[GRASS-dev] Landsat 5TM pre-processing - histogram matching - problem

[Moritz Lennert]

On 07/05/15 20:06, Nikos Alexandris wrote:
> Moritz:
>> AFAIU, you could use the vibility in km instead of the aerosol optical
>> depth. i.atcorr will then calculate optical depth based on a standard
>> model. To get visibility find a meteorological station close to your
>> image and get the info for the relevant date from that station.
>
> Yes, that should do as well.
>
>> A site I find convenient for that is http://www.ogimet.com/.
>
> Thanks for the tip :-)

It might actually be interesting to explore existing web APIs for 
meteorological data. ogimet provides one[1], but I think there are 
others (e.g. Meteomanz.com [2]). Metaf2xml also seems to provide access 
to the different APIs [3].

This might allow to automagically get the visibility data from the 
nearest station for the date and time closest to image data and time.

Just an idea for someone to work on in the future...

;-)

Moritz

[1] http://www.ogimet.com/getsynop_help.phtml.en
[2] http://www.meteomanz.com/index?l=1
[3] http://metaf2xml.sourceforge.net/