Question
Which of the following substrate will have highest reflectance value ?
The correct answer is
Silt loam with 0.8% moisture.
Reflectance: Moisture and Soil Factors
Surface reflectance measures how much light a surface bounces back. For soils, key factors determining reflectance are moisture content and soil type.
Factors Affecting Reflectance
- Moisture Content: Water absorbs light energy, especially in relevant wavelengths. Increased moisture content leads to decreased reflectance. Drier surfaces reflect more light.
- Soil Type: Different soil compositions (like silt loam vs. clay) have inherent reflectance properties, but moisture usually has a stronger impact on reducing reflectance.
Option Analysis for Reflectance
To find the substrate with the highest reflectance value, we look for the one least affected by light absorption. This is primarily associated with the lowest moisture content.
- Silt loam, 20% moisture: High moisture significantly reduces reflectance.
- Clay, 36% moisture: Very high moisture drastically reduces reflectance.
- Silt loam, 0.8% moisture: Very low moisture allows for maximum reflectance.
- Clay, 2% moisture: Low moisture, but higher than option 3.
Highest Reflectance Determination
Comparing the moisture percentages, Silt loam with 0.8% moisture has the lowest value (0.8%).
Minimal moisture means less light absorption and therefore the highest surface reflectance among the given options.
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Important Questions from Remote Sensing - Teaching
- Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R). Select your answer from the codes given below :
Assertion (A) : Remote sensing is defined as the science and art of acquiring data about earth's objects from a distance without physical contact.
Reason (R) : The collection of data is only conducted by means of remote sensors installed in aircraft and satellite.
Codes: - Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R). Select your answer from the codes given below :
Assertion (A): Change detection in remote sensing is the process of identifying differences in the state of an object or phenomenon
Reason (R) : The use of GIS facilitates for digital change detection
Codes: - Most suitable spectral region for studying Urban Heat Island (UHI) effect is :
- Delineation of water - nonwater boundary in remote sensing is best done using :
- DEM (Digital Elevation Model) is best represented using :
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