The document discusses a project to improve long-term preservation of Earth Observing System (EOS) data by creating independent maps of HDF4 data objects. The project aims to map HDF4 files to allow simple readers to access data without relying on HDF software. It involves categorizing NASA HDF4 data, prototyping an XML mapping file format, and building tools to create maps and read data based on maps. The project will investigate integrating the mapping schema with standards, address HDF-EOS2 requirements, redesign the schema, implement production mapping and reading tools, and deploy the tools at NASA data centers.