Geographical Information Systems – GIS (Grade 12 NSC Matric Geography): Flashcards
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10 cards from this deck
Definition of GIS
Definition of GIS
Organised collection of computers, programmes, data & people
Three fundamental questions GIS answers
Three fundamental questions GIS answers
What is here? Where is it? How has it changed over time?
Six core components of GIS
Six core components of GIS
Hardware, Software, Data, People, Procedures, Network
Spatial data
Spatial data
Location info showing exactly where something is on Earth's surface
Attribute data
Attribute data
Describes what a feature is and its characteristics
Point features in vector data
Point features in vector data
Single coordinate pair (e.g., spot heights, buildings)
Line features in vector data
Line features in vector data
Connect 2+ coordinates (e.g., rivers, roads, walls)
Polygon features in vector data
Polygon features in vector data
Enclose areas with boundaries (e.g., farms, urban areas, dams)
Buffering in GIS
Buffering in GIS
Creates protective zones around features at specified distances
Data layering in GIS
Data layering in GIS
Combining multiple layers like stacking transparent sheets