Question

What are the major features of MSS (Multispectral Scanner Sensor) ? Explain.

Hint:

Think of the MSS like an old-school scanner on your desk, moving a mirror back and forth to capture the image line by line!

Answer 1

Step 1: Concept
The Multispectral Scanner (MSS) was a pioneering optical sensor flown on the early Landsat satellite series (Landsat 1-5).

Step 2: Meaning
It established the modern standard for gathering continuous Earth observation data across multiple discrete wavelength bands simultaneously.

Step 3: Analysis

• Scanning Mechanism: It operates using an oscillating mirror mechanism to sweep across the Earth's surface in a continuous side-to-side motion, a technique known as a "whiskbroom" scanner.
• Spectral Bands: It typically records data in 4 distinct spectral bands simultaneously: two in the visible spectrum (green and red) and two in the near-infrared spectrum.
• Resolution and Coverage: It has a spatial resolution of roughly 79 meters (often resampled and delivered at 60 meters) and covers a wide swath width of 185 kilometers per pass.

Step 4: Conclusion
The MSS sensor is defined by its mechanical whiskbroom scanning, specific 4-band spectral range, and its foundational role in standardizing satellite imagery. Final Answer: Major features include its oscillating mirror (whiskbroom) scanning mechanism, simultaneous data collection across 4 spectral bands (visible and NIR), and a spatial resolution of approximately 79 meters over a 185 km swath.