Introduction: An enormous amount of digital image data has been collected for Mars, the Moon, and other planetary bodies from many missions and instruments in the past four decades. Historic photographic data such as those from Lunar Orbiter and Apollo are being digitally restored [1-3], and large volumes of data from new missions are being acquired daily [e.g., 4]. In many cases, these data exist in a wide range of disparate coordinate systems, making it difficult for the scientific and mapping communities to correlate, combine, and compare data from different missions and instruments. The Unified Planetary Coordinates (UPC) database of the PDS Imaging Node addresses these and other discrepancies [5, 6]. The UPC is a database that improves data search and retrieval capabilities for PDS image data for Mars and the Moon (at present), and permits geographic data searches. It allows users to readily identify, correlate and analyze cross-mission PDS data. The UPC provides an invaluable tool for cartographic data processing by enhancing the ability to identify overlapping image sets to create mosaics and maps. Finally, because it is compatible with Open Geospatial Consortium (OGC) standards, it can easily be used by other search tools, within [e.g., Imaging Node's Planetary Image Atlas and outside the PDS. UPC Overview: The UPC has three main parts: (1) a database containing improved geometric and positional information about planetary image data that has been computed using a uniform coordinate system and projection onto a common (preferably 3D) planetary surface shape, (2) a process by which continual maintenance and updates to the content of the database are performed , and (3) a web-based interface, called the Planetary Image Locator Tool (PILOT; see http://pilot.wr.usgs.gov) to search the database quickly and efficiently, to view image footprints and thumbnails for information on data coverage,