TOMS Online Visualization and Analysis

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This is non Java/JavaScript version for TOMS EP. Click for Java/JavaScript version.
Use text input boxes below the map to specify area; maximum area is -90 ~ 90 and -180 ~ 180.

West Longitude:		North Latitude:
East Longitude:		South Latitude:

Parameters:	Column Amount Ozone UV Aerosol Index Effective Surface Reflectivity Local Noon Erythemal UV Irradiance
Plot Type:	Lat-Lon Map, Time-averaged Time Series, Area-averaged Animation, Lat-Lon Maps Time-Lon Hovmoller, Lat-averaged Time-Lat Hovmoller, Lon-averaged
Display Option: (Not for Time Series)	Grid Fill Shaded Combination
Projection:	Cylindrical Equidistant South Polar Stereo North Polar Stereo Robinson
Begin Year:	1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Month: January February March April May June July August September October November December Day: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31     (Data Begin: 1996/07/25)
End Year:	1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Month: January February March April May June July August September October November December Day: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31     (Data   End: 2005/12/31)
	Check Dates when TOMS EP Data are not available
Color Options:	Pre-defined Dynamic Customized (linear only): Min Max
Time Plot Y-Axis Options:	Dynamic Customized: Min Max Interval
Spatial Subsampling Interval: (for ASCII output only)	Original 2 3 4 5

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Data Description

Earth Probe TOMS Daily Global 1.0°x1.25° Products

The EP-TOMS Level-3 global gridded TOMS data set (new version-8) on the 1.0°x1.25° degree grids used here are produced by the NASA TOMS Science Team. The EP-TOMS data set covers the data period from July 25, 1996 to Dec. 31, 2005. The data is transformed from the original scaled numbers to physical quantities at GES DAAC before using it in Giovanni. The original EP-TOMS version-8 global gridded data from July 1996 to August 2003 are also available on DVD-ROM in ASCII format from the GES DISC DAAC.

WARNING: EP TOMS is experiencing calibration problem. For data beginning in year 2000, the calibration has been stabilized relative to NOAA-16 SBUV/2 in the equatorial zone. Because of continuing changes in the optical properties of the front scan mirror that are not well understood, data are showing a latitude dependent error that cannot be corrected by a simple calibration correction. The calibration appears to be stable near the equator. But by 50 degrees latitude, there is now a -2% to -4% error in TOMS, a bit larger in the northern hemisphere than in the southern hemisphere. Because of this error, data since 2002 should NOT be used for trend analysis.

Production of Earth Probe TOMS real time data and products has been suspended effective January 1, 2006. All TOMS data prior to 2006 will continue to be available, but OMI data should be used in the future.