This set of GIS Multiple Choice Questions & Answers (MCQs) focuses on “Raster Data Representation”.
1. In raster representation, the terrain is divided into a number of:
a) parcels
b) blocks
c) classes
d) places
View Answer
Explanation: In raster representation, the terrain is divided into a number of parcels or quantised the space into units.
2. Raster data structures do not provide precise locational information because geographic space is now divided into discrete grids. True or false?
a) True
b) False
View Answer
Explanation: Geographic space is now divided into discrete grids, as much as we divide a checkerboard into uniform squares. Instead of representing points with their absolute locations, they are represented as a single grid cell.
3. What is a parcel?
a) Element
b) Blocks
c) Grid Cell
d) Square
View Answer
Explanation: In raster representation, the terrain is divided into a number of parcels or quantised the space into units. A parcel or a unit is called a grid cell.
4. The coarser the resolution of the grid, the less we know about the ____ of points, lines, and areas represented by this structure.
a) relational position
b) absolute position
c) nature
d) characteristics
View Answer
Explanation: The larger the grid cell, the more land area is contained within it. It is a concept called resolution. The coarser the resolution of the grid, the less we know about the absolute position of points, lines, and areas represented by this structure.
5. Raster structures are pieced together to represent:
a) an entity
b) an object
c) a line
d) an entire area
View Answer
Explanation: Raster structures, especially square grid cells, are pieced together to represent an entire area.
6. The more irregular the area, the more stepped the appearance. True or false?
a) True
b) False
View Answer
Explanation: All points inside the area that is bounded by a close set of lines must occur within one of the grid cells to be represented as part of the same area. The more irregular the area, the more stepped the appearance.
7. Why does raster data structure seem to be rather undesirable?
a) Lack of Proper Methods
b) Lack of Accuracy
c) Lack of Absolute Locational Information
d) Lack of Clarity
View Answer
Explanation: Raster data structure may seem to be rather undesirable because of the lack of absolute locational information.
8. Which one among the following is the well-known example of raster data representation?
a) Remotely sensed data acquired by a sensor
b) A photograph
c) A drawing
d) A map
View Answer
Explanation: The relationship between the pixel used in remote sensing and the grid cell used in GIS allows data from satellites to be readily incorporated into raster-based GIS without any changes.
9. Which option is not a disadvantage of raster data representation?
a) Reduced spatial accuracy
b) Relatively easy to conceptualise
c) Decrease of the reliability of area
d) Need for large storage capacity
View Answer
Explanation: The major disadvantages of the raster data structure are a reduced spatial accuracy, decrease of the reliability of area and distance measures, and the need for large storage capacity associated with having to record every grid cell as a numerical value.
10. The ____ spatial data model is one of a family of spatial data models described as tessellations.
a) Vector
b) Raster
c) General
d) Regular
View Answer
Explanation: The raster spatial data model is one of a family of spatial data models described as tessellations (Demers, 1999).
Sanfoundry Global Education & Learning Series – GIS.
To practice all areas of GIS, here is complete set of Multiple Choice Questions and Answers.
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