This document describes the development of a prototype Web GIS server called the NASA Web GIS Server (NWGISS) to serve HDF-EOS data to GIS clients according to Open Geospatial Consortium (OGC) Web Mapping specifications. The NWGISS implements OGC map, coverage, and catalog server interfaces to allow easy access and utilization of HDF-EOS data for various remote sensing missions. A demonstration version of the NWGISS has been set up with sample data to test its capabilities.