Navigation Data - Archive of Boomer Seismic Reflection Data Collected during USGS Cruise 99LCA01, Crescent Beach Spring, Florida, 26 April

The Navigation Data Includes:

GPS Navigation was provided by a Trimble Centurian P-Code receiver directly fed to the PC-based Triton Elics Delph Seismic acquisition system. The accuracy of this receiver is within 15 m, however the SEG-Y format only allows for seconds of arc which is equivalent to 31 m. This data was then edited to remove spurious fixes and these edited results were used to generate the trackline maps provided on this CD-ROM. These maps were generated with ESRI's GIS software, ArcView 3.2 as geographic projections (no datum), and are provided as GIF images. A position for every 500th shotpoint is also provided for easy registering of the data.

All navigation files are stored as flat ASCII text files. The raw navigation files are stored in the RAWNAV subfolder of the NAV folder at the top level of the CD-ROM. These files have not been edited and do not have year or Julian Day written in the record. The edited navigation files are stored in the EDITNAV subfolder, and the 500 shotpoint interval files are stored in the SHOTNAV subfolder, both of which are located in the NAV folder at the top-level of this CD-ROM. Both the edited navigation and the 500 shotpoint navigation have year and Julian Day added to each record.

Note: The shotpoint navigation provided in this report has not been corrected to reflect the 20 m offset of the source to the GPS antenna.