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Specification of the data file formats
The data used to make the images (maps) available at the website are in
general also available in some form. Both the availability and the form
depend on the satellite instrument:
See also the section on the
Presentation and delivery of the data.
Links to the relevant data files -- if available -- are given on the
web pages showing the images (maps).
SCIAMACHY based data
The SO2 data based on SCIAMACHY is delivered in two forms:
- as ASCII files for daily data at the coordinates of the measurements (at orbit coordinates)
- as HDF-4 files for daily data
(at the coordinates of a rectangular latitude-longitude grid)
The data product files mention, among others, version number (see the chapter
Process version history). They also have been
given a product status, for a quick-look indication on the status
of the data product:
| status |
description |
| Archive & NRT data |
for SO2 slant and column data delivered via the Archive Service
(ASCII and HDF data files)
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The data file structure is described on separate pages:
===> Some notes regarding downloading of
data files and images
OMI based data
The SO2 data based on OMI measurements at orbit coordinates is provided by
NASA in their HDF5-EOS format. The NRT data used for the images is not
available for download to third parties. The off-line data usually follows
2 or 3 days later and is available via the NASA website, which also gives access to a description of the (rather complex) data
format. It is also possible to contact the US team (NASA) and the Dutch team (KNMI).
It is not yet certain whether daily composites of OMI data on a
latitude-longitude grid will be made.
Monthly average data will be provided on the same grid as the SCIAMACHY
data, in the same format: HDF-4; see the links above for more information.
GOME-2 based data
The SO2 data based on GOME-2 is delivered in one form:
- as ASCII files for daily data at the coordinates of the measurements (at orbit coordinates)
| status |
description |
| Archive & NRT data |
for SO2 slant and column data delivered via the Archive Service
(ASCII and HDF data files)
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The data file structure is described on a separate page:
IASI based data
The SO2 DBT data based on IASI measurements at orbit coordinates is provided by EUMETSAT. It is also possible to contact the ULB team (Belgium).
AIRS based data
The SO2 DBT data based on AIRS measurements at orbit coordinates is provided by NASA/JPL. It is also possible to download this data with the Land Atmospheric Near real time Capability for EOS (LANCE) website using the EOSDIS User Registration System.
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