[GRASS-user] i.atcorr for GeoEye-1 and Worldview-3

[Nick Ves]

On Fri, Jun 5, 2015 at 12:00 PM, Nikos Alexandris <nik at nikosalexandris.net>
wrote:

> * Nick Ves <vesnikos at gmail.com> [2015-06-05 11:44:18 +0300]:
>
> > ​​
> > Take note for WV3 [0] digital globe states that
> > ​​
> > "
> >  WorldView-3 addresses this problem by being the first commercial imaging
> > satellite with an atmospheric sensor as part of its payload. During image
> > capture, the WorldView-3 atmospheric sensor is designed to detect the
> > presence of clouds, aerosols and water vapor at 31 meter resolution,
> > thereby measuring the exact atmospheric conditions corresponding to every
> > recorded image [...].
> >
> > *​​DigitalGlobe has developed proprietary algorithms that use these
> > atmospheric measurements to normalize WorldView-3 imagery for
> consistency*.
> > This normalization is called atmospheric compensation, which is
> especially
> > important for information extraction, such as change detection and
> > vegetation analysis because changes
> > *​​due to the ​​atmosphere have been removed*.
> > ​
> > "
> >
> > Which seems to imply that their (of-the-shelf) products are already
> > cleaned​ from any atmospheric artistic.
> >
> > ​Further confirmation on that would I think is needed.​
> >
> >
> > [0]
> >
> https://www.digitalglobe.com/sites/default/files/DG_Pixels_to_Products_forWeb.pdf
> >
>
>
> Or, maybe it's simply still "new" and calibration wroks are still
> on-going?
>
>
​I cannot tell if its still new or its yet being callibrated, but they seem
to have shown the results of their method​ (DG - AComp) compared to FLAASH
and QUAC methods.

Check https://calval.cr.usgs.gov/wordpress/wp-content/uploads/pacifici1.pdf
to see if you can make more than me.


> See:
> <
> http://remotesensing.spiedigitallibrary.org/article.aspx?articleid=2300382
> >.
>
>
​From you above link there's this exception:

"Note that DG plans to implement a WV-3 atmospheric-model-based reflectance
correction, taking advantage of the WV-3 aerosol and water vapor CAVIS
bands; however, this correction was not available to apply to the data used
in this investigation."

If that's true and the AComp is not yet implemented to their end-user
products I don't think there's a way to atmo correct the images without
ground measurements from your part since they haven't published a spectral
responses table  (as of yet that I am aware of)




> Nikos A
>
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