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MRKisThatKid
Hi, I've geocoded some images using a gpx file, and then done reverse geocode to fill in the city and so forth.

Unfortunately it seems to be mixed up.  Here is an example coordinate...
53.348980, -1.503790
It has been written as...
City: Norton
Province: Sheffield
Country: United Kingdom

But actually the city should be Sheffield, and Norton is only a small district of Sheffield.  (and this coordinate isn't even Norton, it's Millhouses)

Getting the city in the wrong field is quite a big deal

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houdah
Hi!

Which service are you using for reverse geocoding?

Google Maps should produce the better results.

Best,
Pierre Bernard
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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MRKisThatKid
Sorry, I hadn't noticed the choices.  However it was already set to Google Maps.  GeoNames gets an even stranger result...

City: Nether Edge
Province: England
Country: United Kingdom

I guess none of these services understands the UK   But back to the Google Maps result...  as you can see, Sheffield is most definitely the city...
http://en.wikipedia.org/wiki/Sheffield

If Google Maps is consistently wrong for UK addresses is there any chance you could implement some kind of experimental fix?

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houdah
Hi!

The results I am getting from Google Maps are:

[CODE] {
AddressDetails = {
Accuracy = 8;
Country = {
AdministrativeArea = {
AdministrativeAreaName = Sheffield;
Locality = {
LocalityName = Norton;
PostalCode = {
PostalCodeNumber = "S7 2";
};
Thoroughfare = {
ThoroughfareName = "1-49 Dewar Dr";
};
};
};
CountryName = "United Kingdom";
CountryNameCode = GB;
};
};
ExtendedData = {
LatLonBox = {
east = -1.5006274;
north = 53.3522731;
south = 53.3459779;
west = -1.5069226;
};
};
Point = {
coordinates = (
-1.503775,
53.3491255,
0
);
};
address = "1-49 Dewar Dr, Norton, Sheffield, UK";
id = p1;
}[/CODE]

Google Maps indeed thinks the address is "1-49 Dewar Dr, Norton, Sheffield, UK".

Interestingly enough, the coordinates show well outside Norton an the[URL=http://maps.google.com/maps?q=53.3491255+-1.503775&ie=UTF8&ll=53.349117,-1.503754&spn=0.063942,0.178528&t=h&z=13&iwloc=addr] Google Maps web site[/URL].

Then again, it got the street name right.

I wonder what is going on here. I would however be surprised if Google Maps got it wrong for all of the UK.

BTW, what would the state/province name be for that area?

Best,
Pierre Bernard
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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houdah
Hi!

I found an [URL=http://groups.google.com/group/Google-Maps-API/browse_thread/thread/3ed247270264ed0b/b9b149dd8abd88e2?lnk=gst&q=uk#b9b149dd8abd88e2]interesting discussion[/URL] in the Google API group.

Mapperz writes:
[QUOTE]The bottom line is that UK Postcodes and UK Addresses Location data is
held down by 'Crown Copyright'
Royal Mail and Ordnance Survey have the data copyrighted and want a
return on using this.
If you brought the Codepoint dataset (UK Postcode Points - 1.7
million) it costs (rule of thumb here) 0.01p per postcode
so that's £17k alone
Address Point (csv format) has all 28.3 million addresses in the UK.
(again rule of thumb) 0.05p per address
yes ouch, £1.4m (yes mapperz knows that is reduced price after 500,000
points or so).
oh, and if you want this data available on the internet - you have to
'pay per click' which is even more.
[/QUOTE]

Best,
Pierre Bernard
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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MRKisThatKid
Damn that's mental, how can you copyright place names, sheesh.

I'd say the state/province is South Yorkshire, although technically it's a county, I guess that's what we have instead of states.
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houdah
Hi!

I did quite some reading up on this.

Seems like nothing can be done to improve upon the current situation. Sorry.

You'll notice that "South Yorkshire" does not even show in the results returned by Google Maps.

Best,
Pierre Bernard
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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David_Edge
To MRK

You cannot copyright a place name but you can copyright a book - ie the work you put into collecting the words in that order! Whether the total benefit to your society is greater from making data freely available or charging for it in a way that only global businesses can afford it is not a  matter for this forum!)

As for the City=Norton thing, I wonder if this is a problem with the difference between US and European usage:

- US 'City' = settlement larger than a hamlet

- Europe 'City' = settlement with a train with first and second class at least every hour running at 100mph+

Not formal definitions, but I hope they illustrate the huge difference in meaning of an apparently similar word!

orrabest

David Edge (who has just discovered that the National Portrait Gallery is in Seafield not, as he had rather imagined, Edinburgh!)
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