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R/all, sorry for some mis-communication. This is something really interesting for you. We have a satellite specially designed for tropical region weather phenomenon study that is LEO satellite and never sees poles. As referred by Jim sir that poes satellites scan left to right or vice versa, i would say it scanning direction is up down, perpendicular to its orbit. For more information see this link: http://smsc.cnes.fr/MEGHAT/GP_satellite.htm datasets are packed in h5 also in the way the scanning is done. and i am inquiring whether we have conventions in cf for such data sets. regards ghansham On 8/21/12, David Santek <dave.santek@xxxxxxxxxxxxx> wrote: > And, the conical scanners for microwave instruments [SSM/I, AMSR-E, > etc.].... > > Dave > > -- > Dave Santek > CIMSS/SSEC > University of Wisconsin-Madison > 1225 W. Dayton St. > Madison, WI 53706 > Phone: 608-263-7410 > > On 8/20/12 12:27 PM, Jim Biard wrote: >> Hi. >> >> The scan direction for POES-type satellites (for the AVHRR, MODIS, and >> VIIRS sensors, at any rate) is "across-track". The ground footprint >> of a scan line is hardly ever (maybe never) coincident with any >> longitude or latitude line, does not describe a straight line, and >> changes from being close to parallel with the Earth's equator at the >> ascending/descending nodes to being close to parallel with longitude >> lines at the northern/southern-most points of each orbit. The >> direction of scan can be "right-to-left" or "left-to-right" as seen >> from the satellite looking down at the Earth. >> >> The imaging satellites (SPOT, QuickBird, WorldView, Geo-Eye, etc) >> typically use push-broom sensors that don't have rotating telescopes. >> They may or may not be steerable in relation to the satellite track. >> And then there are the geo-synchronous satellites... >> >> All that just to point out that a proper vocabulary for describing >> such things is not simple, and we need to be careful not to go with a >> simplistic solution. >> >> Grace and peace, >> >> Jim >> >> Jim Biard >> Research Scholar >> Cooperative Institute for Climate and Satellites >> Remote Sensing and Applications Division >> National Climatic Data Center >> 151 Patton Ave, Asheville, NC 28801-5001 >> >> jim.biard@xxxxxxxx <mailto:jim.biard@xxxxxxxx> >> 828-271-4900 >> >> On Aug 16, 2012, at 12:39 AM, 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. >>> regards >>> Ghansham >>> _______________________________________________ >>> cf-satellite mailing list >>> cf-satellite@xxxxxxxxxxxxxxxx <mailto:cf-satellite@xxxxxxxxxxxxxxxx> >>> For list information or to unsubscribe, visit: >>> http://www.unidata.ucar.edu/mailing_lists/ >> >> >> >> _______________________________________________ >> 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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