The Center for Spatial Information Science and Systems of George Mason University developed open-source OGC Web Coverage Service (WCS) to serve HDF-EOS data. The specification used is WCS Earth Observation Application Profile (EO-AP). The Swath and Grid data of HDF-EOS2 and HDF-EOS5 are supported in this WCS. GMU WCS adopts the MIT license for the open source reference implementation; all source code and tutorial are available online.