Photogrammetry & other specific works

Photogrammetric surveys

Photogrammetry, in particular through the correlation of digital images, makes it possible to carry out measurements on series of images, using the parallax obtained between aerial or terrestrial photographs taken from different points of view. This technique relies on rigorous modeling of image geometry to obtain an accurate 3D digital model of any kind of natural or artificial object.

It makes it possible to reconstruct an exact 3D copy of natural and artificial objects. Thanks to our expertise in georeferencing, image interpretation and mapping, we provide all of these services, from taking pictures to carrying out the final mapping.

Orthophotographs

Orthophotographs, a.k.a. orthophotos, are aerial or terrestrial images (for facades of buildings or monuments) geometrically rectified by removing all parallax and perspective distortions.

These can be series of images assembled in the form of slabs covering a more or less extensive area depending on the desired scale, and which can be georeferenced in any coordinate system, from installed control points and measured on the ground. The straightening of the images allows each point of the orthophoto to be superimposed on the corresponding plane. In other words, an orthophotograph appears to be taken vertically from all the points it figures, these points being located on perfectly flat ground.

The use of photogrammetry makes it possible to obtain what are called true orthophotos, from a Digital Surface Model (point cloud) integrating the altitude of all the points of the images, obtained by laser scanner measurements or by drone depending on the situation.

We have specialized since 2012 in photogrammetry and the production of quality orthophotographs to the applications of surveyors, architects and archaeologists.

Quarry surveys

We carry out surveys of quarries (opencast or underground) for the operating companies, with or without cubature calculations of the extracted volumes.

Sewerage surveys

We also carry out surveys of existing sewerage systems for public authorities or public utility providers.

Cemetery plans

We update cemetery plans for local authorities, with the implementation of appropriate management tools, if necessary, numbering of concessions, establishment of concession registers, etc.

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All of these are part of a non-exhaustive list of our areas of expertise.