Which of the following statements with reference to raster data format is/are correct? 1. It has a simple data structure which is compatible with remote sensing imagery. 2. The relationship between cell size and number of cells is expressed as the resolution of the raster. Select the answer using the code given below.
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Correct answer
Explanation
The correct answer is C, Both 1 and 2. A raster stores the world as a grid of cells, which is simple and matches satellite images, and its cell size sets its resolution.
In a Geographic Information System, data is held in two main formats. The raster format divides an area into rows and columns of equal cells (pixels), each holding one value such as height, land cover or temperature. Because a satellite or aerial image is itself a grid of pixels, raster data is easy to store and analyse alongside remote sensing imagery. The size of each cell, and so the number of cells needed to cover an area, is called the resolution: smaller cells mean more cells and finer detail. The vector format, by contrast, uses points, lines and polygons.
A is wrong because statement 2 is also correct. B is wrong because statement 1 is also correct. D is wrong because both statements describe raster data accurately.
Exam tip: raster = grid of cells (images, elevation); vector = points, lines, polygons (roads, boundaries).
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