Hi Nikos, do you use MODIS/Terra Surface Reflectance Daily L2G Global 250m SIN Grid V005 http://edcdaac.usgs.gov/modis/mod09gqv5.asp MODIS/Aqua Surface Reflectance Daily L2G Global 250m SIN Grid V005 http://edcdaac.usgs.gov/modis/myd09gqv5.asp ?
Did you check the ATBD08 (Algorithm Technical Background Document)? http://modis.gsfc.nasa.gov/data/atbd/atbd_mod08.pdf But indeed - it doesn't seem to mention it. here maybe some pointers: http://scholar.google.com/scholar?q=modis+terrain+correction&hl=en&lr=&scoring=r&as_ylo=2002 Markus Nikos Alexandris wrote: > > Hi! > > Will this approach enable a correction for terrain as well? I don't see > how I can incorporate elevation data or anything relevant. > > I used the cosine correction approach which is described in GRASS-GIS in > order to correct a MODIS image. But the result is over-corrected (!) as > mentioned also in the book. > > I am looking for a practical approach in order to minimize terrain > effects in a MODIS NIR surface reflectance acquisition. The area in > which I am interested to visually identify the land cover, is > mountainous. So any correction would be of great importance. > > Thank you in advance. > > On Fri, 2007-11-30 at 15:10 -0800, Hamish wrote: >> Nikos Alexandris wrote: >> > I tried to follow the example for correction of terrain effects in a >> MODIS >> > surface reflectance NIR band >> > (...as far as I know, MODIS surface reflectance imagery is only >> corrected >> > for atmospheric effects). >> > >> > I don't get the desired results... The output is too bright from what >> one >> > would expect it to be. >> > >> > Any recommendations? >> >> I've never used it for MODIS, but you could try i.landsat.rgb to see if >> that >> helps. (it wants three 0-255 bands, it doesn't care about it being >> LANDSAT or >> not) >> >> >> Hamish >> >> >> >> >> ____________________________________________________________________________________ >> Never miss a thing. Make Yahoo your home page. >> http://www.yahoo.com/r/hs > -- > Nikos Alexandris > . > Department of Remote Sensing & Landscape Information Systems > Faculty of Forestry & Environmental Sciences, Albert-Ludwigs-University > Freiburg > . > Tel. +49 (0) 761 203 3697 / Fax. +49 (0) 761 203 3701 / Skype: > Nikos.Alexandris > . > Address: Tennenbacher str. 4, D-79106 Freiburg i. Br., Germany > > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > > -- View this message in context: http://www.nabble.com/Correction-of-terrain-effects-for-MODIS-data--tf4924201.html#a14109516 Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
