Number of cells required to cover an area of 9 sq. km of ASTER-GDEM are __________________ (in integer).
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Correct Answer: 10000
Solution and Explanation
For ASTER-GDEM, the resolution is typically 30 m (0.03 km) per cell.
The area of one cell is: \[ \text{Area of one cell} = 0.03 \, \text{km} \times 0.03 \, \text{km} = 0.0009 \, \text{sq. km}. \] Now, to find the number of cells required to cover an area of 9 sq. km, divide the total area by the area of one cell: \[ \text{Number of cells} = \frac{9 \, \text{sq. km}}{0.0009 \, \text{sq. km}} = 10000. \] Thus, the number of cells required is 10000.
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