1. The Structure of the WODC Directory
   • Instructions for Retrieving Data from the WODC Subdirectory
2. The Structure of the WUDC Directory
   • Instructions for Retrieving Data from the WUDC Subdirectory

1. The Structure of the WODC Directory

The form of the WODC directory structure is outlined below. Refer to documentation files contained within these subdirectories for further information.

[Archive-OldFormat]
   |
[wodc] ---|
          |--- special.txt
          |
          |--- [archive]                         Key to Data Directories
          |       |                              -----------------------   
          |       |--- [tot] --- stn001.tot      TOT: Total Ozone       
          |       |--- [son]        .            SON: Ozonesonde
          |       |--- [umk]        .            UMK: Umkehr (Vertical Dist.)
          |       |--- [sfc]     stnNNN.tot      SFC: Surface
          |       |--- [lid]                     LID: Lidar
          |
          |--- [1999]
          |       |
          |       |--- [mmmyy]
          |               |
          |               |--- month.type (See above Key to Data)
          |
          |--- [document] ---|--- readme.tot
                             |--- readme.son
                             |--- readme.umk
                             |--- readme.mk2
                             |--- readme.sfc
                             |--- readme.lid
          

The directory structure on the WOUDC FTP server illustrates the two primary sources of ozone data: 1999 and archived data. The subdirectory [1999] conatins data submitted in 1999 or for the data year ending 1999. NOTE: data for the year 2000 and onward will only be available in the Archive-NewFormat directory.

Within the subdirectory [archive] are time series of all data sets available from each station up to the current month posting. This will continue for data up to the end of 1999.

Instructions for Retrieving Data from the WODC Subdirectory

	
	
1. Choose the appropriate readme file (for the data type of interest) from 
   within the directory "document":

                readme.tot      total ozone 
                readme.son      ozonesonde
                readme.umk      Umkehr
                readme.mk2      Umkehr-C Notes
                readme.sfc      surface ozone
                readme.lid      lidar

2. Each readme file will detail how to access and interpret the data fields.

3. The directory "archive" contains files organised by data type and named by 
   WODC station number with the extension also representing the data type.

    Example:  stn065.tot is total ozone data for Toronto (AES-WODC), CANADA

2. The Structure of the WUDC Directory

The form of the WUDC directory structure is outlined below. Refer to documentation files contained within these subdirectories for further information.

[Archive-OldFormat]
   |
[wudc] ---|
          |--- action-spectra.asc         
          |
          |--- [archive]
          |        |
          |        |--- process.txt
          |        |
          |        |--- [level_0]
          |        |
          |        |--- [level_1]
          |        |
          |        |--- [level_2]
          |        |       |   
          |                |--- [station name]
          |                          |
          |                          |--- Help & site specific documentation
          |                          |
          |                          |---[year]
          |                                |--- UVBdddyy.iii
          |                                     Where ddd is Julian day, 
          |                                            yy is year
          |                                           iii is instrument number
          |
          |--- [document]
          |        |--- overview.wudc
          |        |--- fmtout02.txt
          |        |--- flwudc2.txt
          |
          |--- [software]

Within the subdirectory [archive] are WUDC sanctioned data (for retrieval), along with any accompanying support documentation provided by the scientific authority from the sponsoring agency. Typically, this information is included as a text file, part of the Scientific Sponsorship Statement (SSS) or in addition to the SSS. The file "process.txt" describes the data processing procedures the WOUDC has followed to provide the data output products found in the [archive] directory.

Each data originator must provide an SSS in the form of a text file. The filename will reflect the agency of the data originator.

Information about calculations used by the WUDC regarding Action Spectra is found in the document action-spectra.asc.

Instructions for Retrieving Data from the WUDC Subdirectory

The data available for users at the WUDC are all stored as ASCII files. The data are organised into three levels (level 0 - primary data, level 1 - processed data and level 2 - gridded data).