EMIT L1B: At-Sensor Calibrated Radiance and Geolocation Data at 60 m

EMIT L1B At-Sensor Calibrated Radiance and Geolocation Data Version 1 provides raw, non-orthocorrected at-sensor radiance measurements from the EMIT instrument on the International Space Station. Each data granule covers approximately 75 km by 75 km and contains 285 spectral bands ranging from 381 to 2493 nanometers, along with observation geometry and geolocation information. The data is produced by NASA's Jet Propulsion Laboratory and targets sunlit regions between 52° N and 52° S latitude.

Use Cases

• Calibrating atmospheric correction models based on at-sensor radiance measurements.
• Mapping surface mineralogy in arid dust source regions based on hyperspectral signatures.
• Analyzing viewing and solar geometry for radiative transfer calculations based on observation file data.
• Projecting raw spectral data into geographic coordinates using the provided geometric lookup tables (GLT).

Strengths

• Provides high spectral resolution data with 285 bands across a 381-2493 nm range.
• Includes geometric lookup tables (GLT) for orthorectification and projection of raw data.
• Each granule covers a substantial area, nominally 75 km by 75 km at the equator.

Limitations

• A known data acquisition gap exists from September 13, 2022, through January 6, 2023.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and total dataset size are unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory

Collection Method

Collected by the EMIT imaging spectrometer instrument aboard the International Space Station.

Time Range

Coverage from instrument operation start, with a gap from September 2022 to January 2023.

Freshness

Last updated 2026-03-13 03:06:10.756160; freshness should be verified.

Geography

Sunlit regions of interest between 52° N latitude and 52° S latitude, focusing on arid dust source regions.