philip dism llman, research director at the cnrs said that will help the architects to understand how the church was built and how to restore it. try to -- f data is hid >> reporter: he is coordinator of the digital data working group. >> by analyzing the thousands of photog photographs. we were able to locate the exact position where each stone has fallen. >> the scientists are work for future generations. building a library of 3d images and plans of the church, then and now. because notre dame is not just a building. it's an integral part of power us. >> i'm a scientist, i look as objective study but i'm from paris, so it's part of amy city and i see it every day. it's a complex feeling. >> reporter: those feelings are widely shared.o cf1 o the fire that ravaged the could cathedral has prompted donations from around the world. macon was at the cathedral at the second anniversary of the fire. and was thanking everyone working on the site. president macron said that he is confident that the five year plan to rebuild it will work. so that oh, it was terrible. i was totally stranded. no