idea China map offset problem in ArcGIS Pro Ideas https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idi-p/940669 <P>The Chinese government requires foreign companies, such as Google maps, offering mapping services in China to use the GCJ-02 coordinate system which is not compatible with standard universal coordinate systems (WGS-84).<BR /><BR />If you convert ArcGIS boundaries located within China to KML files for importing into Google maps (which some clients require) then the boundaries will be offset by up to 500m depending on the location.<BR /><BR />A way of converting/transforming from WGS-84 to GCJ-02 is required - I believe the algorithm for converting is available from Chinese government (if you are a registered mapping provider - Google must be using this when you import) but is also available on open source communities e.g. Github.<BR /><BR />References:<BR /><SPAN><SPAN><A href="https://en.wikipedia.org/wiki/Google_Maps#Google_Maps_in_China" target="_blank" rel="noopener">https://en.wikipedia.org/wiki/Google_Maps#Google_Maps_in_China</A></SPAN></SPAN><BR /><SPAN><SPAN><A href="https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China" target="_blank" rel="noopener">https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China</A></SPAN></SPAN><BR /><SPAN><SPAN><SPAN><A href="https://github.com/googollee/eviltransform" target="_blank" rel="noopener">https://github.com/googollee/eviltransform</A></SPAN></SPAN></SPAN></P><!-- content transformation source ID: 087E0000000D00X --> Wed, 10 Jul 2024 17:46:30 GMT JamesBourne 2024-07-10T17:46:30Z China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idi-p/940669 <P>The Chinese government requires foreign companies, such as Google maps, offering mapping services in China to use the GCJ-02 coordinate system which is not compatible with standard universal coordinate systems (WGS-84).<BR /><BR />If you convert ArcGIS boundaries located within China to KML files for importing into Google maps (which some clients require) then the boundaries will be offset by up to 500m depending on the location.<BR /><BR />A way of converting/transforming from WGS-84 to GCJ-02 is required - I believe the algorithm for converting is available from Chinese government (if you are a registered mapping provider - Google must be using this when you import) but is also available on open source communities e.g. Github.<BR /><BR />References:<BR /><SPAN><SPAN><A href="https://en.wikipedia.org/wiki/Google_Maps#Google_Maps_in_China" target="_blank" rel="noopener">https://en.wikipedia.org/wiki/Google_Maps#Google_Maps_in_China</A></SPAN></SPAN><BR /><SPAN><SPAN><A href="https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China" target="_blank" rel="noopener">https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China</A></SPAN></SPAN><BR /><SPAN><SPAN><SPAN><A href="https://github.com/googollee/eviltransform" target="_blank" rel="noopener">https://github.com/googollee/eviltransform</A></SPAN></SPAN></SPAN></P><!-- content transformation source ID: 087E0000000D00X --> Wed, 10 Jul 2024 17:46:30 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idi-p/940669 JamesBourne 2024-07-10T17:46:30Z Re: China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940670#M5495 <HTML><HEAD></HEAD><BODY>We (Esri-Redlands) are aware of the issue and are in discussions with Esri-China about possible solutions. The "eviltransform" solution on github is not accurate enough to match many of our online data. Besides, implementing a nonofficial solution like that would be illegal, wouldn't it?<BR /><BR />I'll add a comment with the bug/enhancement number once I have one (it has only an internal number currently). With that you can check its status. <!-- content transformation source ID: 00aE000000Dd6Fu --> </BODY></HTML> Tue, 25 Aug 2015 16:46:19 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940670#M5495 MelitaKennedy 2015-08-25T16:46:19Z Re: China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940671#M5496 <HTML><HEAD></HEAD><BODY>And the enhancement/bug number is BUG-000090251. <!-- content transformation source ID: 00aE000000Dd6bb --> </BODY></HTML> Tue, 25 Aug 2015 17:03:05 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940671#M5496 MelitaKennedy 2015-08-25T17:03:05Z Re: China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940672#M5497 <HTML><HEAD></HEAD><BODY><P>Cannot find this BUG report</P></BODY></HTML> Wed, 22 Feb 2017 12:19:09 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940672#M5497 wbb 2017-02-22T12:19:09Z Re: China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940673#M5498 <HTML><HEAD></HEAD><BODY><P>I can, but I'm internal. It's on hold as we were not able to find a mathematical solution easily and Esri-China was going to do some work on their end for it. I haven't heard anything for at least a year.</P><P></P><P>Melita</P></BODY></HTML> Wed, 22 Feb 2017 21:14:34 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940673#M5498 MelitaKennedy 2017-02-22T21:14:34Z Re: China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940674#M5499 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>is there any update on this bug?</P></BODY></HTML> Wed, 09 Aug 2017 20:32:38 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940674#M5499 NeilFarricker 2017-08-09T20:32:38Z Re: China map offset problem https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940675#M5500 <HTML><HEAD></HEAD><BODY><P>I've heard nothing from Esri-China.</P></BODY></HTML> Wed, 09 Aug 2017 22:27:40 GMT https://community.esri.com/t5/arcgis-pro-ideas/china-map-offset-problem/idc-p/940675#M5500 MelitaKennedy 2017-08-09T22:27:40Z