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Landsat Surface Product Validation Instrumentation: The BigMAC Exercise.

Dennis Helder1, Mahesh Shrestha1, Joshua Mann1

  • 1KBR, Contractor to U.S. Geological Survey Earth Resources Observation and Science Center, Sioux Falls, SD 57030, USA.

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|April 26, 2025
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Summary
This summary is machine-generated.

The Big Multi-Agency Campaign (BigMAC) assessed technologies for validating satellite surface reflectance and temperature products. Inexpensive, autonomous radiometers showed good accuracy and deployability for operational measurements.

Keywords:
LandsatTidbiTsarableproduct validationspectrometerspecular array radiometric calibration (SPARC)surface reflectance/temperatureunmanned aircraft system (UAS)

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Area of Science:

  • Earth Observation
  • Remote Sensing
  • Geospatial Science

Background:

  • Growing demand for surface reflectance/temperature products from Earth optical imagery.
  • Challenges in validating surface product accuracy across diverse atmospheric and land surface conditions.
  • Limitations of traditional satellite calibration methods for surface product validation.

Purpose of the Study:

  • Assess current technologies for validating satellite-derived surface products, focusing on Landsat.
  • Evaluate measurement technologies for accuracy, precision, and deployability.
  • Identify viable options for operational surface reflectance and temperature measurements.

Main Methods:

  • Conducted the Big Multi-Agency Campaign (BigMAC) in August 2021, Brookings, SD.
  • Fielded and assessed various measurement technologies including handheld spectroradiometers, UAS-based radiometers, and mirror-based empirical line methods.
  • Evaluated inexpensive, long-term autonomous radiometers and thermal measurement technologies.

Main Results:

  • Handheld spectroradiometers offer high accuracy (0.01-0.02 reflectance units) but are costly.
  • UAS-based radiometers and mirror-based methods show accuracy potential but face deployment challenges.
  • Inexpensive, autonomous radiometers demonstrated good accuracy, precision, and ease of deployment.
  • Thermal measurement technologies achieved 1-2 K accuracy with some easily deployable instruments.

Conclusions:

  • Technologies are available for operational surface reflectance and temperature measurements.
  • Inexpensive, autonomous radiometers are promising for validation tasks.
  • Future improvements in measurement technologies are anticipated.