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2013_wien_eumetsat_mfs

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Max R

on 18 April 2017

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Transcript of 2013_wien_eumetsat_mfs

True Color Images of the Earth
Created with MSG SEVIRI
M. Reuter
Human Color Vision
University of Bremen, Moments from Space
Thanks
Introduction
Results
Image Creation
See what you're
measuring
Sometimes TCIs are the measurement itself
Raising awareness of planet Earth
The Blue Marble
7.12.1972, Apollo 17
Earthrise
24.12.1968, Apollo 8
Photoreceptor cells of the human eye
Cone Cells
Color vision
7.000.000
Rod Cells
Brightness information
125.000.000
Spectral response
of cone cells
Spectral response
of SEVIRI
Spectral channels optimized for meteorological applications
Only ONE channel in the visible at 0.6µm = red!
Missing spectral
information
The "easy" solution: Compose VIS006, VIS008, and NIR016 to RGB
Different Physics -> Wrong colors!
VIS006
VIS008
NIR016
NASA's Blue Marble Next Generation
IDEA: Use BM to add missing color information
Map-Project
False Color Image
(FCI)
BM
BM
VIS006
Clouds above the
Blue Marble
Trivializing the RT:
Solving for C:
Calculating BM with clouds:
BMC
Assumptions:
BM estimates the surface color
Lambertian surfaces only
Clouds are white & Lambertian
No (explicit) aerosols
BMr and VIS006 have similar wavelength
Weighting BMr with cos estimates cloud free VIS06
Differences are due to cloud fraction C
Training a LUT
LUT
BM with clouds is only a good estimate for the true color image
Details can differ from reality:
Coastlines
Snow
Extreme Events
Training a LUT to create a statistical relation between FCI and BM with clouds
FCI
FCI
LUT
What’s missing?
Rayleigh!
Tabulated SCIATRAN
calculations estimate
Rayleigh scattering for
a black, cloud free
Earth
Finally
Modulating
Rayleigh
VIS006
VIS06 is used to have Rayleigh only above dark targets (e.g. no clouds)
Rayleigh is suppressed in the middle of the Earth disk to satisfy naive expectations
Applying the LUT
The LUT is used to convert false color images into true color images
TCI
Transparency
via alpha channel
Disk:
Limb:
Color channels:
July, 1st 2006, 15:00
Example
Full time series (2003-yesterday)

Please request free of charge images for use in scientific publications
Publication
Hurricane season, August, 28th 2010, 15:00
21.09.2012
Satellitenbilder: So dreht die Erde in den Herbst
Axel Bojanowski
Robustness
Waxing Earth, June, 14th 2006
Total solar eclipse
March, 29th 2006
Cloud Cells and Bands
The results satisfy naive expectations:
Results complement EUMETSAT's natural color RGB composite
Clouds are white or transparent
Vegetated surfaces are greenish
Deserts are sandy-colored
The ocean is dark blue to black
A narrow halo due to Rayleigh scattering is visible at the sunlit horizon
Cloud cells and cloud bands over the southern Atlantic ocean
High convective clouds and cloud shadows
Crater of the further volcano
Waw an-Namus, Libya
Von-Kármán- vortices
south-west of the Canaries
Rayleigh scattering in the atmosphere
Nile delta and the course
of the river Nile
Sahara desert dust
Ice shield of Greenland
Central European heat wave August 2013
Full transcript