Photogrammetry
Photogrammetry is a branch of geodesy that uses images to obtain accurate data about objects and terrains by transforming 2D information from photographs into 3D (three-dimensional) information.
We use a mapping quadcopter drone (DJI Mavic 3E RTK) with the ability to fly up to 45 minutes in a single mission. This drone is equipped with a camera with 4/3” CMOS sensor and global shutter wide format and 1/2” CMOS (zoom 7X tele format). The camera allows video recording in 4K format (3840 x 1080p)@30fps and 20 megapixel photos (5280 x 3956 pixels).
The drone performs missions in a fully automatic mode, ensuring taking aerial photographs from predetermined heights, with both longitudinal and transverse coverage, according to the mission planning.
Images can be obtained with extremely detailed ground resolution, on the centimeter or even millimeter scale. Due to the integrated GNSS RTK receiver, the need to mark the control points at ground level is significantly reduced or, in certain circumstances, even completely eliminated.
What does the photogrammetry service include?
- The cloud of points generated by photogrammetry is the main result of the process and consists of three-dimensional points, being colored according to the aerial images used to capture the data.
- Orthophotoplane or photogrammetric mosaic
- 3D digital model of the surface - used for the calculation of filling and excavation volumes.
- 3D digital model of the terrain - the point cloud filtered by the elements that do not belong to the terrain is used: vegetation, buildings, power grid poles, structures and others. This model may be subsequently used for hydrotechnical studies, volume calculations, others.
- Site plan with the representation of the land slopes and the water drainage routes, highlighting the areas of water accumulation, respectively with water deficit
- Plans / thematic maps
- Photogrammetric processing
What is the orthophotoplane:
The orthophoto plane represents a mosaic of images taken by drone. This “composition” is not a simple distorted bonding, but a metric image, free from the distortions generated by the photogrammetric and relief camera, created in a well-established projection system (eg. the national projection system of Romania – Stereo ’70). Its resolution can be centimetric or even millimetric and the precision is calculated similarly to the point cloud example.
FAQ
How long do photogrammetric measurements take?
The flight can last from a few minutes for small areas to several hours for large areas. The duration of processing the obtained data varies depending on the area measured and the type of deliverables requested.
Can photogrammetry replace classical topographic surveying?
For large areas and open terrain, photogrammetry is faster than traditional methods. For areas with dense vegetation, details under trees or building interiors, it is recommended to combine it with traditional measurements or 3D laser scanning. Xplorate Group offers all three methods and recommends the optimal solution for each project.
How accurate are the measurements?
Wingtra Ray RTK is used for photogrammetric work where density and clarity of information are essential. Flight autonomy can reach up to 55 minutes, and in a single mission approximately 250 hectares can be photographed at a resolution of about 1.5 cm/pixel.
Aerial equipment includes drones such as the DJI Mavic 3E RTK, used for flights and detailed captures,
What is an orthophotomap and what is it used for?
The orthophotomap is a mosaic created from aerial or terrestrial images taken by a camera. It is a metric image free from distortions generated by the equipment or the photographed relief that can be used for analysis, measurement and decision-making.
It is used in design, urban planning documentation, surface calculation, monitoring the evolution of construction sites and as a basis for situation plans.
What deliverables do I receive from photogrammetric flights?
Depending on the project, we deliver orthophotos, 3D models, point clouds, digital terrain models (DTM, DSM), contour lines, site plans, volume calculations and other products tailored to the beneficiary’s requirements.
Do I need a flight permit?
Flight authorizations are the responsibility of Xplorate Group. The team holds all necessary approvals according to European (EU Regulation 2019/947) and national regulations regarding the operation of drones in Romania.
What information is needed for a quote?
The location of the land (address or coordinates), the estimated surface area, the purpose of the project (design, monitoring, volume calculation, urban planning documentation) and the desired deliverables. If you have existing documentation (cadastral plan, urban planning certificate), send it to us, it helps us with the estimate.
Proiecte verificări imbile
- Construction behavior tracking in time.
- Survey engineering, topographic surveys, pre-apartmenting and division into apartments.
- 3D laser scanning and 2D drawings, Scan- to-BIM
- Survey engineering, Topographic survey, Setting out of designed elements, Bathymetric survey, Monitoring, Settlements monitoring
- Division into apartments and cadastral documentation, survey engineering throughout the entire execution period, 3D monitoring, 3D scanning.
- Asistență topografică în șantier, UCC, rapoarte de monitorizare a deformatiilor 3D, măsurători As Built
- Survey engineering, topographic assistance on site, layout works, measurements and earthwork volume calculations (cut and fill).
- Photogrammetry, Survey engineering during the execution phase, Site plans for design purposes
- Survey engineering for the designed elements, land registration and division into apartments, topographical survey.
- 3D laser scanning , Virtual tour, 3D Solid model (Revit)
- Survey engineering, measurements for monitoring the behavior of neighboring constructions over time, earthwork volume calculation, 3D monitoring of capping beams
