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· Data Group
· Spatial Coverage
· Day/Night Flag
· Science QA
- Results Table
- Metadata Table
Downloading Science Data
This document explains how to use the Data Pool interface to search for science data. Each screen displays the current search criteria table at the top, showing the elements you chose in previous steps. Each page also gives you a list of options. These usually include the options for how to select the values for the displayed criteria, an option to skip the current step, and a link to start a new search. The options list also includes a link to go directly to the results of the current search criteria by clicking Get the granules, which returns the data in a table.
On any page in the interface, you may need to scroll down to view all the options or buttons for the current search element.
As on other pages, the Search Criteria table lists the parameters that you chose for the search. To modify any of the parameters you chose, you can click on the links in the table.
The Data Pool search results display within a table that gives you options for how to view the data.
The first row of the Results table is the Metadata Display, which lets you define how to view the table results. The table initially displays the Size, Temporal, Day/Night data. The Cols drop-down menu at the top of the table provides two additional links, ScienceQA and Cloud Cover%.
Click on the ScienceQA or Cloud Cover% links to view the results in those terms.Set the maximum number of data sets displayed by changing the value in the #Rows drop-down menu.
Granule - The granule column contains the name of the granule and several optional icons. The name is actually a part of the granule UR (the granule id) and displays as a link if there is a science file present for this granule. There are several icons for each granule. The icons are described below, along with instructions on how to use them.
Download file icons provide links to the granule science file (containing the actual science data for the granule). See Downloading Science Data.
Download HDF granule, uncompressed
An Extended Markup Language (XML) file icon (), which is a link to the full metadata of the granule in .xml format. See Viewing Metadata.
A Browse icon (), which is a link to the granule browse image (a .jpg file). See Viewing Browse Imagery.
A Browse and metadata icon (), which is a link to the granule browse image and XML metadata.
A Convert and subset icon (), which is a link to a page where you can convert the format and projection, and perform spatial subsetting of the selected data granule. See Converting and Subsetting.
A Shopping cart icon (), which allows you to select granules to place in a shopping cart while you search for other data. See Shopping Cart.
In each case, these icons appear if the corresponding data are available in Data Pool.
To use FTP to transfer the granule's science file to your computer, click on any of the icons described in the Download section. If there is only a single science file for your granule, the FTP link displays a Save As dialog. If the granule has multiple science files associated with it, when you click on the FTP link, a dialog containing links for the multiple science files will appear. Click on the individual links to get the science files.
Note: Each of the file links displayed for downloading files is an FTP link. It is possible that the browser will not understand the file type referenced in the this link, and may try to render it as text.(If you're using Internet Explorer, you shouldn't have this problem if you use Version 5.5 or greater. If you are using an older version, you should upgrade it.) Use one of the following steps to make sure that the file is saved in the correct format:
To view the full metadata of a
granule, click on the XML () icon. This displays a new browser window
showing the full metadata hierarchy for the granule. To view the whole
metadata hierarchy, scroll down or expand the window. Navigation
links let you navigate the metadata hierarchies between granules. To save the XML file to
your local disk, click Save. A Save As... dialog
appears, where you designate the file name and location.
Note: Click on the Browse () icon to display the browse viewer. For granules with multiple browse images, the images are currently shown in a scrollable area with the browse viewer (scroll down to see all of the browse images in this case). To save any of the images, right-click on the image. A popup menu appears. Select Save As... or Save Image As.... A Save As... dialog appears, where you designate the file name and location.
You can choose an output data format and geographic projection, and spatially subset data granules using the HDF-EOS to GeoTIFF converter (HEG). This option is available for most MODIS data sets available at NSIDC. Refer to Table 1.
The shopping cart is a new feature in the Data Pool. This option allows you to select one or more granules to place in a shopping cart, so you can search and order data with different criteria and download everything from one location when finished.
When you click on the shopping cart icon (), the cart displays a list of granules, options for global conversion utilities, and download information. You may select individual granules for FTP download or download all the granules in the list. You may also simply choose to download granules without any conversion. Granules added to the cart will stay in the cart unless you remove them, or until you successfully submit an order. You can return to your results list or start a new search at any time. The shopping cart will remain active during your session only. This page cannot be bookmarked.
For downloads with formatting and projection changes or spatial subsetting, you will receive two e-mails from the Data Pool: one is an acknowledgement of your order and another contains the results of your order. The acknowledgement e-mail contains an order ID. The order e-mail is sent when your download request is fulfilled, and it contains a link to your files. You will have a limited period to access the files via FTP from the download site, before files are automatically deleted.
Page last updated: 01/11/13