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Mirador


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 find data which coincide with hurricanes?

On either the Mirador homepage, or at the top of any subsequent pages, is a form containing a field for Events. Many different kinds of events can be entered there, such as hurricanes, typhoons, storms, ozone, and aerosols. Hurricane data is constantly being added to the database so there is no way as yet to view a list of what hurricane data is in Mirador. So just enter a hurricane name of your choice in the event field, such as Bud, Katrina, Yagi, Yutu, Ewiniar, Ioke, John, Florence... Place a physical parameter or collection description in the keyword field. You may also limit the search by placing a time constraint in the time span fields. Results will come back that are constrained by the event you entered. Also, a 'Did You Mean' box is offered to allow you to narrow the results even more, perhaps by specifying the intensity of the event (hurricane and typhoon positions are recorded as they pass through various levels, such as tropical depression, tropical storm, category 1, category 2, etc).



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).



How do I download data over Aeronet stations?

Enter Aeronet Station into the location field and Mirador will give you a sampling of Aeronet stations. To find data over a particular station, such as China_Lake, enter china_lake station in the location field.


 

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.

 

How can I download more than 20,000 data files with Mirador, as that is the limit on the number of files (granules) that can be downloaded at one time?

This is common situation encountered in the use of Mirador. We usually suggest that users limit their temporal constraints (i.e., the span of time defined by the From: and To: dates) so that the number of granules is smaller.

For example: For the OMO3PR data product, you can download all 30,000+ OMO3PR granules in two batches using this procedure:

First, specify From: 2004 and To: 2007 [which means:(2004-01-01) to (2007-12-31 23:59:59). This will enable download for the first 17,000+ files.

Then specify From: 2008 and To: 2010 [which means:(2008-01-01) to (2010-12-31 23:59:59), and this will allow you to download the remaining files. (13,000+ files).


 

I am using a PC. Are there any alternatives to using "wget" or "curl" to download data from Mirador for my PC?

First, there is a "wget" option for Windows users:
http://gnuwin32.sourceforge.net/packages/wget.htm

Here are some other alternatives:

IMPORTANT! To access these alternative methods, it is necessary to go to our second checkout page, which you can get to by clicking the More Download Options checkout tab.

1. Under "GES-DISC DOWNLOAD MANAGER OPTION"
Download the "jar" file. Your browser may be configured to display the download dialog that this jar file contains. If not, find the Java executable on your machine, and run "java -jar nameof_Download_Mgr.jar".

2. If you are downloading "unserviced" files, (protocol is ftp://), use the "FTP SCRIPT BATCH OPTION". Click on one of the links there to download the script and run it, following the instructions we have under this option. You will need to have ftp on your machine.

-- or use the "ON THE FLY TAR OPTION":

3. Under "BROWSER BASED DOWNLOAD MANAGER OPTION"
Follow the URL Listing Page link, and use either of the Firefox Browser plug-ins: DownThemAll or Flashget.

 


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Last updated: Dec 02, 2011 02:20 PM ET