The Data Access Protocol (DAP) and related client-server software have emerged as an important standard for the Earth Science data system infrastructure. The deployment of OPeNDAP has improved access to data in many formats from many sources. The DAP protocol is widely used to access Earth Science data.

The Hierarchical Data Format (HDF) is a general purpose format and library, designed to support scientific data management and high performance computing. Version 5 of HDF(HDF5)has been developed with a more flexible data model, improved scalability, and built-in parallel I/O support. HDF-EOS5 (built on top of HDF5) is the primary data format for data from the NASA Aura satellite; HDF5 is also the data distribution format for National Polar Orbiting Environmental Satellite System (NPOESS).

With the growing importance of HDF5, it is important that DAP servers should be able to serve HDF5 data, as well as other formats based on it, such as HDF-EOS5. Furthermore, the existing DAP clients should be able to read HDF5 data via DAP. This poster will demonstrate the joint efforts between the HDF Group(THG) and the OPeNDAP Group on making existing OPeNDAP data clients such as Ferret,IDV,GrADS,NCL and ncBrowser to read HDF-EOS5 Grid data through HDF5-OPeNDAP data server.