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Thread: RR and Windows 7/8 Location/Sensor API

  1. #21
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    Sounds like maybe you need a method for determining which GPS sensor is more accurate and use that. May require a new "tool" to accomplish this...

  2. #22
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    Quote Originally Posted by redheadedrod View Post
    Sounds like maybe you need a method for determining which GPS sensor is more accurate and use that. May require a new "tool" to accomplish this...
    That's an interesting idea, and one that's (on its face) is not too hard to accomplish. But it would still come down to a "best guess" at any given moment.

    Scenario:

    GPS "A" has a mediocre HDOP value, but an excellent VDOP. I'm going to assume its aggregate positional accuracy is some average of the two values.
    GPS "B" has a better HDOP value, but lower VDOP. It's aggregate value is slightly lower than GPS "A".
    Which device do you use? "B" will actually provide you with a better location on the ground, but it's overall accuracy is not quite as good.
    And of course, all of these values change from moment to moment. On average, "A" may provide a better overall accuracy than "B". But how long do you wait for that average?

    That said, since we're making a comparison between an external GPS and an internal GPS/GNSS sensor, You're going to go with the external all the time anyway. It's very likely to have better accuracy than the internal for no other reason than a bigger/better antenna. And why would you put it on there in the first place unless you expected better performance?

  3. #23
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    I have no idea honestly the way that Win8 decides on / uses it's internal GPS (sensor), or one that has been plugged in (and drivers installed).

    Windows, as you mentioned, most certainly will not use a device if the drivers are not installed. As with any device, plug it in, provide the drivers and it will then be installed for any software to make use of it when it is needed. In the case of a GPS device, plug it in, install the drivers. Then when you launch iGuidance, MapPoint ect, it will "sense" the GPS and use it.

    I just know from experience that IOS and Android will automatically override the internal GPS when a blue tooth GPS is connected. I used to use TomTom on my old iPhone, and the GPS reception was pretty bad (As well as TomTom I soon found out). I purchased a Bluetooth GPS, and soon as I paired it with my iPhone, the iPhone automatically used it as it's source. There is no way on the iPhone to actually "choose" a GPS device. When I powered off the BT GPS, it reverted back to the internal sensor automatically.



    Given all of that, I was just making an ***umption ( ) that windows MAY do the same thing.
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  4. #24
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    And I wasn't precise in my explanation either Two drivers here: The actual hardware driver, just as you described, which connects the device to Windows. That works just like it always has. plugin a device, let windows find a driver or provide one, and there you go. But the Windows Location platform requires a SECOND type of driver, known as a Sensor Device Driver, in order for the Location platform to "see" the hardware device you just connected. So while any of your normal GPS apps would be able to connect to the external GPS straight away once driver 1 is installed, the location platform won't be able to use it until driver 2 is loaded. Goofy, I know.

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