1. The Geosciences are a discipline that is strongly data driven, and large data sets are often developed by researchers and government agencies. The complexity of the fundamental scientific questions being addressed require a variety of data with integrative and innovative approaches if we are to find solutions. Geoscientists have a tradition of sharing of data, but being willing to share data if asked or even maintaining an obscure website accomplishes little. Also as a community, we have no mechanisms to share the work that has been done when a third party cleans up, reorganizes or embellishes an existing database. We waste a large amount of human capital in duplicative efforts and fall further behind by having no mechanism for existing databases to grow and evolve via community input. Some Thoughts About the Need for Cyberinfrastructure

2. Data Set : A relatively raw compilation of data (standards, formats, completeness may be questionable) Data Base : A mature data compilation that has been “cleaned”, standardized with input from the scientific community, formatted for use by others (not based on proprietary software, e.g., ORACLE) Data System : A linked and organized set of data bases including public domain software (not platform dependent) and procedures to analyze the data Some Definitions

3. Goals of the gravity data system effort Construct an updated gravity database that will have excellent spatial coverage and quality that will serve a diverse community of users, while being simple to access and flexible enough to meet the range of applications and changing needs of users. Create a structure to provide efficient updating and to encourage additions of new data by users (i.e., craft a living database) Construct a robust toolbox of public domain software. Link this specialized data system into an emerging broad national (and North American) geoscience data system.

4. Software Development Efforts 1.Advanced technique to remove duplicate measurements and to provide for merging of new data without creating new duplicates (new high quality data will be time- stamped) 2.Advanced technique to detect erroneous values 3.Web interface to the data system (26 students in a software engineering capstone class are involved) 4.Mapping software (GUI for GMT) 5.Modeling software (graphical interface for 2.5 D models) 6.Digital processing (published USGS package - a start) 7.Data reduction equations (community consensus)

5. GDRP1 - welcome

6. Map search

7. GDRP3 - search results

8. From Geological Survey of Canada websiteFrom Geological Survey of Canada website

9. GDRP2 - base stations

10. Base station description

11. Base station picture

12. GDRP4 - upload NSF

13. Status and Products Web-based data system Web-based data system Gravity database (U. S. first pass done; TCs done/online soon) Base stations (U. S. Stations available on line) Educational material (Tutorial done) Standards (Committee consensus, implementation underway) Links to other related sites (done) Software to manipulate data (subgrids, profiles, filters, etc.) (Partly done) Modeling software (2.5D done) North American Grids North American Grids North American Maps North American Maps