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CDDIS Archive Access

View instructions, with example code blocks, for accessing the Crustal Dynamics Data Information System (CDDIS) archive.

NASA's Crustal Dynamics Data Information System (CDDIS) supports data archiving and distribution activities for a global user community. Since its inception, users have relied on anonymous ftp to access and download files from the system. Although this protocol allows users to easily automate file downloads, many organizations, data systems, and users have already migrated from ftp or are actively pursuing a move away from the protocol due to problems from a system and security standpoint. U.S. Government agencies have become increasingly concerned about this legacy protocol and about ensuring data integrity for the user community, and have disallowed the use of the ftp protocol. CDDIS, located at NASA's Goddard Space Flight Center, has therefore addressed these concerns and provided alternative methods for users to access its archive and download data.

In October 2020, CDDIS discontinued anonymous ftp access to its archive. Users must now utilize more secure access protocols such as https or ftp-ssl.

How to Access the CDDIS Data Archive

In order to access the CDDIS archive, users must use a client that supports Transport Security Layer (TLS). When using the https protocol (for example, cURL, Wget, or Python commands/scripts), users need an Earthdata Login account. In addition, when utilizing the cURL and Wget, users need to create a .netrc file.

Examples of accessing the archive via TLS using various methods can be found below. In the examples, <email address> means type in your actual email address without the < and > symbols.

cURL Examples

 

Wget Examples

 

LFTP (Linux ftp) Examples

 

Python 3 Examples

 

Java Examples

If you are having issues with any of these examples, please check our archive download FAQ page in Earthdata Forum.