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Google Maps in China seem off

Started by Buffaboy, September 26, 2015, 07:38:04 PM

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Buffaboy

For the first time in a long time, I took Google Maps into China, and I noticed that the imagery did not match up with the roads, for example: https://www.google.com/maps/@39.5936074,116.772858,1347m/data=!3m1!1e3. Why is this?

Edit: And contrary to what it may seem, a site called Tecent has street view available for most of China. Just browsing around the highway systems don't seem much different from those in the U.S. They drive on the right, there's toll roads...
What's not to like about highways and bridges, intersections and interchanges, rails and planes?

My Wikipedia county SVG maps: https://commons.wikimedia.org/wiki/User:Buffaboy


vdeane

It also appears that Google tends to delete roads on the Chinese borders, in particular the border between mainland China and Hong Kong.  The North Korean border, however, sees a zillion roads added.
Please note: All comments here represent my own personal opinion and do not reflect the official position of NYSDOT or its affiliates.

SignGeek101

Could be the satellite view be somehow off? I don't know what to believe anymore  :no:

jakeroot

It's been slightly off for a long time (for at least a few years). I'm sure there's a political explanation for it.

Chris

It is due to a different geodetic system. Google uses WGS 84, while China uses GCJ-02. Overlaying them results in an offset.

https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China#GCJ-02

webfil

Well the choice of a geoid model over another is quite a good political explanation, as technocratic as it gets.

vdeane

Still curious what's going on with all the extra roads here: https://www.google.com/maps/@40.1065832,124.3850145,15z

Here's another oddity.  Looks like Google just started deleting things when they crossed over into Hong Kong.
https://www.google.com/maps/@22.5141966,114.075532,15z
Please note: All comments here represent my own personal opinion and do not reflect the official position of NYSDOT or its affiliates.

english si

Quote from: vdeane on September 28, 2015, 01:21:30 PMHere's another oddity.  Looks like Google just started deleting things when they crossed over into Hong Kong.
https://www.google.com/maps/@22.5141966,114.075532,15z
That's applying standard projection to Hong Kong, and where stuff falls over the border from China, but boy it looks odd.

CNGL-Leudimin

China and their things. If the government doesn't like anything, they block it. This has happened with Twitter, and in response I've set up a counter-block, I refer to China as an 'unknown land'. However, I was able to bring Shanghai back to known lands due to its metro serving as the base for a fictional one, and now I refer to as Dairon. But only in Twitter. Elsewhere, I still refer to them as China and Shanghai, respectively.
Supporter of the construction of several running gags, including I-366 with a speed limit of 85 mph (137 km/h) and the Hypotenuse.

Please note that I may mention "invalid" FM channels, i.e. ending in an even number or down to 87.5. These are valid in Europe.

Buffaboy

What's not to like about highways and bridges, intersections and interchanges, rails and planes?

My Wikipedia county SVG maps: https://commons.wikimedia.org/wiki/User:Buffaboy



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