Heritage as a public test bench for our measurement chain
image4D measures industrial structures by photogrammetry. Measuring a protected building is the same discipline: same metric scale, same constraints, same method. This is close-range photogrammetry, as opposed to aerial mapping.
An open map of digital representation
This map lists France's historic monuments and the state of their digital representation. In red, the buildings with no representation detected in open sources. That is exactly where a digital twin remains to be produced. Search by postcode, town or position.
How it is built
The data is public. The base comes from the Mérimée database, the official list of protected buildings, open on data.gouv.fr under the Open Licence. We cross it with open sources, Wikidata and the Ministry's Mémoire database, to detect whether an image already exists. The no representation status is an absence of detection, not proof of total absence. The map is regenerated three times a year.
Source
Mérimée database (data.gouv.fr), official list of protected monuments.
Enrichment
Image detection via Wikidata and the Mémoire database. Coordinates filled in where missing.
Update
Automated pipeline, three runs a year. Production code kept in house.
From building to industrial part
A monument and an industrial part are measured at the same scale. The techniques of close-range photogrammetry are identical: multi-view acquisition, calibration, metric 3D reconstruction, deviation control against a reference. The result is a measurable digital twin, whether a listed facade or an engine casing.
Acquire, register, measure, decide. The constraints change with the object. The underlying geometry does not. Heritage is not our market. On objects everyone knows, it makes visible a capability we apply to industrial inspection.