Raster and Vector Data (Grade 11 NSC Matric Geography): Flashcards
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Practise the cards
10 cards from this deck
Raster data composition
Raster data composition
Pixels storing measured values of geographic phenomena
Source of raster data generation
Source of raster data generation
Satellite sensors and airborne equipment
Pixel size trade-off
Pixel size trade-off
Smaller = more detail but needs more memory
Single-band raster
Single-band raster
One measurement per pixel (e.g., DEM for elevation)
Multi-band raster
Multi-band raster
Multiple measurements per pixel (e.g., RGB photo has 3 bands)
Vector data representation method
Vector data representation method
Coordinates and geometric shapes
Point vector type
Point vector type
Single coordinate (x,y) for specific location
Line vector type
Line vector type
Series of connected coordinates for linear features
Polygon vector type
Polygon vector type
Closed boundary connecting coordinates to form an area
Vector features
Vector features
Geometry combined with descriptive attributes & properties