SO2 data and alert service

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Product information

Introduction
 
Slant column density vs.
vertical column density
Geographic regions
Data presentation
and delivery
Solar Zenith Angle
What is the Dobson Unit?
 
Slant column retrieval
Background correction
Reference spectrum
Cloud cover fraction
 
Near-real time service
Criteria for exceptional
SO2 concentrations
 
Air-mass factor using
look-up tables
Air-mass factor using a
chemistry transport model
SO2 column from OMI
 
Time period of
available data
Data format specification
Data and Service
version history
Validation of the
data products
South Atlantic Anomaly
 
Downloading
data & image files
Documentation
References
Acronyms
Acknowledgments

 
NOTE:   This is the OLD product info. Some parts of it are no longer up to date, while other parts are missing -- see the remark on the main product info page.

Downloading data & image files

This page gives some notes regarding: If you want to use data or images for a publication,
in whatever form, please let us know!
We would like to keep a record of the usage of the data.

When using data or images, please mention by what
instrument aboard which satellite the data was aquired,
and that data and images can be found on the TEMIS
website at http://www.temis.nl/

 

Downloading data files

The data files can all be downloaded by hand from the data archive access pages or from the data source given. This manual downloading is convenient for data from individual days or a few days.

For downloading many files you can send an email requesting the data and the files will be zip-ed together and made available for ftp-download.

Alternatively, use a script to call a program that can automatically download files from the web, such as "wget" (available here): 

    wget [options] URL
or a text-based browser, such as "lynx" (available here): 
    lynx -dump URL > output_file

 
Below follow some examples in the "wget" format, where 

{DataPath}=http://www.oma.be/BIRA-IASB/Molecules/SO2archive/vs/
for short. For other sources of the data the URL is of course different; this one is valid for the SCIAMACHY data available via this website.

 
To download the HDF file with the daily gridded data for 17 June 2005: 

wget {DataPath}/SciaDat/2005/06.hdf/17/so2cd20050617.hdf
To downlowd the HDF file for the 3-day composite of 10-12 May 2005: 
wget {DataPath}/SciaDat/2005/05.hdf/1012/so2cd2005051012.hdf
To downlowd the HDF file for the monthly average of November 2004: 
wget {DataPath}/SciaDat/2004/11.hdf/month/so2cd200411.hdf
To download the zip-ed ASCII data files for 26 September 2004: 
wget {DataPath}/SciaDat/2004/09.dat/26/so2cd20040926.zip
To get access to a larger set of data files in one go, you can use the data product contact to send in a request and the data files will be made available via anonymous ftp.

 

Downloading image files

The images (maps) presented on the website can be downloaded in a similar way as downloading the data files mentioned above.

Have a look at the images in the archive to see what the file names look like. Images of the slant column density start with so2sc, those of the vertical columns start with so2vc, and the cloud cover fraction images start with ccf. After that follows a string representing the date(s) and the region.

 

High-resolution image files

High-resolution images can be obtained from the data product contact via email or anonymous ftp. When asking for high-resolution image, please specify:
  • the format: PostScript, GIF, PNG, JPEG or TIFF
  • if not PostScript, then either the size of the image in pixels, or the size of the image in cm or inch, as well as the resolution in dpi
  • the date and region to plot
  • the data type: daily data at orbit or grid coordinates, 3-day composite, monthly average
  • whether you want the plot in colour (as on the web) or in a greyscale
Note that since these images have to be produced by hand, it is not possible to get a large number of images. 		 

 

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page last modified: 27 November 2009
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