The Google Earth placemarks and drawing tools assume that whatever you are marking or drawing is in a fixed geographical location. Although you can move individual placemarks or individual points on a polygon or path, you cannot move multiple items at once, or even move a whole polygon or path.
To use it, simply create a placemark nameed ‘from’ near the objects you want to move. Then create a new placemark named ‘to’ where you want them all moved to. Then save them all, including the new placemarks a KML file. Upload it below and click ‘Translate’. It should download a new KML file with all your placemarks, paths and polygons moved to the new location. The way it works, is it calculates the distance and bearing from the ‘from’ placemark to each latitude and longitude pair in the KML file. It then calculates the same distance and bearing from the ‘to’ placemark and moves the latitude and longitude pair to that location. So everything is moved in relation to the ‘to’ and ‘from’ placemarks. This avoids the distortion you would expect if you simply add a fixed amount to the latitudes and longitudes.
Rotation is achieved via two possible mechanisms. The easiest is to simply type in the rotation angle below. Alternatively, create two paths labelled ‘from’ and ‘to’ with just two points each and include them in the KML file. The tool will work out the angle between the two and use that as the rotation angle. So, for example, if you want to move a set of placemarks from one airport to another while maintaining the alignment with the runway, you put the ‘from’ path along the runway of the airport you are moving from and the ‘to’ path along the runway of the airport you are moving to, and everything should line up. The point of rotation is the ‘to’ placemark.
Optionally rotate clockwise by:
Create ‘from’ and ‘to’ placemarks.
Everything is moved relative to the ‘from’ and ‘to’ placemarks.
‘From’ and ‘to’ guidelines let you rotate and easily line up with geographic features.
Remember that the translation and rotation are still relative to the placemarks. The guidelines only determine the angle of rotation.
If you put the ‘from’ and ‘to’ placemarks in the same spot you can rotate around that point.
If you find any bugs, or have suggestions for further enhancements, please let us know in the comments.