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Sightseer
Posts: 2
Please explain what CTS is in the extracted data

Hi,

 

I've just started using a Hero 9 Black and Telemetry Extractor Premium to review the data. I had assumed that "cts" stood for "camera time code", but if so, it doesn't agree with the number of seconds from the GPS data. For instance in a partial data set I get the folllowing when extracting GPS data at the "auto" sampling rate. I'm expecting 18 Hz.

 

Looking at the first two rows, I see .405 to .350 seconds between data points. So that's 0.055 seconds which is equal to 1/18 of a seconds and thus 18Hz. The "cts" values for those two rows differ by 1419.090778 - 1363.716222 = 55.374556. So it looks like cts is time in thousandths of a second. Is that correct?

 

ctsdateGPS (Lat.) [deg]GPS (Long.) [deg]
1363.7162222021-05-28T17:58:05.350Z47.206565-122.4332659
1419.0907782021-05-28T17:58:05.405Z47.2065648-122.4332659
1474.4653332021-05-28T17:58:05.460Z47.206565-122.4332658
1529.8398892021-05-28T17:58:05.515Z47.2065648-122.4332658

 

thanks, Craig

Nomad
Posts: 1,117
Re: Please explain what CTS is in the extracted data
[ Edited ]

Hi Craig,

Yes. It's time in milliseconds.

By default (with Base Time: Auto), the Extractor will use the MP4 data to assign the CTS to GPS samples. If you want them based in the GPS timestamps alone (like the Date field), change Base Time to GPS.

I hope this helps.

Juan

Sightseer
Posts: 2
Re: Please explain what CTS is in the extracted data
Great, thank you!