Drone Digital Photogrammetry

Drone digital photogrammetry is one of the most advanced technological innovations of recent years in this sector. The photogrammetric aerial survey has already existed for a long time, but the surveys with drones have opened up new scenarios, as with them it is possible to get very close and stable to the subject in question.

The photogrammetry with a drone allows access to difficult to reach or inaccessible areas, providing detailed images faster than the best standard methods and lower price.

Drone Photogrammetry

Photogrammetric surveys with Drone

Thanks to drone digital photogrammetry,  you can get more accurate data and save time.

Photogrammetry is a technique whereby it is possible to acquire stereometric frames, then the metric data of a given object, in particular shape and positionIn fact, calibrated cameras are installed on the drone in order to obtain 3D images in post-production.

Therefore, the advantage of drone photogrammetry is that it can accurately evaluate the shape, position and size of the desired object or area. The photogrammetric survey also makes it possible to obtain detailed and complete information in order to limit the time of field investigations.

The technique of drone digital photogrammetry applied wisely with computerized vision methods, results in an intelligent automated processing system.

One that, on the one hand, can be managed by a neophyte in the field of photogrammetry. But on the other, has a lot to offer a specialist who can adapt the workflow to many specific tasks and different types of data.

Through various case studies, Drone Inspections proves to produce accurate and quality results.

Our staff is made up of professionals with experience in the sector, trained and certified, able to guarantee maximum professionalism.

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Drone photogrammetry - What you need to know!

The drone digital photogrammetry allows having metric information of buildings, or other three-dimensional objects, starting from the processing of two or more photographs taken from different points of view, in order to recreate the size, position and orientation of the building or object in question.

It is therefore a real technique of digital photography, in this case with a drone, which can be processed thanks to professional software.
This software (there are several) using aerial shots with a drone is able to detect points in common (called homologues) between all the images that are inserted, on which the point cloud will be built, i.e. a group of points with the characteristic of being positioned through coordinates with precise values ​​associated with them. Using the image obtained with the point cloud, you can process the final digital products.

If you intend to reconstruct the 3D model of an area, or if you need the survey of a building or land, drone photogrammetry is the method you can use instead of using the usual aircraft. people have been using drones for Aerial Surveying and Aerial Inspections for a long time. In fact, aerial photogrammetry with a drone allows you to have lower costs for the acquisition of images for detection.

The applications of drone digital photogrammetry are having a lot of success precisely because of the numerous advantages and very low prices. They are used in different fields such as:

The surveys with a drone, but until recently also the classic aerial photogrammetry offer many possibilities:

  • Creation of territorial and environmental cartographic topo databases
  • Technical cartography
  • Urban planning
  • Forest planning
  • Surveys with a drone for coastal zone management
  • Shooting for urban security activities
  • Videos for promotional tourism purposes
  • Shooting in inaccessible locations due to natural disasters (floods, earthquakes)
  • Surveys with a drone for environmental defence purposes (building abuses, illegal landfills)
  • Surveys with a drone to check the state of the soil, vegetation and water
  • Exploration of quarries and minerals
  • Archaeological footage

These are just some examples of what can be achieved with a drone equipped with an adequate video camera, skilled certified pilots like our pilots and good image processing software.

The goal of carrying out drone digital photogrammetry is to obtain a survey of the building, or of the ground, or of the three-dimensional object, in order to visually explore it in order to get to know it better.

The territorial or architectural surveys carried out by combining the photogrammetry technique with the advanced technology of the drone, allowing you to directly and quickly monitor the state of buildings and land, with extremely precise, centimetre and realistic performances.

To obtain a photogrammetric survey, first, you need to acquire the frames of a building. After the frames are aligned, mesh and textured model processing are performed to finally get the vectorized elevations.
The export formats depending on the type of instrumentation used, therefore, obj, 3ds, dae, ply, u3d, pdf, kmz, but also ASCII XYZ, LAZ, geoTIFF, dwg, shp and others.

The most advanced drones from a technological point of view are able to reproduce Digital Elevation Models, i.e. digital elevation models to be used with geographic information systems capable of producing new data applicable in various studies on the territory or on buildings.

The drones used for the photogrammetry of buildings or land surveys are equipped with a GPS on the ground capable of obtaining RINEX data, therefore they are usually drones that have the integration of two GPS antennas with RTK correction; an RGB sensor; a Lidar; a software for post-production.

These high-tech drones create aerial photogrammetric surveys capable of exploiting the most advanced innovations, such as the acquisition of images by means of dual return lasers.
Due to the type of performance, it is able to obtain, drone photogrammetry is used in many fields, from topography to engineering, architecture, archaeology and even geology.

There are some types of drones that have the integration of APR systems with thermal cameras, capable of obtaining thermal maps of territories and buildings. Often this type of drone is used in engineering, as it allows you to control electrical, energy and plumbing systems.

For architecture, on the other hand, drones are used that have the characteristic of being able to fly very close to the object to be analyzed, therefore dynamic models with a simple structure, with a GPS system for driving that allows the storage of a path and camera.
The integrated GPS system and the ground station control allow the autonomous flight of the drone, which can also be set, using the specific software, for the automatic taking of photographs according to the criteria pre-set by the authorized pilot.

The latter, essential for the creation of 3d maps, are pointed vertically downwards if they are to be used for drone digital photogrammetry, while if the image acquisition involves the creation of 3D models of statues or buildings, the camera must be positioned horizontally or obliquely.
The drones used for these functions are often disassembled and easily resealable to be comfortable to transport, also waterproof to withstand the rain and with live video systems on the ground.

Before trying your hand at aero-photogrammetric surveys with a drone, you need to know that detection photographs are often not enough.

Our pilots know all the principles of topography and architectural surveys, so as to be aware if the type of survey obtained should be integrated with other tools.

Whether you choose our services or those of others, we recommend that you do not turn to improvised, excessively cheap and not a drone expert: even the most advanced technology today is in fact at hand, and inexperienced experts are now in order. of the day.

These shots are made by professional operators and have nothing to do with the classic wedding shooting with drone. Here in addition to being able to take high-level photographs, you also need to know the topography.

If you are not an expert but would like to try your hand at this technique and already have the basics of architectural surveys and topography, find out if in your city there are active courses for drone photogrammetry.

Point cloud

Production of the point cloud, i.e. a set of points characterized by their position in a coordinate system and by any intensity values ​​(colour, depth, etc.) associated with them. We usually need point clouds for the representation of three-dimensional structures as objects or surfaces in relief.

DSM / DTM

DSM (Digital Surface Model) ie the earth's surface including the objects above it (buildings, trees and other artifacts). DTM (Digital Terrain Model), represents the surface of the soil without anthropogenic and plant elements.

Orthophoto

Unlike a simple aerial photo, an orthophoto can be used to measure real distances, as it depicts an accurate representation of the Earth's surface. In fact, orthophoto projection is used to represent very complex architectural elements such as vaults, domes, baroque churches, etc. in two-dimensional elevations.

Mesh / 3D Model

Each point of a Cloud can be used as a vertex for creating a Polygon Mesh. It is a set of vertices, edges and faces that define the shape and size of the object. On this model, measurements of distances, areas and volumes can be made.

Level curves

The level curve is the curve that joins points with the same height, i.e. equal vertical distance from the reference plane to which zero height has been attributed. If they are above sea level they will be called contour lines. We use this technique in cartography to represent the three dimensions on a two-dimensional sheet, allowing us to get an idea of ​​the morphology of the territory.

Profiles and Sections

From each 3D model, it is possible to extract sections and elevation profiles as required. To obtain better graphic feedback, the sections are accompanied by the relative Point Clouds.

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