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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 includethem 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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