questions about the GPS coordinates

[vision-zhao]

I feel a little confused about the GPS coordinates provided in the file 'link_gps'.
I've tried to plot the location of road in the google map, but there existed some offset. Where the ploted points in always seems not like a road. So I'm wondering:
1 what coordinate system are they in?WGS84?GCJ-02?or BD-09 of Baidu?
2 are the gps coordinates given in the dataset aiming at the true road in reality? how can I get the specific road for a pair of gps coordinate?or it need to be kept serect?

Thank you in advance

[bbliao]

@vision-zhao

1. The gps information of the link is extracted from some_name.mif provided by Baidu. The file is started with:

Version 300

Charset "WindowsSimpChinese"

Delimiter "	"

CoordSys Earth Projection 1,0

...

2. Actually, there is another file contains the name of the link. Unfortunately, we can not provide the file for security.
   Thanks for your attention!