EDG Search and Order Tips for TES Data Products

This page provides a few tips for searching and ordering TES data through the EOS Data Gateway (EDG).

TES Data File Information

TES began making measurements on August 22, 2004. The routine TES observation mode is to produce global survey standard products spanning 16 orbits on a 50% duty cycle, or approximately every other day. The "off" days can be used for special observations such as intensive campaigns to observe volcanic eruptions, biomass burning, and pollution events.

TES Level 1B

• TES Level 1B data files contain radiometric calibrated spectral radiances and their corresponding noise equivalent spectral radiances (NESR). The geolocation, quality and some engineering data are also provided.
• A Level 1B data file contains data from a single TES orbit for one focal plane. Note that a TES orbit starts at the South Pole Apex.
• A Level 1B granule contains four files for a single orbit, one file for each of the four focal planes. Note that a granule is the orderable quantity of data.

• The table below illustrates the TES Level 1B file naming conventions.

  ESDT Short Name	File Name	Product
  TL1BN	TES-Aura_L1B-Nadir_FPfp_rrun id-oorbit number_version id.h5	Standard
  TL1BSOL	TES-Aura_L1B-SO-Low_FPfp_rrun id-oorbit number_version id.h5	Special Observation/Low Resolution
  TL1BSOH	TES-Aura_L1B-SO-High_FPfp_rrun id-oorbit number_version id.h5	Special Observation/High Resolution

  • fp represents the two-character focal plane identifier: 1A, 1B, 2A or 2B
  • run id represents the ten-digit run identification number.
  • orbit number represents the starting five-digit Absolute Orbit number, which is the same as the Aura orbit number at the time of the South Pole apex crossing.
  • version id represents the version identification number, which is used to keep track of file format and file content changes. For more information about file version identification, see the TES Data Products Specification document.
  • .h5 extension denotes the use of HDF5 file format.

The EDG search results list displays the internal granule ID, e.g., a string like SC:TL1BN.001:10437634, rather than the file names, for TES Level 1B data, so the information that is contained in the file name is not visible in the list of data granules returned by an EDG search. Please see the tips in the Searching section below to see how to determine the file version id for TES Level 1B data.

TES Level 2

• TES Level 2 files contain measurements of a single molecular species or temperature. The Level 2 Ancillary Data Product contains information such as geolocation and spacecraft position, which are common to the individual Level 2 species and temperature Standard Product files. A TES Level 2 granule contains a single data file.

• The tables below illustrates the TES Level 2 file naming conventions.

  Standard Products

  ESDT Short Name	File Name
  TL2CH4N	TES-Aura_L2-CH4-Nadir_rrun id_version id.he5
  TL2CON	TES-Aura_L2-CO-Nadir_rrun id_version id.he5
  TL2H2ON	TES-Aura_L2-H2O-Nadir_rrun id_version id.he5
  TL2O3N	TES-Aura_L2-O3-Nadir_rrun id_version id.he5
  TL2ATMTN	TES-Aura_L2-ATM-TEMP-Nadir_rrun id_version id.he5
  TL2ANC	TES-Aura_L2-ANCILLARY_rrun id_version id.he5

  
  

  Special Observations

  ESDT Short Name	File Name
  TL2CH4NS	TES-Aura_L2-CH4-SO-Nadir_rrun id_version id.he5
  TL2CONS	TES-Aura_L2-CO-SO-Nadir_rrun id_version id.he5
  TL2H2ONS	TES-Aura_L2-H2O-SO-Nadir_rrun id_version id.he5
  TL2O3NS	TES-Aura_L2-O3-SO-Nadir_rrun id_version id.he5
  TL2TNS	TES-Aura_L2-ATM-TEMP-SO-Nadir_rrun id_version id.he5
  TL2ANCS	TES-Aura_L2-ANCILLARY-SO_rrun id_version id.he5

  • run id represents the ten-digit run identification number.
  • version id represents the version identification number, which is used to keep track of file format changes. For more information about file version identification, see the TES Data Products Specification document.
  • .he5 extension denotes the use of HDF-EOS5 file format.

Order Size Guidelines

To ensure that your order processes successfully, we request that you be aware of the total size of your order. Please use the following guidelines:

• No more than 20 Gbytes per order.
• Level 2 files are as large as ~ 400 MB each.
• Level 1 files are as large as ~ 160MB each.
• Large orders will be partitioned into multiple smaller orders of about 5 Gbytes each. You will receive e-mail notification when this occurs.

EDG Access

Note: Please read the alert message board highlighted in yellow on the EDG Home Page. This board provides important messages from the Data Centers (i.e., system maintenance downtimes, when ordering will be unavailable).

• Step 1: Access the EOS Data Gateway.
• Step 2: Select "Enter as guest" or "Become a registered user".
  By selecting "Become a Registered User" the EDG tool will remember your contact information and search preferences.

You have successfully entered the EDG and are ready to set up a search.

Searching

• Create Search.

  • In the Choose Keywords section you can:

    • Enter TES/Aura in the "Text Search" field to select all TES data sets (and edit the resulting list if desired), or

    • Select "DATA SET" in the category scrolling list in that section and select "Choose Keywords for >>", then choose the desired TES data sets from the lists presented

  • If you are interested in a particular version of the data, you can specify that by selecting "Product Generation Algorithm" in the category scrolling list and select "Choose Keywords for >>". Then enter the PGE version information (available from the TES Data Versioning table). Another way to check the version is to customize the results lists returned by a search. Near the top of the results page is a link labeled "Customize this table". On the subsequent page, add PGEVERSION to the Current Columns list and that field will be shown for the search results files. Use the TES Data Versioning table to match the PGE version to the file version.

  • If you wish to narrow your search by date, select "Choose a Date/Time Range".

  • Both the Level 1 and Level 2 TES granules have a specified geographic range of global (latitude 90S to 90N, longitude 180W to 180E). Specifying a "Search Area" will not be of benefit since all granules will match any specified search area, and, in fact, this will cause the search to fail.

• Select "Start Search" at the bottom of the page.

Depending on the system load, it may take some time for the search to complete. When results are returned, you are ready to place an order. A granule consists of a data file (or files) and the associated metadata file.

Ordering

• Step 1: Add the granules to be ordered to the shopping cart. *
• Step 2: Select order options for each product, selecting "Native Granule".
• Step 3: Complete Order form.
• Step 4: Verify Order information.
• Step 5: Submit order.

An e-mail receipt will be sent to the address specified in the order form.

* If this is your first order for a particular data set and version, a Data Quality Summary page will be displayed with links to the Quality Summary information for each TES data product. Selecting the product link will bring up a general EDG Data Quality Statements page. To view the TES Quality Statements, select the TES link and then on the appropriate Quality link(s). From this point, you will need to select the Back button until you get back to the Shopping Cart Data Quality Summary page and then select the "Accept" button to continue the ordering process. Note that this quality information is also available directly from the TES Data Set page and can be viewed at any time.

Delivery

A second e-mail message, with the subject "ECS Notification", will contain the details of how the order will be delivered. Each data file will be delivered with a metadata file that will be identified by the data file name with a .met appended.

NOTE: Your EDG order is available for 72 hours. If you have not received a notification message within 24 hours, contact Langley Data Center User Services.

A complete User's Manual is available through the EDG.