Space

NASA’s CASALS Instrument Bridges Gaps in 3D Maps of Earth’s Surface

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 21/10/2026, 21:05:25 UTC.

Briefings

NASA's CASALS instrument, developed by Goddard Space Flight Center, uses a tunable seed laser and a transmission grating to steer light via wavelength rather than mechanical mirrors, creating continuous 3D topographical swaths. This design eliminates blind spots between legacy lidar tracks, reduces size and power requirements, and achieves 80% quantum efficiency for detecting weak signals. A prototype flew successfully on a King Air in November 2024, distinguishing individual tree branches at 5 km altitude, with plans to mature the technology for space missions by 2027.

Key points

• CASALS uses a fast-pulsing, tunable 'seed' laser centered at 1040 nanometers that rapidly cycles through 256 unique wavelengths to steer light via diffraction, eliminating the need for heavy motorized mirrors.
• The instrument operates at 80% quantum efficiency, converting incoming photons into electrical signals effectively, allowing it to detect measurements from darker surfaces or dense vegetation.

Context

NASA's CASALS instrument bridges gaps in 3D Earth maps by blending machine learning with an ultra-compact lidar system. Developed by Goddard Space Flight Center with support from ESTO, it aims to replace isolated lidar tracks with continuous swaths, enabling unprecedented detail in forest and terrain mapping.

Limitations

Evidence covers the CASALS instrument's design, airborne prototype performance, and development timeline up to October 2026. Specific space mission details, launch dates, and final operational capabilities remain unconfirmed as the technology is still being matured for space deployment.

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