> > Seems like it should be a standard cell phone camera surveying application > to compute the angular altitude of an object above the horizon and the > range of possible linear altitudes given the range of visible distances > along the azimuth.
Scott is working on this very thing :-) Kind of a photosynth for fires, plumes and other citizen-observed phenomena. -S --- -. . ..-. .. ... .... - .-- --- ..-. .. ... .... stephen.gue...@redfish.com 1600 Lena St #D1, Santa Fe, NM 87505 office: (505) 995-0206 tollfree: (888) 414-3855 mobile: (505) 577-5828 fax: (505) 819-5952 tw: @redfishgroup skype: redfishgroup gvoice: (505) 216-6226 redfish.com | simtable.com On Mon, Jun 17, 2013 at 11:48 PM, Roger Critchlow <r...@elf.org> wrote: > Searching "nasa cloud top height product" gets > http://modis-atmos.gsfc.nasa.gov/MOD06_L2/ and > http://enso.larc.nasa.gov/calipso_cloudsat/pub/journal/Minnis.etal.GRL.08.pdf > which > suggest that they're reading the temperature of the cloud tops from the IR > imagery, and that they calibrated a linear fit between temperature and > altitude cloud top using Lidar data from another satellite. > > Seems like it should be a standard cell phone camera surveying application > to compute the angular altitude of an object above the horizon and the > range of possible linear altitudes given the range of visible distances > along the azimuth. > > -- rec -- > > > On Mon, Jun 17, 2013 at 1:20 PM, Stephen Guerin < > stephen.gue...@redfish.com> wrote: > >> Roger, >> >> After seeing this, I sent a question to the quoted researcher, Scott >> Bachmeier, about his method for calculating plume height. I asked if it was >> based on from a single image using sun angle and shadows, multiple >> offset satellite images or ground triangulation His reply just came in: >> >> "I was using a Cloud Top Height product derived using POES AVHRR data. >> Actually, I fear that one of my emails was misquted: I think those numbers >> referred to the Silver fire on the following day!" >> >> Here's a NOAA page on AVHRR: >> http://www.class.ngdc.noaa.gov/data_available/avhrr/index.htm >> >> I skimmed the page but don't completely grok how height is estimated from >> the measurements. >> >> -S >> >> >> On Fri, Jun 14, 2013 at 9:19 PM, Roger Critchlow <r...@elf.org> wrote: >> >>> Here's a pyrocumulus over the Silver fire estimated at 6-7 miles (31-37 >>> thousand feet), though I don't know how he worked out the angles from >>> Wisconsin. >>> >>> >>> http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=81402&src=eorss-nh >>> >>> -- rec -- >>> >>> ============================================================ >>> FRIAM Applied Complexity Group listserv >>> Meets Fridays 9a-11:30 at cafe at St. John's College >>> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >>> >> >> >> ============================================================ >> FRIAM Applied Complexity Group listserv >> Meets Fridays 9a-11:30 at cafe at St. John's College >> to unsubscribe http://redfish.com/mailman/listinfo/friam_redfish.com >> > >
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