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Thread: Google Earth GPS Tracking Solution

  1. #191
    Banned RPM_VR4's Avatar
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    Well, eventually we need a lot more screens. There's the OSK png I need, maybe a list of 8 or so layers to toggle. For the OSK, you need to leave an area blank in the upper left where GE's edit-box is (when the left-bar is open). I'm not far enough along yet to start requesting every screen I eventually want though .

  2. #192
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    I have a weird issue in that this seems to lag behind hte actual position of the car. I just wanted to ask if others have this issue. When I use GPS in MS S&T it is right about on where I am at the time. When I use WW it is slightly behind, but google earth is like a block behind when I am only going 40mph. It also seems that update thing does nothing to ameliorate the problem. In fact it seems as though a refresh of 2 seconds is no better than 5. Is there a minimum time for updates or something?

    Thanks

  3. #193
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    The problem you are running into, sxott, is that Google Earth has to use a network link as a pass-through for the data from GPS device. As a result, no matter what, you are going to get a lag between what the GPS device is reporting and what shows up in Google Earth.

  4. #194
    Banned RPM_VR4's Avatar
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    Yeah, but a full block? EB/GE only lags behind my car about 1/8 of a block.

  5. #195
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    Is anyone willing to help me get this set up with CF 1.5?

    Ive read the thread, and Im still a bit confused.

  6. #196
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    I think it depends on the size of the block Anyway that makes sense and perhaps that is why changing the update timing did not seem to affect it.

    World Wind might not lag as badly b/c it says "Problem connecting to network, will try again in 2 minutes" So maybe it uses cache directly thereafter.

  7. #197
    Newbie millc5's Avatar
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    Quote Originally Posted by sxott
    I think it depends on the size of the block Anyway that makes sense and perhaps that is why changing the update timing did not seem to affect it.

    World Wind might not lag as badly b/c it says "Problem connecting to network, will try again in 2 minutes" So maybe it uses cache directly thereafter.
    Sxott, I posted in another thread that based on speed and heading one could extrapolate the location you would be at 2 seconds or so ahead of your reported location, no one responded so I guess its not as easy as it seems to a non-programmer like myself...

  8. #198
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    That's not a bad idea at all. In fact, even if the GPS loses sat fix, an app could just "assume" you are going the same direction/speed and calculate a best-guess location. It would be kind of like a software dead-reckoning solution.

  9. #199
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    My Holux GPSlim 236 actually does that automatically. If you are moving at, say, 60 MPH and it loses satellite signal, it assumes you haven't come to an inertialess dead stop just because it can't detect satellites. Instead, it just keeps reporting you moving at the same speed and vector for a while until it picks a satellite signal up again. This is great when you hit a tunnel and lose signal. Additionally, if it has a 3D fix and loses enough signal to drop to a 2D fix, it is smart enough to assume you haven't just dropped several hundred meters in one second, and keeps you at the same altitude until it has a 3D fix again. Not bad.

  10. #200
    Variable Bitrate davidhite's Avatar
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    It really depends on your entire system - from GPS to display. I had to do some unusual optimization to get GooPs to be somewhat close to real-time. It's now between one half to one second from the time the nmea string is received by GooPs to when it actually shows up in Google Earth. I also did some tricks like projecting the cursor beyond the actual location to make it appear that it is where you currently are.
    The lag is also more apparent the more "zoomed-in" you are.
    Quote Originally Posted by sxott
    I have a weird issue in that this seems to lag behind hte actual position of the car. I just wanted to ask if others have this issue. When I use GPS in MS S&T it is right about on where I am at the time. When I use WW it is slightly behind, but google earth is like a block behind when I am only going 40mph. It also seems that update thing does nothing to ameliorate the problem. In fact it seems as though a refresh of 2 seconds is no better than 5. Is there a minimum time for updates or something?

    Thanks

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