Op 09-12-2019 om 10:17 schreef Grzegorz Adamiak:
I don't know if the China maps from OsmAnd also have this
aberration? Possibly so. In that case it could help to generate
the China map yourself.
Why would it? My expectation OSM for China, or all regions in general,
is produced with same tools and workflows, hence results should be the
same. Unless, of course, a distorted positioning is at the source,
which Beidu is AFAIU. But GPS is working the same round the globe, so
in China it should render the same accuracy as elsewhere. Or am I wrong?
Hmmm.... I was happily typing away in a "type-before-you-think" mode.
When I got corrected by a related Wiki
<https://wiki.openstreetmap.org/wiki/WikiProject_China#Legality> page,
which says:
"/This seems to outlaw the entire OSM project and any participation
or contribution/."
The bottom line: In China you are bound to use maps with the GCJ-02
aberration included. This means that unless you use a routing engine
with the official algorithm supporting GJC-02, you're screwed. Standard
WGS-84 tools will not work.
Unless you want to risk illegal activities such as "fixing" the flawed
algorithm as explained here:
https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China#Reverse_transformation.
But given China's reputation on human rights, I would only give that
advice to my worst enemies.
CP
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