Concepts and Functions of

Geographic Information Systems(4/5)

MSc GIS - Alexander Mogollon Diaz

Department of Agronomy

2009

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Concepts and Functions of GIS

.PPT Topic #1 Topic #2 Topic #31 A GIS is an information

systemGIS is a technology

2 Spatial Data modelling Sources of data for geodatasets

Metadata

3 Geo-referencing Coordinate transformations

4 Database management

5 Spatial Analysis

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Functionalities of GIS

INPUT

QUERY - DISPLAY - MAP

ANALYSE

STRUCTURE

MANAGE

TRANSFORM

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Databases are managed with a DBMS

• DBMS =– DataBase Management System– Software

• Management =– Definition and update of the DB-structure– Add, remove, replace data– Secure, limit access– Retrieve specific data – Copy, ...

• MS-Access as an example – DBMS extended with computing and reporting functions

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Also gDB are managed with a DBMS

A/D conversion

Structuring

Computing functions

Other functions

Data collection Database Information System

Managed with DBMS

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polygon

line

point

TIN

categoric raster

image

lattice

Hybrid GISDBMS for geometry <> DBMS for attributes

Specific (file-based) DBMS

Standardised (relational) DBMS

Arc-InfoArcView – dBase/Access

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polygon

line

point

TIN

categoric raster

image

lattice

Integrated/Universal GIS DBMS for geometry <> DBMS for attributes

Standardised (relational) DBMS

Example: •COTS: Personal (MS-ACCESS) and Professional (ORACLE, INFORMIX, DB2, ...) geodatabases for ArcGIS•FOSS: PostGreSQL with PostGIS

Questions or remarks ?

Thank you …