R/Sir
I understand that the ticket is raised for geostationary satellite.
But I can show some cases of POES where the satellite coverage is
over tropics only. and thats why satellite is scanning along the longitude
lines
and not latitude lines. I hope I am clear in communicating that.
For more information see this link:
http://smsc.cnes.fr/MEGHAT/GP_satellite.htm
regards
Ghansham
On Thu, Aug 16, 2012 at 12:48 PM, Martin Raspaud <martin.raspaud@xxxxxxx>wrote:
> On 16/08/12 06:39, ghansham sangar wrote:
> > R/Sir
> >
> > I have a query related to something scanning direction.
> > Are there any conventions in CF that denote in which direction the
> scanning
> > is happening.
> > Generally all the geostationary and POES satellites scan along the
> latitude
> > lines.
> > But there are some satellite specially designed for tropical region where
> > we see that they scan along
> > the longitude lines. Are there any ways to denote that. I think if it is
> > not there, then we should include
> > them somewhere.
>
> Hi Ghansham,
>
> I agree with you, this should be specified.
> One way to specify this in the geostationary case is to use the soon to
> be added "geostationary" projection definition (see here:
> https://cf-pcmdi.llnl.gov/trac/ticket/72 )
>
> However, this doesn't entirely solve the direction issue, as an
> instrument might scan from right to left or left to right (or both),
> which might be important to know in some cases.
>
> Maybe this could be an attribute to the data (eg "scanning_direction")
> or even a flag for the cases where several directions are used ?
>
> Ideally, one could specify the time of capture for each sample, but that
> might be overkill (and occupy unnecessary space).
>
> Best regards,
> Martin
>
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