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Regarding reverse geocoding accuracy for the Google geocoding plugin for QGIS, I cannot speak for other countries but the accuracy was very low for some locations I attempted to reverse geocode in Toronto, Ontario, Canada. The same address would be returned for every building in a one block span of a given street or the address range for the block would be returned - all depending on where one clicked. <BR>
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The street number returned for one building, where the correct address was already known, was wrong. Province, city and street were almost always correct but street numbers, as far I as I can confirm, where almost always wrong. Street was incorrect occasionally. Country ID should be very accurate but I would pay close attention to values returned for locations near borders.<BR>
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In case the CRS (NAD83 UTM 17N) was somehow involved, I reprojected to Google Mercator but it made no difference at all.<BR>
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- Dennis<BR>
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On Tue, 2011-11-01 at 13:48 +0000, M.E.Dodd wrote: <BR>
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<FONT SIZE="2"><FONT COLOR="#0000ff">Actually I don’t really understand the api issue as the latest version of the google api says that there is no api key needed.</FONT></FONT><BR>
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<FONT SIZE="2"><FONT COLOR="#0000ff">What I want to do is reverse geocode a large number of lat long pairs, I don’t want to display them particularly and certainly not put them on a website, I am just doing data analysis. I understand there is a limit of 2,500 lat long pairs per day on google, I seem to recall when I looked into this a year or so ago the limit was higher than this. Wonder if there is a way of putting in some kind of batch command that will send this number in per day for a month or so or until all the ones I need to reverse geocode have been done.</FONT></FONT><BR>
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<FONT SIZE="2"><FONT COLOR="#0000ff">This is obviously much slower than using detailed country outlines in the gis to achieve country id for the points. Does anyone know how accurate the reverse geocoded data is for country ID (or the more detailed info on the address), it seems to be very accurate so they must have extremely detailed country outlines, much more detailed than are freely available?</FONT></FONT><BR>
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-- <BR>
The Open University is incorporated by Royal Charter (RC 000391), an exempt charity in England & Wales and a charity registered in Scotland (SC 038302).
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