

Name:

Vector Components

Query

Query

Basic Statistics

Generalization/Aggregation

Dissolve

Eliminate

Some Basic Analyses

• Overlay• Proximity• Topology

Overlay

Fundamental operation

Recall manual GIS

Handled differently in vector and raster

– In vector, much of the overlay takes place in the

attribute table

Buffer

Basic proximity tool

Create one or morebuffers around featureof interest

Building block formany other analyses

Buffer Generation

Point

– Circle– Square

Line

– Line

Buffer

Polygon

– Interior– Exterior