In RAMAC GPR terminology, each line of data in the horizontal dimension is considered a single "trace" of data since it represents the data traced by radar pulses for that particular distance along the x-axis. The last trace represents the total number of pixels in the horizontal dimension and will be used to identify the number of "lines" in ENVI, which confusingly represents the vertical/y-axis dimension of the data in ENVI. (Again, the data will be flipped vertically in ENVI when we first open the file and will therefore require a rotation within ENVI prior to usage.




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