OF MASSIVE IMAGING DATA SETS. J. L. Dickson1, B. L. Ehlmann1,2, L. Kerber2, C. I. Fassett3, T. M. Hare4, D. P. Quinn5, L. Plesea6, D. Noss7, 1California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, 91125 (jdickson@caltech.edu), 2Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA 91109. 3NASA Marshall Space Flight Center, Huntsville, AL 35805. 4U.S. Geological Survey, Astrogeology Science Center, Flagstaff, AZ, USA. 5University of Wisconsin, Madison, Department of Geoscience, Madison, WI, USA. 6ESRI, Redlands, CA. 7Mars Space Flight Facility, 201 E Orange Mall, Arizona State University, Tempe, AZ 85287 USA.

Introduction: JPL’s Web Map Server (WMS) which hosts the two planetary data servers called OnMars and OnMoon is a very high performance implementation of the ISO Standard WMS. The specific technologies used for this work are the existing open methodologies defined by the Open Geospatial Consortium (OGC) [1], which we have extending and generalizing for the planetary case. In 2007, the development of OnMars and OnMoon servers is under way; we continue to add functionality for more complex data services such as 3D, anaglyph generation, larger datasets as well as support for high traffic applications. This abstract describes the history, hardware, and software behind the servers.

Introduction: This abstract outlines a proposal to improve support for planetary coordinate reference systems (CRS) within existing open geospatial standards and geospatial applications. This will allow mapping applications, whether they are using streamed or local data sets, to recognize a defined planetary CRS and give them the ability to overlay multiple data sets from different sources and implement accurate geodesic calculations. Motivation: We are adapting well-defined open geospatial standards and technologies for the access, processing, and display of geo-spatial data to the planetary domain as discussed in a companion abstract in this volume [1]. To fully understand this proposal, we must briefly discuss the current open spatial technologies as they have been developed for Earth-based applications [2]. The Open Geospatial Consortium (OGC) was built to help establish and promote a series of Internet protocols and file specifications for sharing geospatial data [3]. One of these standards, called Web Mapping Services (WMS), has become an extremely popular method used to stream simple geospatial data sets across the Internet to mapping applications or simple web browsers. For each data set provided, the data server must define a minimum set of information such that the client application understands not only the data layer but the current CRS or map projection. Currently, web mapping servers normally default to using the numeric European Petroleum Survey Group (EPSG) codes to define the CRS or SRS (Spatial Reference Systems) [4]. For example, code "4326" is the EPSG identifier for Earth's "WGS 84" geographic CRS. The server and client relay this code by passing an in-line SRS request using the string " SRS=nameSpace:code " (e.g. " SRS=EPSG:4326 "). Additional EPSG codes were generated to attempt to catalog the most widely used cartographic map series from all countries (e.g. " 32612 " = WGS 84 / UTM zone 12N; " 21413 " = Beijing 1954 / Gauss-Kruger zone 13). One will quickly realize the options for these codes would be infinite. And if the CRS is not part of the EPSG database, and no planetary definitions are, there is the option to explicitly define custom settings. However, using these custom settings are rarely supported in software packages. And while folding planetary CRS definitions into the EPSG standard is an option, it is not ideal. Proposal: To help solve this incompatibility among planetary servers, we have approached the

s of the Annual Meeting of Planetary Geologic Mappers, Washington, D.C., (2005), USGS Open-File Report 2005-1271, URL: http://pubs.usgs.gov/of/2005/1271/ . Additional Information: This work is funded under the NASA AISR Program. The website portal can be found at http://webgis.wr.usgs.gov/ogc Lunar and Planetary Science XXXVII (2006) 1463.pdf