in photos if location coordinates are zero cannot edit them
I have upgraded to El Capitan and hence photos.
After importing my iPhoto8 libraries I find that where the location was defined as a user place the coordinates are set to zero and the pin is positioned at the Greenwich meridian on the equator. However, photos is stuck in a loop searching for location information for this point so I can neither edit nor move the pin to the correct location.
How can I reset the location information?
I am unable to run iPhoto8 and iphoto9 is no longer available.
MacBook, OS X El Capitan (10.11.6)