Train the Trainer

Which factor most critically impacts NDVI reliability during atmospheric haze?

• Sensor resolution

• Spectral confusion

• Lack of red reflectance

• Improper atmospheric correction

Why is SAR data preferred over optical data for flood mapping during monsoons?

• Higher radiometric resolution

• Independence from daylight and clouds

• Better color representation

• Enhanced edge detection

In detecting burn severity post-wildfire, which index is most suitable?

• NDVI

• SAVI

• NBR (Normalized Burn Ratio)

• NDWI

Spectral confusion between urban surfaces and bare soil is best resolved using:

• Image fusion

• Band ratio enhancement

• Panchromatic sharpening

• Histogram equalization

Mixed pixels in remote sensing are problematic because:

• They cannot be georeferenced

• They lower spatial resolution

• They contain multiple land cover types

• They are saturated by reflectance

Which technique improves land cover classification in heterogeneous areas?

• Principal Component Analysis

• Unsupervised classification

• Sub-pixel analysis

• Isodata clustering

Which index better distinguishes water in built-up areas?

• NDWI

• SAVI

• MNDWI

• NBR

What is the major source of error in inter-sensor environmental trend analysis?

• Geometric correction

• Temporal resolution

• Calibration differences

• Atmospheric distortion

What is a key advantage of hyperspectral sensors over multispectral ones?

• Lower data volume

• Better spatial resolution

• Ability to detect subtle spectral features

• Higher cost efficiency

What phenomenon makes BRDF correction essential?

• Temporal image distortion

• Directional reflectance variation

• High-temperature anomalies

• Radiometric saturation