Yes, this. I&#x27;ve had to deal with inter-datum conversions in the past, and as far as I can tell, though after a <i>very</i> brief review, GCJ-02 is just another datum, albeit one not well documented. The &quot;random offset&quot; described in various documents may be easily explained by the datum being optimized for accuracy in a relatively small area, and thus errors increase as you expand your mapped area.<p>(For those who don&#x27;t speak GIS, datums are essentially a way of mapping an orange peel to a table; because any attempt to dedimensionalize points on a sphere must by necessity introduce errors, datums are designed to either minimize that error in all locations -- which is what WGS84 does -- or to gain greater accuracy by focusing on a smaller part of the globe, such as the &quot;state plane&quot; datums. When you see misaligned points on maps that derive data from various sources, it&#x27;s usually a good idea to make sure that multiple unconverted datums aren&#x27;t the source of the problem.)