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Optimizing Access to Distributed Scientific Datasets

OPeNDAP is a free, open-source software that streamlines workflows & reduces costs for researchers, data managers & data providers.

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Python Data Access Tutorials

Photo by NASA

GET INVOLVED

New to OPeNDAP? Start here.

Learn How to Get Started with OPeNDAP

Check out our data access tutorials, all written in Python, to better understand what OPeNDAP can do!

Take me to tutorials!

The OPeNDAP team speaking with booth visitors at AGU 2025.

Contribute to the OPeNDAP Community

Share your insights with fellow users, attend our events, or contribute to our open-source code.

Work with the OPeNDAP Team

Have some unique data needs? The OPeNDAP team is always open to collaborations on research proposals and contracts.

Did you know? OPeNDAP is also a 501(c)(3) nonprofit corporation with the mission to Democratize Data Access.

OPeNDAP accelerates data-driven discovery

Used by NASA to enable discipline neutral open data access.
Implements the DAP4 protocol, a comprehensive data model that enables data-proximate subsetting: Get only the data you need!
Produces, parsers, and exploits the DMR++, a metadata reference file that enables
- Analysis Ready Cloud Optimized (ARCO) access to archival self-describing data file formats.
- Efficient chunk-based retrieval of cloud-hosted data via the DAP4 protocol.

BENEFITS OF OPeNDAP

Why Use OPeNDAP?

Retrieve Specific Subsets of Data

Access only the data points you need, eliminating the prohibitive time and cost of downloading full datasets.

Multiple File Formats

OPeNDAP “translates” data so that you can access data originally stored in a wide variety of file formats.

Multiple Data Types

OPeNDAP supports many types of data analyzed in scientific inquiry including gridded data, time series, and more.

Integration with Preferred Tools

Data files served through OPeNDAP can be accessed and read by commonly used tools including NetCDF, Python libraries, MATLAB, ArcGIS, and Panoply.

Extensibility & Customization

Have a unique distributed data need? Build on our open-source code yourself, or work with our team to create a custom server application.

FOR DATA ACCESS

FOR DATA MANAGERS

FOR DATA PROVIDERS

OPeNDAP nebula

Open Data Access Accelerates Discovery

30+

years

of experience in open data access frameworks

14+

data handlers

broad data format compatibility

10+

access patterns

broad adoption from distinct client APIs.

10+

petabytes

of data accessed through OPeNDAP’s framework

CLIENTS & FUNDERS

OPeNDAP Supporters

The following institutions have provided (and some continue to provide) financial support to OPeNDAP.

VIEW ALL SUPPORTERS

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