EarthProbe/TOMS
April 1999

Earth Probe Total Ozone Mapping Spectrometer (EPTOMS) was launched
July 2, 1996 and the first full day of data file generation began 
on July 25, 1996. The EarthProbe instrument has provided continuous 
data from that time until present, with the exception of a few days in 
Dec 1997 during which the satellite orbit was boosted from 500km to 750km,
and a period in late 1998 when the instrument was in Safehold.

The data and images provided in these directories are near-real-time 
products generated by the TOMS data processing system at
NASA/Goddard Space Flight Center in Greenbelt, Maryland.
Data from Earth Probe TOMS are downloaded 2 times/day and automatically
processed as received. When we have received a full day's data, both GIF 
images and ASCII data files are generated.

Information files:
 
EARTHPROBE_USERGUIDE.PDF
           Contains details about the EarthProbe/TOMS science algorithms,
           data products and data file formats. PDF format can be read 
	   by Adobe Acrobat readers. Free Adobe Acrobat software may be 
	   retreived from http://www.adobe.com.

earthprobe_data_coverage
           Contains information about data coverage, providing dates 
	   and explanations for missing data.

Data availability:

At this ftp site you will find gridded ozone, reflectivity, aerosol and
uv data in ASCII format, as well as daily images of ozone, uv, aerosol and
reflectivity data, plus additional subsets of EarthProbe data as indicated 
by the directory paths listed below.

Data files:	data/ozYYYY (YYYY=1996-1999 and still providing data)
                data/reflYYYY
                data/aiYYYY
		data/uvYYYY
                data/monthly_averages
                data/overpass 
                data/zonal_means
		
Image files:	images/global/yYYYY     ozone, YYYY=1996 >>>
                images/aerosol/yYYYY
		images/npole/yYYYY      ozone
		images/spole/yYYYY      ozone
		images/uv/yYYYY
		images/reflectivity/yYYYY                    

For more information about these files see the 1README text in the 
data and image directories.		

EarthProbe TOMS gridded ozone and reflectivity data are also available
in HDF format from the NASA/GSFC DAAC (http://daac.gsfc.nasa.gov). 

If these data are downloaded and used in publication, please give proper credit
to the NASA/GSFC TOMS Ozone Processing Team.

For more information on the Earthprobe/TOMS dataset, contact

        Dr. Richard D. McPeters
        Code 916
        NASA Goddard Space Flight Center
        Greenbelt, MD  20771
        mcpeters@wrabbit.gsfc.nasa.gov