Aniuk Consulting, LLC, proposes to create a GIS software toolkit for easily converting NASA HDF-EOS data into formats that can be readily used within a Geographic Information System (GIS) or other geospatial software programs. The Hierarchical Data Format (HDF) is a widely used scientific data format and serves as the standard format for NASA EOS products. The HDF-EOS toolbar will allow a user to reformat, re-project, and perform geospatial operations on NASA EOS data. This toolkit is designed to improve upon current HDF conversion tools and will be packaged as a software extension for ESRI's ArcGIS 9.3 suite of products. In addition, we will assess the feasibility of extending the HDF-EOS toolbar to operate within an existing open-source GIS package. This proposal targets the "Data Analyzing and Processing Algorithms" research initiative announced by the Goddard Space Flight Center by exploiting spatial tools in order to increase the accessibility, interoperability, and inter-use of HDF-EOS data within the GIS/Geospatial research community.