Hi, I’m really wanting to have better accuracy from GPS for use with Openstreetmap. I can use survey marks and a laser rangefinder, but having a portable GPS would make so much easier to fix errors where objects have been armchair mapped or even GPS mapped with errors up to 3 meters.
I have tried three approaches * QZSS – I can see this on my Android mobile phone but it doesn’t seem to be used. It seems as though I need a Japanese market device and even then I’m not sure I’ll get an increase * Galileo – looks promising but when I’ve tested on supported devices (friends who have recent phones) the accuracy isn’t delivered. Further investigation shows that there aren’t enough satellites in service yet most of the day to give 4 visible. (Using GNSS View http://qzss.go.jp/en/ English text) * Lastly the SBAS trial from Geoscience Australia - http://www.ga.gov.au/scientific-topics/positioning-navigation/positioning-for-the-future/satellite-based-augmentation-system - nothing magical has happened with any of the consumer grade devices I have access to. Also not sure how to test on an Android device if it is being used. Has anyone obtained sub-meter accuracy from any of these approaches, it must be possible? Please discuss. Alex
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