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DSCOVR
scalbers
post Jan 3 2018, 09:49 PM
Post #151


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Here is our "DSCOVR Transcendance" poster from AGU, highlighting Blueturn and the Simulated Weather Imagery. The authors included Michael Boccara, Jay Herman, and Zoltan Toth.

https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/232523

https://agu.confex.com/agu/fm17/mediafile/H...anscendance.pdf


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scalbers
post Mar 1 2018, 12:20 AM
Post #152


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I've recently made some fixes to the handling of Rayleigh scattering in making simulated Earth images. This makes the simulated blue sky (over ocean areas) somewhat darker than previously. As a result less color adjustment to the DSCOVR web images is need to make a match. Hopefully this is now a more realistic color and contrast.

Attached Image


The left is simulated (ray-traced) from global 3-D weather and land surface data, right is a DSCOVR/EPIC image at the same time. If one uses the actual data from DSCOVR (instead of the RGB web images) the agreement in the darkest ocean areas improves further. In general my simulations come up a little short on the brightest cloud reflectance values, and have a blue ocean/sky component a little brighter than shows up in DSCOVR for reasons that are presently unclear.


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scalbers
post Mar 3 2018, 06:09 PM
Post #153


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Also for comparison, here is an image constructed from the DSCOVR calibrated counts data, converted to reflectance and then using my color processing algorithms to calculate the RGB values. This should be close to a true color / contrast astronaut view. The brightness is set to minimize clipping of the brightest white clouds. There's really an interesting variety of whiteness to the clouds with the deepest most opaque ones near the center being the brightest. Some additional processing would be needed to register the individual narrowband image locations better, considering the Earth's rotation.

Attached Image


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