NASA's Earth Observing System (EOS) archive includes data collected over many years by many satellite instruments. These data are stored in the HDF format that includes data and metadata. The content of the metadata was examined for compliance with a set of conventions developed by the NASA science community at the beginning of the EOS Project (the HDF-EOS conventions). The initial results show that ~50% of the data files and 76% of the datasets have metadata that allows them to be used easily in standard tools. This talk was presented at the ESIP (espied.org) meeting during January 2014.