Navigation Data

The Navigation Data Includes:

GPS navigation was fed to the acquisition system every second by a Rockwell navigation receiver. The accuracy of this receiver is within 100 m, however the data required some editing. A filter was designed to remove spurious data values and these edited results were used to generate the trackline maps provided on this DVD . These maps were generated with ArcView 3.2 as geographic projections, and are provided as GIF images. A position for every 500 shot interval is also provided for easy registering of the data, however this shotpoint navigation has not been corrected to reflect the 20 m offset between the source and the GPS antenna. All navigation files are stored as flat ASCII text files. The raw navigation files do not have the year or Julian day written into the record and are located in the RAWNAV subfolder of the NAV folder located at the top level of the DVD . The edited shotpoint navigation files have had year and Julian day manually entered into each record and are stored in the EDITNAV subfolder of the NAV folder, and the 500 shot interval files are stored in the 500SHOT subfolder of the NAV folder. These files also have year and Julian day manually entered into each record.