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

[Margherita Di Leo]

Hi,

On Thu, Jun 4, 2015 at 2:19 PM, Moritz Lennert <mlennert at club.worldonline.be
> wrote:

> On 04/06/15 13:47, Nikos Alexandris wrote:
>
>> * Moritz Lennert <mlennert at club.worldonline.be> [2015-06-04 11:38:04
>> +0200]:
>>
>>  On 03/06/15 15:06, Markus Neteler wrote:
>>>
>>>> On Wed, Jun 3, 2015 at 6:56 AM, Kamhul Camhol <monk_purple at yahoo.com>
>>>> wrote:
>>>>
>>>>> Hello. I'm quite new with GRASS but I need to atmospherically process
>>>>> high-resolution imagery with i.atcorr. I have three images Quickbird,
>>>>> GeoEye-1 and Worldview-3 imagery of a single scene across three time
>>>>> periods. For Quickbird, I have all the data needed but basing from the
>>>>> following manual GRASS GIS manual: i.atcorr
>>>>> there appears to be no values for two required inputs for GeoEye-1 and
>>>>> Worldview-3.
>>>>>
>>>>
>>>> Yes, at time only Quickbird but not GeoEye-1 and Worldview-3 are
>>>> supported.
>>>>
>>>>  These are geometrical conditions and band. May I know if GRASS
>>>>> has updated the i.atcorr manual to include these sensors as well? Can
>>>>> I use
>>>>> the values of Worldview-2 for Worldview-3? Or is there any other way
>>>>> to do
>>>>> the atmospheric correction for these two sensors?
>>>>>
>>>>
>>>> We would be happy to add support for these sensors. We need the
>>>> spectral filter curves for that, in order to integrate them in
>>>> i.atcorr.
>>>>
>>>
>>> Do I understand correctly that you would need the numbers behind the
>>> curves in this document:
>>>
>>>
>>> https://www.digitalglobe.com/sites/default/files/DigitalGlobe_Spectral_Response_1.pdf
>>>
>>> ?
>>>
>>
>> Yes Moritz, that is very relevant!  They updated the document I think (it
>> wasn't
>> there on Summer 2013 plus a few months later -- the properties of this
>> file indicate October 2014).
>>
>
> I don't have the time to do this now, but using something like [1], it
> should be easy to quickly get an approximate dataset from the graphs in
> that document.
>
> Moritz
>
> [1] http://arohatgi.info/WebPlotDigitizer/


For GeoEye-1 the curves are here:
https://apollomapping.com/wp-content/user_uploads/2013/08/GeoEye-1_Relative_Spectral_Response.xls
see https://apollomapping.com/about-us/whitepapers



-- 
Best regards,

Dr. Margherita DI LEO
Scientific / technical project officer

European Commission - DG JRC
Institute for Environment and Sustainability (IES)
Via Fermi, 2749
I-21027 Ispra (VA) - Italy - TP 261

Tel. +39 0332 78 3600
margherita.di-leo at jrc.ec.europa.eu

Disclaimer: The views expressed are purely those of the writer and may not
in any circumstance be regarded as stating an official position of the
European Commission.
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