IEDA: Marine Geoscience Data System Integrated Earth Data Applications homepage

BSR Nankai ew9907

Purpose

Purpose
The purpose of this NSF-sponsored project is to organize seismic reflection/refraction data into a modern relational database management system accessible through the Internet. The system is designed principally for academic scientific use. Users include scientists, research staff and students from around the world that have high bandwidth Internet access. The web site provides access to metadata, SEG-Y files, navigation files, seismic profile images, processing histories and more. The main features of the web site include a geographic search engine using Google Plugins, a metadata search engine, and metadata pages for the various seismic programs. Metadata are uploaded into mySQL, a public-domain SQL server, and then PHP scripts query the metadata and directories, creating web pages, displaying images, and providing ftp links.

Data Integrity
Because much of the data are legacy in nature, we make no absolute claims to accuracy of the data identification, acquisition parameters, processing methods, navigation, database entries or search methods. However, it is our intention to be as accurate as possible.

Terms and Conditions
For inclusion in the DMS all metadata, including navigation and small raster images must be freely accessible regardless of other restrictions. Other basic requirements for inclusion: SEG-Y formats, navigation and a correlation between seismic traces and navigation.

The web site contains public, access restricted and proprietary data.
- Access restrictions placed by scientists contributing data are maintained until they approve release. These are principally governed by NSF data sharing policies.
- Access to proprietary data (from industry consortia, special gifts, etc.) is determined by the contributing institution including negotiating terms, conditions and cost.

Data are provided with the express understanding that they will not be sold or given to third parties. Data are not provided for inclusion with other commercial databases or web sites without prior written approval.

Database Schema
UTIG's database schema is presented in a PDF file. UTIG's database tables are described in a PDF file and an HTML file.

Data
The UTIG seismic data center uses UNIX/LINUX programs to process and store seismic data. The actual data files (including SEG-Y, navigation, images, related documents) are stored on disk. The file names and associated metadata are stored in a MySQL database. PHP and html files are used to access the database and produce dynamic web pages presenting the data to users. Users can click on links to add data to a 'cart' and then request the data. Cart scripts gather the data into either tar.gz or zip files and email the user a link to download the data. A user login is required. Some PHP scripts generate statistics on usage.

Data access
The UTIG seismic data center has 3 types of access: restricted, limited, and unrestricted. The web page
http://www-udc.ig.utexas.edu/sdc/cruise_intro.php
lists all the cruises, color-coded by access level.

Unrestricted access - all files are available to the public for download.

Limited access - for NSF-funded data sets where the data contributor doesn't want unrestricted access yet. The small-scale GIF images, processing history files, and navigation files are available to the public. Requests for the SEG-Y files and large-scale GIF images are sent to the data contributor.

Restricted access - reserved for industry-sponsored data sets. Gail Christeson is the contact for the IC1010 Gumbo data set and Patty Ganey-Curry is the contact for the R/V Ida Green (IG) and Fred Moore (FM) data. Requests for the SEG-Y files and large-scale GIF/PDF images are sent to the Gail or Patty. The small-scale GIF images, processing history files, and navigation files are available to the public.

 


Updated April 23, 2018