Your photogrammetry expert in Reunion Island

What is photogrammetry ?

Photogrammetry is the science and technology used to obtain an accurate representation of an extended territory or object from a series of photographs. Photogrammetry can either be aerial or terrestrial. It allows to create topographical plans, digital terrain or surface models in some cases, georeferenced point clouds and orthophotos.

Formerly restricted to the military use, drone use is now accessible to numerous civil applications. In our field, drones are a tool of great efficiency, in photogrammetry in particular. Equipped with high-resolution cameras and image processing softwares, we are able to conduct the 3D modeling of spaces with centimeter level precision.

Drone use also allows us to avoid the use of cherry pickers for inaccessible areas. It is possible to film or shoot the object closely to examine roof damages or issues on inaccessible structures.

The processing of collected data allows us to create classified point clouds, orthophotos, digital surface models and in some cases digital terrain models. This method is very efficient, particularly for quarry surveys, as it saves us a lot of time. If the area is vegetation-free, we will then be able to create a digital terrain model.

In order to conduct a photogrammetry project and achieve the results needed by the client, we need to take into account several parameters :

1. Technical feasibility

   Firstly, we need to evaluate the legal feasibility of the aerial survey project. Depending on this factor, the sensor can be embarked either under a drone, a helicopter or an ultra-light aircraft. The flight constraints are different for each type of aircraft.

2. Flight and recording parameters

   Secondly and based on the clients objectives in terms of resolution and precision, we will define the flight and recording parameters of the project and report the intented flights to the authorities.

3. Photogrammetric processing

   Finally, we will proceed to the photogrammetric processing of the photos and georeferencing of the model obtained using the methods employed by the land surveyors.