In a GIS, the vector data model represents real-world features using
- AA hierarchical pyramid of image tiles
- BA grid of cells with numerical values
- CA continuous surface of elevation contours
- DPoints, lines and polygons with explicit coordinate geometryCorrect
Solution
Concept
Vector data model features: points, lines, polygons
Formula
Point = (x,y); Line = [(x1,y1), ...]; Polygon = closed loop
Step-by-step solution
1. Spatial data models in GIS are fundamentally divided into raster and vector models. 2. The raster model represents continuous phenomena using regular grid cells/pixels with assigned values. 3. The vector model stores discrete objects as points (single coordinates), lines (connected vertices), and polygons (closed loops). Answer: D
Explanation
In Geographic Information Systems (GIS), the vector data model represents discrete real-world features using explicit coordinate geometry composed of points, lines (arcs), and polygons. Points mark specific locations (x, y), lines represent linear entities like roads or streams, and polygons represent enclosed boundaries like parcels or lakes. Thus, option D is correct.
Why the other options are wrong
A) Image tile pyramids are multi-resolution raster display structures. B) A grid of cells with numerical values defines the raster data model. C) Continuous surface contours represent derived elevation data (DEM/TIN), not the fundamental vector model definition.
Shortcut
Vector = Points, Lines, Polygons (explicit geometry); Raster = Grid cells/pixels.
Common mistake
Confusing vector representation (explicit coordinate geometry) with raster grid cells (matrix of values).
Correct answer: D) Points, lines and polygons with explicit coordinate geometry