Sur la route des « Sites éternels »

The objective is really to develop the technical means
to preserve the memory of sites that are disappearing every year. I’m currently in Tehran. I’m just back from Pasargadae,
where we’ve been doing a survey over the last few days. I’m preparing to go to Alamut, a citadel north of Tehran. Our objective on these two sites
was to carry out highly precise 3D digitisation to enable scientists to study them more precisely and also
so that we have a picture of the way the sites looked in 2016. We haven’t come to Iran
in response to an emergency as we’ve done before in Syria and Iraq. We’re very interested in this country. Its heritage is very rich
and not very well known. Our specificity is that we work with a tool box that’s very complete,
with fixed-wing drones which are accurate up to 2 or 3 cm, multirotor drones, which can go down to 0.5 cm accuracy. To get even more precise elements we take photographs from a monopod, and photographs on the ground. We have vast algorithms so we can process everything
in the same 3D environment to create a model that, in the end, will be able to show in the most
photorealistic way possible what we see before us on the ground. Every day’s different. Depending on if there’s any sun, if there any snow, if it’s cloudy, because when
surveying monumental architecture, it’s better not to have any sun, so there aren’t any shadows
and we can create a homogenous reconstruction. For example, over the past few days,
when we were there, we started doing the survey,
it started snowing, and the snow acted as an amazing indicator of the walls,
a whole plot of buildings, for which we previously had no plans. Usually, on a 10-day
assignment like this, we can easily spend
a month doing calculations to get a result that’s really
satisfactory, a little bit like the results you can see
at the Grand Palais exhibition. The role we play in this exhibition is that of go-between,
passing on information about the sites and environments
we’re lucky enough to visit, and want to pass on
in a much bigger way. Subscribe
to the Grand Palais channel here. Find out more about the exhibition here.

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