GEO 401: Geographic Information Systems
Midterm Examination | 2026/2027 Edition
Course Code: GEO 401
Course Title: Geographic Information Systems
Academic Session: 2026/2027 Edition
Instructions: Read each question carefully and select the best response. Correct answers and detailed
rationales are highlighted in green.
1. What fundamental feature distinguishes a Geographic Information System (GIS) from a
conventional Computer-Aided Design (CAD) system?
A) GIS handles 3D graphics, whereas CAD handles only 2D vector drawings.
B) GIS explicitly links spatial data (geometries) with non-spatial attribute data in a relational database
management framework.
C) CAD uses raster datasets exclusively, while GIS uses only vector point structures.
D) GIS cannot perform spatial query operations.
Rationale: The primary power of GIS lies in its integration of spatial geometry with structured relational attribute data,
allowing advanced thematic querying and spatial modeling that standard CAD lacks.
2. In vector spatial data representation, what are the three basic geometry primitives used to
represent real-world entities?
A) Points, Lines (Polylines), and Polygons.
B) Pixels, Cells, and Grids.
C) Nodes, Triangular Irregular Networks (TIN), and Rasters.
D) Ellipsoids, Geoids, and Datums.
Rationale: The vector data model uses discrete coordinate-based geometry primitives: Points (0D), Lines/Polylines
(1D), and Polygons (2D).
3. How is spatial information stored and organized in a raster data model?
A) As ordered lists of coordinate pairs connected by topological arcs.
B) As a continuous matrix or grid of equally sized square cells (pixels) containing specific attribute
values.
C) As irregular network triangles with slope and aspect values.
D) As relational tables without spatial coordinate linkages.
Rationale: Raster data models represent space continuously using a regular grid array of cells (pixels), where each
cell holds a quantitative or categorical value.
4. What is topology in vector GIS data structures?
, A) The explicit mathematical expression of spatial relationships (adjacency, connectivity, containment)
among spatial features.
B) The physical measurement of elevation relative to mean sea level.
C) The process of projecting a curved spherical Earth onto a flat map surface.
D) The conversion of raster grid cells into vector coordinate points.
Rationale: Topology defines spatial relationships between features—such as adjacency (neighboring polygons),
connectivity (connected lines), and containment—independent of coordinate geometry.
5. What geometric model represents the physical surface of the Earth as an equipotential
gravitational surface at mean sea level?
A) Oblate Spheroid.
B) Geoid.
C) Reference Ellipsoid.
D) Universal Transverse Mercator (UTM) Grid.
Rationale: The Geoid is the true physical model of Earth's surface defined by global gravity variations, approximating
global mean sea level.
6. What is a Geographic Coordinate System (GCS) based on?
A) A three-dimensional spherical surface measuring coordinates in angular units (latitude and longitude).
B) A flat two-dimensional Cartesian plane measuring coordinates in meters or feet.
C) A cylindrical projection grid system centered at the equator.
D) An irregular triangular network model.
Rationale: A Geographic Coordinate System defines locations on a 3D spherical or ellipsoidal Earth surface using
angular units of degrees (Latitude and Longitude).
7. What deformation property is explicitly preserved by a "Conformal" map projection?
A) Relative surface area across all regions.
B) Local angles and exact feature shapes over small areas.
C) True scale and distance along all directions.
D) Shortest compass bearings for ocean navigation.
Rationale: Conformal projections (e.g., Mercator) preserve local shape and angles by ensuring that perpendicular grid
intersections remain perpendicular, though area is distorted at regional scales.
8. What map projection property is maintained by an "Equal-Area" (Equivalent) projection?
A) True proportional size and area relationships across the map.
B) Precise local shapes and angular relations without distortion.
C) Straight-line directional compass bearings globally.
D) Unmodified scale across all map quadrants.
Rationale: Equal-area projections preserve relative feature surface area across the map, making them essential for
spatial density and area calculations, though shapes are distorted.
Midterm Examination | 2026/2027 Edition
Course Code: GEO 401
Course Title: Geographic Information Systems
Academic Session: 2026/2027 Edition
Instructions: Read each question carefully and select the best response. Correct answers and detailed
rationales are highlighted in green.
1. What fundamental feature distinguishes a Geographic Information System (GIS) from a
conventional Computer-Aided Design (CAD) system?
A) GIS handles 3D graphics, whereas CAD handles only 2D vector drawings.
B) GIS explicitly links spatial data (geometries) with non-spatial attribute data in a relational database
management framework.
C) CAD uses raster datasets exclusively, while GIS uses only vector point structures.
D) GIS cannot perform spatial query operations.
Rationale: The primary power of GIS lies in its integration of spatial geometry with structured relational attribute data,
allowing advanced thematic querying and spatial modeling that standard CAD lacks.
2. In vector spatial data representation, what are the three basic geometry primitives used to
represent real-world entities?
A) Points, Lines (Polylines), and Polygons.
B) Pixels, Cells, and Grids.
C) Nodes, Triangular Irregular Networks (TIN), and Rasters.
D) Ellipsoids, Geoids, and Datums.
Rationale: The vector data model uses discrete coordinate-based geometry primitives: Points (0D), Lines/Polylines
(1D), and Polygons (2D).
3. How is spatial information stored and organized in a raster data model?
A) As ordered lists of coordinate pairs connected by topological arcs.
B) As a continuous matrix or grid of equally sized square cells (pixels) containing specific attribute
values.
C) As irregular network triangles with slope and aspect values.
D) As relational tables without spatial coordinate linkages.
Rationale: Raster data models represent space continuously using a regular grid array of cells (pixels), where each
cell holds a quantitative or categorical value.
4. What is topology in vector GIS data structures?
, A) The explicit mathematical expression of spatial relationships (adjacency, connectivity, containment)
among spatial features.
B) The physical measurement of elevation relative to mean sea level.
C) The process of projecting a curved spherical Earth onto a flat map surface.
D) The conversion of raster grid cells into vector coordinate points.
Rationale: Topology defines spatial relationships between features—such as adjacency (neighboring polygons),
connectivity (connected lines), and containment—independent of coordinate geometry.
5. What geometric model represents the physical surface of the Earth as an equipotential
gravitational surface at mean sea level?
A) Oblate Spheroid.
B) Geoid.
C) Reference Ellipsoid.
D) Universal Transverse Mercator (UTM) Grid.
Rationale: The Geoid is the true physical model of Earth's surface defined by global gravity variations, approximating
global mean sea level.
6. What is a Geographic Coordinate System (GCS) based on?
A) A three-dimensional spherical surface measuring coordinates in angular units (latitude and longitude).
B) A flat two-dimensional Cartesian plane measuring coordinates in meters or feet.
C) A cylindrical projection grid system centered at the equator.
D) An irregular triangular network model.
Rationale: A Geographic Coordinate System defines locations on a 3D spherical or ellipsoidal Earth surface using
angular units of degrees (Latitude and Longitude).
7. What deformation property is explicitly preserved by a "Conformal" map projection?
A) Relative surface area across all regions.
B) Local angles and exact feature shapes over small areas.
C) True scale and distance along all directions.
D) Shortest compass bearings for ocean navigation.
Rationale: Conformal projections (e.g., Mercator) preserve local shape and angles by ensuring that perpendicular grid
intersections remain perpendicular, though area is distorted at regional scales.
8. What map projection property is maintained by an "Equal-Area" (Equivalent) projection?
A) True proportional size and area relationships across the map.
B) Precise local shapes and angular relations without distortion.
C) Straight-line directional compass bearings globally.
D) Unmodified scale across all map quadrants.
Rationale: Equal-area projections preserve relative feature surface area across the map, making them essential for
spatial density and area calculations, though shapes are distorted.
