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GPS Projection and Delta Error

This is a discussion on GPS Projection and Delta Error within the MapPoint Desktop Discussion forums, part of the Map Forums category; Hi, i've got this problem.. even if i dont know if this is real problem. When i plot points to ...

  1. #1
    Gianmaria is offline Member Yellow Belt
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    GPS Projection and Delta Error

    Hi,
    i've got this problem.. even if i dont know if this is real problem. When i plot points to mappoint sending over his com port from a gps device, or if i use the activex to plot a real time gps device sometimes the point is not on the road but it's on a side, sometimes the "car" moves along the road following the direction but at some distance.. can i do something with this error?

  2. #2
    Winwaed's Avatar
    Winwaed is offline Mapping-Tools.com Black Belt
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    How big is the error?
    Two things come to mind:

    1.) Make sure your GPS is set to use the WGS84 geoid.
    This is what MapPoint uses, as well as the satellites in the GPS network. However, different geoids have their uses, and some GPS devices will report their coordinates using different geoids by default. Most have options so that you can change the geoid.
    Geoid-related errors of 100m or so are easily possible. They will appear to be systematic (similar amount and direction of error, when operating in the same regional area).

    2.) Consumer GPS is generally less accurate than most people assume. This might be your problem if the error varies, the reported position over-shoots when you stop or turn, that type of thing.
    Errors are typically 10m or so.
    They are worse if the receiver does not have a clear view of the sky - eg. hills, buildings, etc. or the position of the receiver/antennae in the car.


    Richard
    Winwaed Software Technology LLC
    http://www.winwaed.com
    See http://www.mapping-tools.com for MapPoint Tools

  3. #3
    Gianmaria is offline Member Yellow Belt
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    Error is in the range you told.
    How can i snap the GPS to a valid position? Is it possible in MapPoint?

    Regards

  4. #4
    Wilfried is offline Senior Member Black Belt
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