18 Questions
What do spectral signatures primarily represent?
The spectral response of an object
What is the primary factor affecting an object's spectral reflectance?
All of the above
What is the characteristic spectral reflectance pattern of strong vegetation?
A 'peak and valley' structure
What is the term for the ratio between the irradiance and the radiant emittance of an object?
Reflectance
What is the primary cause of the valleys in the visible portion of the spectral reflectance curve for vegetation?
Pigments in plant leaves
At what wavelengths do inclines in reflectance occur in the spectral reflectance curve for vegetation?
0.65µm, 1.4µm, and 1.9µm
What is the primary reason for the low reflectance of vegetation in the red and blue regions of the electromagnetic spectrum?
Chlorophyll's strong absorption of blue and red energy
Which vegetation index is sensitive to changes in vegetation canopy water content and indicates water stress?
Land Surface Water Index (LSWI)
What is the primary advantage of atmospherically corrected vegetation indices?
They define true surface reflectance by removing atmospheric effects
Which type of vegetation index is developed from simple band ratios?
Simple, Intrinsic Indices
What is the primary purpose of the Vegetation Condition Index (VCI)?
To compare the current NDVI to the range of values observed in the same period in previous years
Which vegetation index minimizes the influence of soil brightness?
Soil Adjusted Vegetation Index (SAVI)
What is the primary application of the Vegetation Index formula (B8-B4)/(B8+B4) in MODIS data analysis?
To quantify the amount of vegetation
Which Sentinel band combination uses the combination of NIR, red, and green bands?
Color Infrared
What is the primary purpose of the Agriculture band combination in MODIS data analysis?
To monitor the health of crops
What is the main characteristic of healthy vegetation in the Color Infrared band combination?
Appears red due to high near-infrared reflection
What is the primary function of the Short-Wave Infrared band combination in MODIS data analysis?
To emphasize healthy and unhealthy vegetation
What is the color assigned to urban areas in the Color Infrared band combination?
White
Test your understanding of vegetation indices and spectral signatures in remote sensing image interpretation. Learn about the concepts and characteristics of spectral signatures and how they are used to identify objects in satellite images.
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