US Government security requirements no longer permit CDDIS to offer data via traditional unencrypted anonymous ftp; this service was discontinued on October 31, 2020. All data are still available, however access must be via HTTPS or ftp-ssl.

Instructions with examples and our FAQ can be found at:

If you still have difficulty after reading and attempting the examples on that page, please contact us at

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GSAC search tool

Direct access to the CDDIS GSAC implementation will be available soon. In the meantime, more information about GSAC can be found at the UNAVCO website, Access to the federated GSAC search tool is available at: