Strange 1Hz alt drop to zero while playing back exported KMZ file in Google Earth

Hi, 

I just recorded a 9 min hover in roughly the same spot out to a tlog file and then exported that to a KMZ file.  When I play it back it looks like the altitude recorded jumps to zero on one tracking point per second and the rest appear at the correct hight.  It's like a 1Hz blip in the playback within Google Earth. Since I cannot read the binary tlog file directly I cannot plot the alt to see what's being recorded.

Oddly enough, while I was doing my best to keep the altitude at one spot above the ground I found that once I found a sweet spot on the throttle, all of a sudden the rpm on the engines surges without me making any changes to the throttle stick.  I'm in stabilize mode and do not have a sonar so I cannot see why the code would have any reason to muck around with the throttle being applied to all engines at once. I'm not keen to try alt hold without the sonar (wish it would hurry up in the post!).

The two issue are most likely unrelated but worth mentioning.

Using AC 2.0.37 / Mission Planner 1.0.44

Michael O., if you want a copy of the tlog file I'll email it to you.

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DeveloperPermalink Reply by Michael Oborne on July 26, 2011 at 9:38pm

can you post the log here?
i have a feeling i might know whats going on.
also what did you ahve plugged in?

sonar, gps, etc?

Permalink Reply by John Grouse on July 26, 2011 at 9:43pm
No sonar, just magnetometer and gps.

Note that the logs are doing nothing for the first few minutes as I had to carry the quad downstairs and then plug it in again outside. At the end of the log it is back on the ground, unplugged and then a few minutes before I stop logging on the laptop.
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DeveloperPermalink Reply by Michael Oborne on July 27, 2011 at 2:17am

There is nothing wrong with the kml or your log. it actualy a google earth problem. the reason is because it thinks the height in the log is bellow ground level in google earth. so it jumps, theres nothing i can do im afraid.


DeveloperPermalink Reply by Michael Oborne on July 27, 2011 at 2:19am

if you right click the path in ge and proprtys > altitude > change to relative to ground you can see the path. but you cant do the same for first person view.

Permalink Reply by John Grouse on July 27, 2011 at 2:41am

Thanks for looking into it Michael.  I'll assume this won't be a problem when I get around to flying it up much higher than a few meters off the ground.

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