View Issue Details
|ID||Project||Category||View Status||Date Submitted||Last Update|
|0000791||GeoSetter||User Interface||public||2011-04-02 18:35||2023-02-25 12:33|
|Product Version||3.4.14 Release|
|Target Version||Fixed in Version|
|Summary||0000791: Enhancement request: ability to offset maps to counter misalignment in places like China|
|Description||Google maps (satellite and street) are misaligned by 300-1,000m in China. The misalignment can be to a different distance and direction between the satellite and street maps. The amount of this misalignment changes in different parts of China, and also seems to change over time. |
I have photos from Shanghai that I positioned two years ago that now appear in a different location on the map! I have photos from my iPhone 4 (built-in GPS) that are in the wrong location on the map. This makes setting the GPS coordinates of photos from my Canon 500D (no GPS) rather inaccurate.
You can also Google for this problem, where you will read that people have no problems with GPS mapping in Hong Kong instantly have problems when they cross the border in to Shenzhen.
My enhancement request is:
1) An ability to automatically correct the error in the UI so that picking the location via street or satellite view adds a correctional value to the coordinates provided via what I presume is Google's mapping API
2) If this can't be done automatically (presumably that would require a database of up-to-date coordinates), then provide the ability in the UI to calculate the misalignment using a reference image. For example, if I have a photo from my iPhone, show it on the map, then ask where it really is (both street and satellite views). With that delta, either have a way to add the delta to subsequent photos that are positions via the map service, or shift the map in the UI by that delta so that the user gets the correct coords when they position a photo.
|Tags||No tags attached.|
|Please contact me if you want some reference photos that you can use as test cases. I can probably place them to 5-50m, which is better than the Google's error.|
This is an issue covered in Google forum:
It seems that satellite maps are correctly aligned but not terrain or street maps.
Strangely, it has been reported that using the mapping service of google.cn instead of google.com produces correctly aligned maps.
A potential solution, my guess, is to add google.cn to Map Type drop down list.
Information about converting between China's coordinate system (GCJ-02) and GPS coordinates:
|2011-04-02 18:35||Malcolm_Ferguson||New Issue|
|2011-04-02 18:39||Malcolm_Ferguson||Note Added: 0001538|
|2011-04-23 19:21||bupar||Note Added: 0001551|
|2011-04-24 01:12||Friedemann||Status||new => assigned|
|2011-04-24 01:12||Friedemann||Assigned To||=> Friedemann|
|2023-02-24 23:35||Malcolm_Ferguson||Note Added: 0004653|