Each binary processed data file consists of a file header and one or more records as shown in Figure A1 . Each data acquisition consists of a data block containing four pieces of data. Header information consists of various data types which can be accessed by knowing byte location within the particular header. Each character is one byte long. Start of 1st Record Byte location describes the number of bytes from the beginning of the header at which the particular element is located.
Records is the number of data records contained in the file.
Bands represents the number of different DGPS frequency bands measured. Band Location is an integer array representing the particular frequency bands actually measured. It also represents the total number of noise data points as described in the record header. Minimum Sweep Spacing represents the minimum possible time in seconds between each data acquisition or data block within a frequency band. In actuality, the time between acquisitions may be longer than this.