/maps/community?hl=en
/maps/community?hl=en
9/20/09
Original Poster
谢林

wrong position offset between satellite pictures and local map in Shanghai China

Hi,

search in google maps for:
91号 赤峰路, Yangpu, Shanghai, 上海市, China
which will point at a famous road in Shanghai.
Now switch between Satellite images and painted map. Notice the difference?
Using Ubuntu Firefox 3.5 I notice an offset of about  500-600 meters. The addresses position fits correctly at the map but is
 wrong at the satellite image.

Can you confirm if that is a bug?

thx,

谢林。
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All Replies (7)
ehg
9/20/09
ehg
its a well known and often reported problem happen in all the browsers I beleive,.
just search the forum for offset china map or offset shanghai
jfujita
3/23/10
jfujita
Is something going to be done about it?  I'm building an iPhone application that uses the iPhone SDK which uses google maps as its map data provider) and as such suffers from the same inaccuracy.  The iPhone has been sold in China since late last year... So what is going to be done about this well known bug?
3/23/10
Original Poster
谢林
use
www.ditu.google.cn
for China instead.

hustmobile
7/24/10
hustmobile
For iPhone,if you want to solve the China maps misalignment issue. Try
ABCMaps applciation.
http://itunes.apple.com/us/app/abcmaps/id379582726?mt=8
 
In China, the built-in iPhone Maps application is distorted and will
show you a position that is 300-1000m randomly from reality. The
ABCMaps application is to align the maps to the real place.
 
ABCMaps is Chinese only applcation now. However, it is so easy to use.
So even you can not read Chinese you can use it also. The English
version will come out in the future.
hustmobile
8/11/10
hustmobile
ABCMaps is upgraded to version 1.30, English support added.
http://itunes.apple.com/us/app/abcmaps/id379582726?mt=8
Find out where you are really in China. If you travel in China,
sometimes you will be troubled by China maps offset. The ABCMaps application is to align automatically the maps to the real place .
If available in your area, real-time traffic conditions will be
displayed over the road as color-coded lines by click "Traffic" button.
 
What's New In Version 1.30
1. English support added
2. Traditional Chinese support added
3. Small bug fix for iOS 3.0
tvnewswatch
4/14/11
tvnewswatch
Interesting discussion here. However there are issues that go further than just the iPhone.
 
On the Nexus One [HTC] Google phone there is also an occasional offset issue.
 
In Beijing it is generally accurate to within a few metres. However in other parts of China there seem to be offset issues. After crossing the border from Hong Kong [where everything was perfect] and into Shenzhen the offset was at least 100 metres off. The GPS locator showed one's position as being way off the road one was on.
 
The offset as sometimes appears in mobile apps is very similar to that seen in Google Maps on a PC/Mac. The overlay of roads on the satellite view drops out after a certain level, but buy flipping between the two of overlaying the transport/metro system it can be seen that there is an offset of several metres.
 
To be specific the offset is 530 metres NEE [approx 60 degrees] between the Street Map position and the Satellite View position.
 
This issue definitely appears to be China specific. Overlays are perfectly aligned even in countries like Burma [Myanmar], but on crossing the Chinese border the discrepancy occurs. It is likely that this is all part of the Chinese authority's 'war on Google' and is not likely to get any better. Google has apparently failed to obtain a licence for its mapping service, a requirement set in 2010, and looks set to be blocked on May 1st.
 
As regards a solution, there is unlikely to be one other than to use another mapping provider.
pmoz
6/1/11
pmoz
The reply by tvnewswatch matches my experience. Definitely not browser-related, as exactly the same problem in my HTC Desire and on Google Maps on the PC. In Shenzhen the roads are offset about 600m ESE from the Satellite image. This location displayed properly earlier this year.
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