Lecture 5 Flashcards
5 steps of database mgmt sys
- reality
- info model
- rep/data model
- databases
- file structures
database
structured set of data that has a relationship to each other - > may have both spatial and non-spatial data
integrated database
regulated, org structure
non-integrated database problems (5)
- data duplicatoin
- high maintenance costs
- poor portability and sharing
- non-systematic editing
- difficult to implement standards and security features
digital database advantages (5)
- multiple access methods
- data sharing more efficient
- redundancy and costs minimized
- central control and maintenance
- efficient analysis and production of info for decision making
spatial database mgmt systems (SDMS) mgmt allows
u to create and edit databases, add metadata, and provides a graphic user interface
6 possible inputs to a GIS database
- tables
- images
- digital products
- reports
- user input
- maps
database model
rules for rep the data objects and their relationships
relational/tabular database model - linking databases allows?
creation of relationships thru linking common columns
geodatabase model
container of database files
2 parts of a geodatabase
- data types (feature classes, raster datasets, tables)
- database schema (obj and relationships -> topologies and networks)
data interoperability
being able to operate btwn diff sources - import/export diff kinds of data files/between sys
data stream
data encoding and editing
digitizing
process of capturing knowledge about a features geometry and attributes in a digital format for computer storage
metadata is needed to (4)
identify, exchange, manipulate, catalogue geospatial resources
