When you go by a large train station in Japan in Google Maps, you can see that it, along with its surroundings, is often heavily colored (see this example, another example).

First example

I would like to know whether this is more of a national convention, something specific to Google Maps or simply something done by the transport authority?

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    Red= underground shopping area. Orange and yellow= see this Google blog Areas of interest. – Kazuhito Jul 9 '17 at 7:22
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    @Kazuhito I think your suggestion should be converted in an answer. – mgri Jul 9 '17 at 9:45
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    I'm voting to close this question as off-topic because it appears to be a general geography/cartography issue, not GIS-centric. – Vince Jul 9 '17 at 15:44
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    @CécileBertau, the best way for saying thanks here is accepting the answer you found as the most useful for solving your issue. – mgri Jul 9 '17 at 18:47
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    I understand OP is not satisfied with the answer. A confusion here is the historical background (data origin) and how it was implemented in Google's API. I can add some pointers if needed. – Kazuhito Jul 10 '17 at 1:55
  • Red: Underground shopping area
  • Orange and yellow: see this Google blog Areas of interest

Red is not shopping area. Red is station undeground area together with all station exits. Still you can find some shops in thick part but rare. Especially it's impossible to find any shops in narrow red parts. You can check that info comparing map from Higashi Ginza station to Otemachi station through Ginza, Hibiya and Tokyo stations with this video. There are some shops but mostly it's just a passage way.

Dark red parts are pedestrian bridges over the ground overlapping underground ways. You can see them if switch to 3D view.

Yellow are major roads but it can be buggy in different zoom levels.

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