Point-spread function of the ocean color bands of the Moderate Resolution Imaging Spectroradiometer on Aqua

2010 ◽  
Vol 49 (32) ◽  
pp. 6276 ◽  
Author(s):  
Gerhard Meister ◽  
Charles R. McClain
Keyword(s):  
Point Spread Function ◽  
Ocean Color ◽  
Point Spread ◽  
Spread Function ◽  
Moderate Resolution ◽  
Resolution Imaging ◽  
Moderate Resolution Imaging Spectroradiometer

scholarly journals How big is an OMI pixel?

2016 ◽  
Author(s):  
Martin de Graaf ◽  
Holger Sihler ◽  
Lieuwe G. Tilstra ◽  
Piet Stammes
Keyword(s):  
Experimental Tests ◽  
Pixel Size ◽  
Ozone Monitoring Instrument ◽  
Imaging Spectrometer ◽  
Point Spread ◽  
Spread Function ◽  
Moderate Resolution ◽  
Resolution Imaging ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
Reflectance Measurements

Abstract. The Ozone Monitoring Instrument (OMI) is a push-broom imaging spectrometer, observing solar radiation backscattered by the Earth's atmosphere and surface. The shape of an OMI pixel is not quadrangular, which is common for scanning instruments, but rather Gaussian-shaped as light from neighbouring pixels enters the Field of View (FoV). This has consequences for pixel-area dependent applications, like cloud fraction products, and visualisation. The shape and sizes of OMI pixels were determined pre-flight by theoretical and experimental tests, but never verified after launch. In this paper the OMI point spread function (PSF) is characterised using collocated MODerate resolution Imaging Spectroradiometer (MODIS) reflectance measurements. MODIS measurements have a much higher spatial resolution than OMI measurements and spectrally overlap at 469 nm. The optimal OMI PSF was determined by finding the highest correlation between MODIS and OMI reflectances for both cloud-free and partially clouded scenes. Our results show that the semi-official OMPIXCOR product 75FOV corner coordinates accurately fix the Full Width at Half Maximum (FWHM) of a super-Gaussian PSF, when this pixel shape is assumed. The exponent of the super-Gaussian PSF is dependent on OMI pixel row number, from about n = 2 at nadir to 3.5 at the swath edges, due to the increase in pixel size. The optimal Gaussian exponent depends on scene changes between overpasses and reduces to about n = 1 for partially clouded scenes before 2008. Then, the time difference between Aqua and Aura was 15 minutes instead of 8 minutes after 2008. Between overpasses, clouds change the scene, reducing the correlation and changing the shape of the optimal overlap.

The changing point-spread function: single-molecule-based super-resolution imaging

2014 ◽  
Vol 141 (6) ◽  
pp. 577-585 ◽  
Author(s):  
Mathew H. Horrocks ◽  
Matthieu Palayret ◽  
David Klenerman ◽  
Steven F. Lee
Keyword(s):  
Single Molecule ◽  
Point Spread Function ◽  
Super Resolution ◽  
Point Spread ◽  
Spread Function ◽  
Resolution Imaging

Moderate-Resolution Imaging Spectroradiometer ocean color polarization correction

2005 ◽  
Vol 44 (26) ◽  
pp. 5524 ◽  
Author(s):  
Gerhard Meister ◽  
Ewa J. Kwiatkowska ◽  
Bryan A. Franz ◽  
Frederick S. Patt ◽  
Gene C. Feldman ◽  
...  
Keyword(s):  
Ocean Color ◽  
Polarization Correction ◽  
Moderate Resolution ◽  
Resolution Imaging ◽  
Moderate Resolution Imaging Spectroradiometer
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