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GrADS Data Server (GDS)

There are two ways to find a dataset in GDS.

1. Use the link on the data page to go to the GDS page of desired dataset.
• Click the OPeNDAP link from the data page.
  
• For example, for "NRL NLOM 1/16° Nowcast (6/02/02-3/11/06) output", click link.
• Jump to OPeNDAP dataset page.
2. From the GDS main page.
   • Traverse the directory structure to find the dataset.
     
   • For example, "NRL NLOM 1/16° Nowcast (6/02/02-3/11/06) output" are in "public_data -> NLOM".
     
     Note: Find the directory(s) -> dataset and make OPeNDAP URL like this:
     http://apdrc.soest.hawaii.edu/dods/[directory(s)]/[dataset] where dataset is followed by info dds das.
   • Jump to OPeNDAP dataset page.

OPeNDAP dataset page

• The dataset lists different categories in a dataset.
  • For example, NLOM listing 4 entries on the "Public data" server, which looks like this:
    
    
  • Choose the first category from the 4 entries
    1: nlom_ssh:  NLOM SSH   info   dds   das
• Click info to know more for dataset OPeNDAP information page.
  • Information (info): contains detailed information about the data in a more readable format.
    For example, NLOM information page:
    
  • Dataset Descriptor Structure (dds): contains a description of the structure of the data.
  • Data Attribute Structure (das): contains information about the data such as the name of the variable, its unit, and its type.
• The OPeNDAP/DODS Data URL is near the top of the "info" page and looks like this:
  • OPeNDAP URL:
    http://apdrc.soest.hawaii.edu/dods/[directory(s)]/[dataset]
  • Authenticated OPeNDAP URL:
    http://apdrc.soest.hawaii.edu/dods/[authenticated_directory(s)]/[dataset]
    Note: User-friendly analysis and visualization programs will have pop-up to input username and password.
  • Authenticated OPeNDAP URL with username and password:
    http://username:password@apdrc.soest.hawaii.edu/dods/[authenticated_directory(s)]/[dataset]
    Note: Advanced analysis and visualization packages require username and password to be included in the URL.
• For example, NLOM SSH OPeNDAP URL is:
  http://apdrc.soest.hawaii.edu:80/dods/public_data/NLOM/nlom_ssh
  Note: we can ignore the port 80 on the URL:
  http://apdrc.soest.hawaii.edu/dods/public_data/NLOM/nlom_ssh
• After determining the OPeNDAP URL, users can access data by referring to their favorite client tool's tutorial.