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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 > > _______________________________________________ > cf-satellite mailing list > cf-satellite@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > >
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