Introduction: Over the past 40 years, a vast array of remote sensing data has been collected for the terrestrial planets and outer planet satellites by orbital and flyby missions. Unfortunately these mapping data exist in a range of disparate coordinate systems, making it difficult to easily identify and correlate data from different instruments. The goal of the Unified Planetary Coordinates [1] project is to solve this problem—to provide easy access to planetary data in a set of unified, consistent coordinate systems. The Unified Planetary Coordinates (UPC) database is being developed at USGS and JPL with funding for the Imaging Node by the NASA Planetary Data System (PDS). The UPC provides a geometric relational database with orbital remote sensing data stored in a set of uniform coordinate systems. The database can be accessed with geographic information system (GIS) tools so that geometric coordinatebased searches can be conducted for regions of interest (ROIs). All geometric data are computed using the ISIS 3 system [2] from the best available SPICE ephemeris data. SPICE initially comes from flight projects through the NAIF facility [3] and for each mission SPICE is continually refined by USGS mapping efforts [4]. We create control nets and new kernels that are fed back into the UPC. Database Population: The UPC has been initially populated with Mars image data from the PDS [5]. New images are identified and staged in the UPC for download and processing in ISIS 3 [2]. For imaging and spectrometer data to be included in the UPC, ISIS 3 must be able to ingest the data and must have a geometric camera model for the instrument. A series of ISIS 3 applications (Fig. 1) are run on the Planetary Data System (PDS) labeled images that compute all parameters that are inserted into the UPC. The first step is to extract the PDS label PVL keywords and values and insert them into the instrument-specific tables of the UPC. The SPICE inventory is searched to determine if sufficient ephemeris data exist to compute geometric parameters. If so, a full set of geometric parameters are computed and inserted into the UPC. Data Selection: Web-enabled interfaces provide indirect access to the UPC database. This provides the greatest flexibility to users and developers, and will facilitate data access via the PDS Image Atlas (an online planetary image atlas developed and maintained by the Imaging Sub-Node at the Jet Propulsion Laboratory). A common set of geometric parameters has been selected for all data. Mission-specific parameters are also included but search capabilities using these are less flexible due to the diversity of possible parameters. Use of common parameters is an important characteristic because it allows many different datasets to be combined in a single query.