Baseline wandering on ECG is not a cardiac finding and is a concern only for the quality of recording. In brief: ECG. Baseline wandering on ECG is not a cardiac finding and is a concern only for the quality of recording.
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Ground-truthing comes up in the mid-section of the piece. I'm sure this is common parlance for geographers, but ground-truthing is basically a validation process--driving the map to confirm its correspondence to the real (locating attributes, checking them off, tracking the new, etc.).