(A) 'Size' helps in identification of objects in a photograph.
(B) 'Shadow' gives an idea about the height of an object.
(C) Shadows are shortest in the morning and after noon and the longest at noon.
(D) Shape is a visual aid, where by natural objects are generally characterised by curved or crooked lines while man made features are detected by their geometric pattern.
Choose the correct answer from the options given below :
Elements of Air Photo Interpretation
Understanding the key elements used in air photo interpretation is crucial for accurately identifying features in aerial images. These elements help analysts distinguish between different objects and landforms. Let's evaluate the given statements regarding these elements.
| Statement | Correctness | Reasoning |
|---|---|---|
| (A) 'Size' helps in identification. | Correct | Objects possess distinct sizes, either absolute or relative. This characteristic is fundamental for recognizing objects and their types. |
| (B) 'Shadow' gives an idea about height. | Correct | The length of a shadow cast by an object is directly related to the object's height and the angle of the sun. This relationship allows for height estimation. |
| (C) Shadows are shortest in the morning and after noon and the longest at noon. | Incorrect | Shadows are longest when the sun is low on the horizon (during early morning and late afternoon/evening) and shortest when the sun is directly overhead at noon. |
| (D) Shape: geometric for man-made, curved/crooked for natural. | Correct | The shape of an object is a significant visual cue. Man-made features often exhibit distinct geometric patterns (e.g., straight lines, right angles), whereas natural features typically display more irregular, curved, or crooked outlines. |
Correct Air Photo Element Statements Identified
Based on the analysis of each statement:
- Statement (A) is correct as size is a primary identifier in aerial photography.
- Statement (B) is correct because shadows provide valuable information for inferring the height of objects.
- Statement (D) is correct; the characteristic shapes help differentiate between natural and man-made features effectively.
Statement (C) is incorrect due to the misrepresentation of shadow length relative to the sun's position. Shadows are longest when the sun angle is low, not shortest.
Therefore, the statements that are correct are (A), (B), and (D).
Important Questions from Remote Sensing
Which of the following represents a circumpolar star?
For interpolation of satellite data used for monitoring dynamic changes that occur on the earth surface, the most suitable orbit for the satellite is:
A passive sensor uses:
Which of the following is NOT a function of GPS?
Which of the following is NOT a use of total station?
