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Time computation and VMT Excel Output #3
When applying the Flip XS (auto vs manual), the time stamps in the excel file and UTM coordinates are not being handled correctly.
For example, if I export an excel file with the auto XS feature on, I get the boat starting at one end of the line (see attached plot) and if I manually set the start bank, I get the boat starting at the other end of the line. In reality, the boat started offshore at 17:05 on 9/1/15. If set to auto, the flow direction forces the boat to start on the left bank (or nearhshore in this case) at 17:05 on 9/1/15. Therefore, depending on what I choose, my boat can be at two different points at the exact same time.
The time stamps and coordinates must be maintained and sorted as a group to ensure that the time stamp for the observation is accurate. This will especially affect modelers trying to apply these data to a model based on time stamp. In addition, if applying a tide file after export to Excel, we need to ensure the time stamp and bed elevation measurement are true to the data.
The simple work around is to reverse the time stamp vector when writing to excel, but the problem is more pervasive since the correct timestamps are not being maintained with their respective UTM grid nodes in the V structure as stationing is assigned across the channel (I assume).
I have not dug into this and I am not sure I will do that today, but I wanted you to be aware of this.
We might want to find a way to concisely present the issue and post it on the forum as an FYI.
The issue was caused in