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FAQs

 

 


How do I access the data?

 

The data can be access through one of the available services such as: OPeNDAP, Mirador or by directly accessing the primary archive of the data. To access the the data you can get the information from the program pages under the MEaSUREs Program section in this portal.


 

Where can I find documentation on the products?

 

Documentation on the products can be found by clicking on the MEaSUREs Program in the selection in the MEaSUREs Programs in this portal. A section on documentation will be available and links provided.


 

What is Mirador?

Mirador is a simplified interface for searching, browsing, and ordering Earth science data at NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). Mirador is designed to be fast and easy to learn.



How can I retrieve data?

Retrieving data is simple using Mirador. Type in the search parameters describing the data you want, add it to the cart, then checkout. You will be able to download your data using several different methods.



What do I search for?

Mirador is a tool used to search for Earth science data. You can search for anything from an instrument or satellite name, to the names of measurements you are looking for (i.e. Calibrated Radiances).



Is Mirador data free?

Yes. The data is archived at NASA's Goddard Earth Sciences Data and Information Services Center (GES DISC).



Do I need to register?

No. All of the data at NASA's Goddard Earth Sciences Data and Information Services Center (GES DISC) is online and available for immediate FTP download.



How do I subset data?

Several, but not all of the data sets available through Mirador may be subsetted spatially, by parameter, by channel, or by variable. The particular type of subsetting that can be performed varies according to the data set. When files from any data set that can be subsetted are chosen to be added to the Mirador shopping cart, a subsetting service for that data set can be selected from a page displaying the Available Services for each data set. Once you choose a subsetting service and select "Continue to Shopping Cart", those files added to the shopping cart will be subsetted when you download them, either individually from the Shopping Cart page, or in bulk when you checkout.


When I try to download subsetted data, why am I told the data is not available for downloading?

If you select a spatial subsetting bounding box for a data set that does not have global spatial coverage, it is possible that your bounding box does not overlap the spatial coverage of the file being subsetted. In that case, when you attempt to download the file, a web page will be displayed that says that the file is not available for downloading. This is less likely to happen if the bounding box used for subsetting is the same as the bounding box used as the location when searching for files.
 



How do I convert data to NetCDF?

Several, but not all of the collections available through Mirador may be converted to NetCDF. When files from any data set that can be converted to NetCDF are chosen to be added to the Mirador shopping cart, a Convert to NetCDF service for that data set can be selected from a page displaying the Available Services for each data set. Once you choose "Convert to NetCDF" and select "Continue to Shopping Cart", those files added to the shopping cart will be converted when you download them, either individually from the Shopping Cart page, or in bulk when you checkout.


How do I work with HDF5/HDF-EOS5?

 HDF-EOS5 is just an HDF5 with some extra structures. We strongly recommend to acquire the command line utility "h5dump" from the HDF Group:

http://www.hdfgroup.org/HDF5/

and carefully review all command line options for this utility. Perhaps the most important is the "-n" option that would list the HDF5 file content. In this list, Users should carefully observe the paths to the data sets. They have the importance of the absolute paths to files in Unix. Users must use accurately the path to a dataset to gain access to it  with whatever software/tool is at their disposal. In IDL (we do not, however, endorse any software over another), for example,  there would be thee commands to read a GSSTF2b dataset:

 

  ;Open interface to HDF-EOS5
 f_id=H5F_OPEN('GSSTFM.2b.2008.12.01.he5')

 

  ;Read Latent Heat Flux into IDL variable "E"
  d_id=H5D_OPEN(f_id,'/HDFEOS/GRIDS/SET1/Data Fields/E')
  E=H5D_READ(d_id)

 

In any case, Users should do some minimal homework and study the HDF5-relevant functions of the software they use (IDL, MatLab, Fortran, Python, etc.), and usually the cost of gaining acces to a HDF5 dataset is simply a set of a couple of  simple commands similar to the above.

 



How do I download related data products?

To download AIRS LEVEL 1B related data products together, put AIRS L1B in the keyword field.
(AIRHBRAD, AIRVBQAP, AIRIBQAP, AIRIBRAD, AIRVBRAD, AIRABRAD)

To download AIRS LEVEL 2 related data products together, put AIRS L2 in the keyword field.
(AIRH2CCF, AIRH2RET, AIRX2RET, AIRI2CCF, AIRX2SUP, AIRH2SUP).

To download AIRS LEVEL 3 related data products together, put AIRS L3 in the keyword field.
(AIRX3STD, AIRH3STD)

To download AIRS LEVEL 3 monthly related data products together, put AIRS monthly in the keyword field.
(AIRX3QPM, AIRH3QPM, AIRX3STM, AIRH3STM, AIRH3ST8)

To download AIRS LEVEL 3 5 day products together, put AIRS pentad in the keyword field.
(AIRX3QP5,AIRH3QP5,AIRX3QM5,AIRH3QM5)

To download AIRS LEVEL 3 8 day products together, put AIRS 8 day in the keyword field.
(AIRX3ST8, AIRH3ST8).


 

I want to download a large volume of data for a particular dataset.  What is the best way to do that?

For obtaining large numbers of data files, we recommend the Mirador search tool:

  1. Go to http://mirador.gsfc.nasa.gov/index.shtml
  2. Enter your search criteria in the Keywords blank to locate your desired datasets. If you know that product's "shortname" (e.g.,, "TRMM_3A12"), that is the best bet. Otherwise type in multiple terms to constrain the search better. (The search uses a Google appliance, so many of the usual tricks will work.)
  3. In the Time Span textbox, enter your time span of interest.
  4. In the Location textbox, enter your spatial area of interest.
  5. Click the "Search GES-DISC" button.
  6. The result page from the search will supply a list of products. Note the approximate estimate of number of files and total size for that product. If you are very confident this set of files is the one you want, you can check the box by the data product and click "Add Selected Files to Cart". Otherwise, click on the View Files button under the listing of the desired product to see the first page of files in that product. Add files by checking the boxes and clicking "Add Selected Files to Cart", or instead of checking, click "Add All Files in All Pages to Cart".
  7. The next page is the service selection page – you can "Continue to Shopping Cart" or apply available services first. (Depending on the product, these may include subsetting, reformatting or download through HTTP instead of FTP.)
  8. After you continue to the shopping cart, select "Checkout" in the Cart Options at the top. In the Checkout page, you will see buttons that generate a list of URLs for all of the files in the shopping cart, along with instructions on how to download them in a batch.
  9. Clicking on one of the "URL List" buttons in the Checkout page will bring up this list in a new window in your browser. Save this to a file on your computer, and then feed this to an FTP utility such as wget or curl as indicated in the instructions. Note that other, more advanced options for download are also available in the "More Download Options" tab.

 


There are missing files from SeaWiFS Deep Blue products.  Why?

 SeaWiFS had observations from September 4 1997 to December 11, 2010.  Due to instrumental and algorithm problems, there are days without valid data.  You can find out those missing days from this SWDB_missingDataDays table.

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Last updated: Jul 18, 2013 11:44 AM ET
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