Spectral Bands

Purpose

Describe how sensors measure different parts of the electromagnetic spectrum and how band choices shape what can be observed.

Outline

• Wavelengths, bands, and sensor response
• Visible, near-infrared, shortwave infrared, and thermal measurements
• Band combinations for visual interpretation
• Spectral signatures of vegetation, water, soil, snow, and built surfaces
• Band ratios and indices as derived measurements

Later Examples

• Comparing surface types across visible and infrared bands
• Building a false-color composite for interpretation
• Sketching the logic behind a simple vegetation index