Which of the following statement(s) is/are true regarding spatial resolution? (i) Spatial resolution measures the smallest distinguishable detail in an image, defined by the size of the smallest object that can be identified. (ii) Higher spatial resolution means large pixels.
- AOnly (i)Correct
- BOnly (ii)
- CBoth (i) and (ii)
- DNeither (i) nor (ii)
Solution
Concept
Spatial resolution and ground sampling distance relationship
Formula
Pixel Size (GSD) = (H / f) × detectorpitch
Step-by-step solution
1. Statement (i) is true: Spatial resolution specifies the smallest discernible detail or object size captured. 2. Statement (ii) is false: Higher spatial resolution requires smaller pixel sizes (e.g. 0.5 m pixel vs 30 m pixel). 3. Therefore, only statement (i) is correct. Answer: A
Explanation
Spatial resolution defines the smallest physical feature on the ground that can be resolved and recognized by an imaging sensor, corresponding to ground sampling distance (GSD). A higher spatial resolution means the sensor resolves smaller objects, which corresponds to smaller pixel dimensions, not large pixels. Therefore, statement (i) is true and statement (ii) is false.
Why the other options are wrong
B) Statement (i) is true and statement (ii) is false. C) Statement (ii) is false because higher resolution means smaller pixel size. D) Statement (i) is an accurate definition of spatial resolution.
Shortcut
Higher Spatial Resolution = Smaller Pixel Size = Finer Detail.
Common mistake
Associating 'higher' resolution with 'larger' pixel dimensions; higher resolution always means finer, smaller pixels.
Correct answer: A) Only (i)