On Monday, May 16, 2011, Jonathan Greenberg wrote: > Folks: > > I was wondering if there is a way to turn the atmosphere "off" in > r.sun, and model a top of atmosphere radiation? > > --j
Hi Jonathan, If you check out the metadata associated with the output from r.sun, you will find the following: (note the "Extraterrestrial irradiance" entry) r.info rad_beam.187 +----------------------------------------------------------------------------+ | Layer: rad_beam.187 Date: Thu Mar 24 17:17:43 2011 | | Mapset: PERMANENT Login of Creator: dylan | | Location: ca630 | | DataBase: /home/dylan/grass | | Title: ( rad_beam.187 ) | | Timestamp: none | |----------------------------------------------------------------------------| | | | Type of Map: raster Number of Categories: 255 | | Data Type: FCELL | | Rows: 1396 | | Columns: 553 | | Total Cells: 771988 | | Projection: UTM (zone 10) | | N: 4235950 S: 4221990 Res: 10 | | E: 697230 W: 691700 Res: 10 | | Range of data: min = 4492.042 max = 7758.583 | | | | Data Description: | | generated by r.sun | | | | Comments: | | ---------------------------------------------------------------- | | Day [1-365]: 187 | | Solar constant (W/m^2): 1367 | | Extraterrestrial irradiance (W/m^2): 1321.303439 | | Declination (rad): 0.396193 | | Latitude min-max(deg): 38.1250 - 38.2500 | | Sunrise time min-max (hr.): 4.72 - 4.72 | | Sunset time min-max (hr.): 19.28 - 19.28 | | Time step (hr.): 0.5000 | | Linke turbidity factor: 3.0 | | Ground albedo: 0.200 | | ----------------------------------------------------------------- | | | | r.sun -s elevin="ned10m" aspin="aspect10m" aspect=270 slopein="slope\ | | 10m" slope=0.0 lin=3.0 alb=0.2 beam_rad="rad_beam.187" day=187 step=\ | | 0.5 dist=1.0 numpartitions=1 | > -- > Jonathan A. Greenberg, PhD > Assistant Project Scientist > Center for Spatial Technologies and Remote Sensing (CSTARS) > Department of Land, Air and Water Resources > University of California, Davis > One Shields Avenue > Davis, CA 95616 > Phone: 415-763-5476 > AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307 > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user > -- Dylan E. Beaudette USDA-NRCS Soil Scientist California Soil Resource Lab http://casoilresource.lawr.ucdavis.edu/ _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user