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

[Kamhul Camhol]

Well, it's been 4 days and it seems the US-based reseller is not keen on providing the information either or they are not allowed to do so. Perhaps it's a protocol in agreement with commercial software providers. Without access to these such as ERDAS or ENVI, I am stuck in my preprocessing.  

 


     On Friday, June 5, 2015 11:35 PM, Moritz Lennert <mlennert at club.worldonline.be> wrote:
   

 On 05/06/15 12:28, Moritz Lennert wrote:
> On 05/06/15 10:52, Nikos Alexandris wrote:
>> * Moritz Lennert <mlennert at club.worldonline.be> [2015-06-05 09:43:40 +0200]:
>>
>> ..
>>
>>>>> Maybe with a little more crowd-hunting or by someone just contacting
>>>>> DigitalGlobe we would get the table of values right away?
>>>>
>>>> I tried to contact DigitalGlobe in the past about WV2.  I did not
>>>> succeed back then.  Maybe now if someone has recently bought some WV3
>>>> imagery.
>>>
>>> Is this data confidential ? I would imagine that for DigitalGlobe it is
>>> an advantage if software can use their products, or ?
>>
>> I don't think this data is confidential. If we dig more, it must be
>> somewhere. But, as with WV2, and other sensors, when I set out to get
>> the respective numbers, I realised that it wasn't a str8 line.  For
>> example, <http://apollomapping.com/> offered these numbers in white
>> papers and excel files, while DG did not.
>>
>> Note, that commercial software did have these numbers integrated already
>> in their corresponding processing tools. And, though I haven't checked,
>> I guess there is already the option to perform conversions and
>> atmospherric corrections for WV3 imagery.
>>
>> If these data are for sale, I am in to contribute in buying them, as
>> much as I can.
>
> The problem is not only getting the data, but being allowed to integrate
> them into GPL'ed source code.
>
> I'll see if I can do the approximation from the graphs today, so that we
> already have something to start with.

Here is the data from the first graph in the document [1], i.e. visible, 
nir and pan bands. The attached graphic showing the results seems quite 
similar to the one in the document. But this is still only an 
approximation !

We still need the data for the swir bands, but I have to stop for now.

Moritz



[1] 
https://www.digitalglobe.com/sites/default/files/DigitalGlobe_Spectral_Response_1.pdf


  
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