Skip Navigation
menu close modal
Instrument
Overview
An image

EMIT uses an advanced imaging spectrometer instrument that measures a spectrum for every point in the image. Sunlight reflected from minerals on the Earth’s surface is imaged by a telescope and spectrometer system onto a detector area array that is sensitive from the visible to short wavelength infrared portion of the electromagnetic spectrum. The EMIT dust source minerals have distinct spectral signatures in this wavelength range. Each column of the detector array records the spectrum for a sample of 1240 cross-track EMIT instrument swath. The along-track dimension of the image is built up with the forward motion of the ISS. The imaging spectrometer measured image cubes are calibrated to spectral radiance, then atmospherically corrected and analyzed to determine the mineral composition that is required to achieve the EMIT science objectives.

The Compact Wide-swath Imaging Spectrometer (CWIS) is prototype for the EMIT imaging spectrometer. CWIS demonstrated a full spectral range Dyson design imaging spectrometer operation from the visible to the short wavelength infrared portion of the spectrum.

CWIS prototype

References

  • Green, Robert O., Natalie Mahowald, Charlene Ung, David R. Thompson, Lori Bator, Matthew Bennet, Michael Bernas et al. "The Earth Surface Mineral Dust Source Investigation: An Earth Science Imaging Spectroscopy Mission." In 2020 IEEE Aerospace Conference, pp. 1-15. IEEE, 2020.
  • Li, Longlei, Natalie M. Mahowald, Ron L. Miller, Carlos Pérez García-Pando, Martina Klose, Douglas S. Hamilton, Maria Gonçalves Ageitos et al. "Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty." Atmospheric Chemistry and Physics Discussions (2020): 1-58.
  • Bradley, Christine L., Erik Thingvold, Lori B. Moore, Justin M. Haag, Nasrat A. Raouf, Pantazis Mouroulis, and Robert O. Green. "Optical design of the Earth Surface Mineral Dust Source Investigation (EMIT) imaging spectrometer." In Imaging Spectrometry XXIV: Applications, Sensors, and Processing, vol. 11504, p. 1150402. International Society for Optics and Photonics, 2020.
  • Moore, Lori B., Holly A. Bender, Christine L. Bradley, Justin M. Haag, Sander Zandbergen, Robert O. Green, and Pantazis Mouroulis. "Recent developments in tolerancing methods for imaging spectrometers." In Optical System Alignment, Tolerancing, and Verification XIII, vol. 11488, p. 114880B. International Society for Optics and Photonics, 2020.
  • Bender, Holly A., Pantazis Mouroulis, John M. Bellardo, Cole T. Gillespie, Grigory J. Heaton, Michael A. Fernandez, Nicholas N. Sizemore et al. "Snow and Water Imaging Spectrometer (SWIS): CubeSat configuration and design." In CubeSats and NanoSats for Remote Sensing II, vol. 10769, p. 107690B. International Society for Optics and Photonics, 2018.
  • Bender, Holly A., Pantazis Mouroulis, Justin Haag, Christopher D. Smith, and Byron E. Van Gorp. "Snow and water imaging spectrometer (SWIS): first alignment and characterization results." In Earth Observing Systems XXII, vol. 10402, p. 104020A. International Society for Optics and Photonics, 2017.
  • Bender, Holly A., Pantazis Mouroulis, Christopher D. Smith, Colin H. Smith, Byron E. Van Gorp, Michael L. Eastwood, and Johannes Gross. "Snow and water imaging spectrometer (SWIS): optomechanical and system design for a CubeSat-compatible instrument." In Imaging Spectrometry XX, vol. 9611, p. 961103. International Society for Optics and Photonics, 2015.
  • Van Gorp, Byron, Pantazis Mouroulis, D. W. Wilson, and R. O. Green. "Design of the compact wide swath imaging spectrometer (CWIS)." In Imaging Spectrometry XIX, vol. 9222, p. 92220C. International Society for Optics and Photonics, 2014.
  • Van Gorp, B., P. Mouroulis, D. W. Wilson, R. O. Green, J. I. Rodriguez, E. Liggett, and D. R. Thompson. "Compact wide swath imaging spectrometer (CWIS): alignment and laboratory calibration." In Imaging Spectrometry XXI, vol. 9976, p. 997605. International Society for Optics and Photonics, 2016.