[GRASS-user] Derivation of Landsat 8 Tasseled Cap coefficients for certain scene in Grass

[Kozlova Maria]

Dear colleagues,

I attach the document containing description of one of algorithms for calculating TC coefficients.
Can it be done by Grass?
-- 
Best regards,

Maria V. Kozlova

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11.06.2015, 11:43, "Kozlova Maria" <kclo at yandex.ru>:
> Well...While I'm trying to type the algorithm step by step you may look through the following papers which can hopefully clarify the subject
> And thank you again for your support!
>
> https://disk.yandex.ru/client/disk/%D0%94%D0%BE%D0%BA%D1%83%D0%BC%D0%B5%D0%BD%D1%82%D1%8B
>
> And thank you again for your support!
> --
> Best regards,
>
> Maria V. Kozlova
>
>   /------------------------------------\
>   Information System Lab. (ISysLab)
>   State Oceanographic Institute,
>   Kropotkinsky per., 6,
>   MOSCOW, 119034,
>   RUSSIA
>   ------------------------------------
>   tel.    +7 499 246 6448
>   fax.    +7 499 246 7288
>   mailto:  kclo at yandex.ru
>   \------------------------------------/
>
> 10.06.2015, 21:58, "Kozlova Maria" <kclo at yandex.ru>:
>>  Well...
>>  While I'm trying to type the algorithm step by step you may look through the following papers which can hopefully clarify the subject
>>  And thank you again for your support!
>>
>>  --
>>  Best regards,
>>
>>  Maria V. Kozlova
>>
>>    /------------------------------------\
>>    Information System Lab. (ISysLab)
>>    State Oceanographic Institute,
>>    Kropotkinsky per., 6,
>>    MOSCOW, 119034,
>>    RUSSIA
>>    ------------------------------------
>>    tel.    +7 499 246 6448
>>    fax.    +7 499 246 7288
>>    mailto:  kclo at yandex.ru
>>    \------------------------------------/
>>
>>  10.06.2015, 14:58, "Moritz Lennert" <mlennert at club.worldonline.be>:
>>
>>>   On 10/06/15 13:18, Nikos Alexandris wrote:
>>>
>>>>    * Kozlova Maria <kclo at yandex.ru> [2015-06-10 11:48:44 +0300]:
>>>>
>>>>>    Dear colleagues,
>>>>>
>>>>>    Thank you for response.
>>>>>    a little bit later I will type the full procedure for derivation of TC coefficients.
>>>>>    PCA itself cannot be applied here as it is based only on statistical information of the image. TCT is physically based transformation and PCA is only the first step.
>>>>>    The main problem I see here is the 'soil line' which must be determined (manually or automatically) and PCA axes rotation to align 1st PCA component in accordance to the soil line.
>>>>>    Though I have to describe it in more details later...
>>>>
>>>>    This introduction <http://www.sjsu.edu/faculty/watkins/tassel.htm> looks
>>>>    good for me :-)
>>>
>>>   I don't have access to the paper used for the OLI version, but from the
>>>   abstract the authors do "just" use PCA + rotation to get a result that
>>>   is as close as possible to a direct tasselled cap transformation using
>>>   the original 1970s coefficients.
>>>
>>>   And when you run PCA on MSS images you often get quite close results to
>>>   what Kauth and Thomas arrived at through their clustering approach.
>>>
>>>   Moritz
>
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