[CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread Matthias Lankhorst
Dear CF, I have oceanographic data from IES instruments (inverted echo sounder) that I would like to publish via OceanSITES in a CF-compliant form. The data in question are acoustic travel times from the echo sounding device. This means the time it took for the acoustic signal to run from the i

Re: [CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread Lowry, Roy K.
Dear All, Of Matthias's suggestions I have a strong preference for a slight extension of roundtrip_acoustic_travel_time_in_sea_water, namely acoustic_signal_roundtrip_travel_time_in_sea_water. 'two-way' is a possible alternative to 'roundtrip' but I think the former carries unfortunate seismic

Re: [CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread John Graybeal
+1 for Roy's choice. Can you explain the following for the acoustically naive? "I assume the data would need some additional description to denote the vertical extent of the measurement, such as cell_bounds and cell_methods='Z:sum'." John On May 30, 2013, at 06:45, "Lowry, Roy K." wrote: > D

Re: [CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread Lowry, Roy K.
Hi John, Not exactly. The travel time in both water column echosounding and seismics is a proxy for distance and therefore provides information on the vertical distribution of returned signal intensity. Cheers, Roy. From: John Graybeal [grayb...@marine

Re: [CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread John Graybeal
Let me rephrase my question as a statement. I didn't understand Matthias' original statement about denoting the vertical extent of the measurement (to me, a naive viewer, travel time is simply travel time, and I don't need to understand the vertical extent of the measurement to interpret the nu

Re: [CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread Matthias Lankhorst
Hi, thanks already for these comments. Roy's suggested name sounds pretty to my ears. Trying to explain my "cell_methods" thing: The instrument is sitting at a fixed spot on the seafloor, so unlike the echo sounder on a ship, the distance does not change (well, there are tides, but we filter

Re: [CF-metadata] standard_name for acoustic travel time from echo sounder

2013-05-30 Thread John Graybeal
> Bottom line: I need to tell the user what depth range I am covering (0-4500 > or 0-3000), and in my limited understanding of the situation this is done > via the cell_methods and cell_bounds attributes. Right, got it (I think). In your particular use case it's important to describe the depth