Download presentation
Presentation is loading. Please wait.
Published byAnis Thornton Modified over 9 years ago
1
GI Science Database Management Systems Nigel Trodd Coventry University
2
GIS are INFORMATION systems what is the role of databases? what do they do? how do they do it ?
3
Spatial data modelling
4
databases...... a body of related data stored in a structured manner
5
a body of unstructured dataa body of structured data
7
store & retrieve data efficiently
8
and … check integrate manipulate a D ata B ase M anagement S ystem
10
a DBMS is 'a software system with capabilities to define data and their attributes, establish relationships among data items, manipulate the data and manage the data' Stamper & Price (1990)
11
but
12
Spatial data are different Putting the G into an IS
13
how do databases store spatial data ? Spatial data = attribute + geometry / topology
15
but things are rarely simple
16
rdbms e.g. dBase MS Access Oracle 9i Codd’s laws
17
Storing spatial data: relational db
19
geodb
20
Summary data, databases, dbms, geodb database models –flat file, O-O –relational dbms tables (tuples) –linked by unique identifiers efficient storage, effective retrieval
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.