Aerophotogrammetry services with UAVs allow to perform high resolution topographic surveys of large extensions (GSD <5cm / pixel) in a short period of time. This technique did not come to replace the traditional methodology, but to add to the method in situations like extensive areas coverage, or when the client needs more information than a planialtimetric plan. To achieve the precision and accuracy desired in the final products, it is necessary to acquire coordinates of ground control points with precision GNSS equipment.
From the generation of Orthophoto Mosaics, Digital Surface Models, Digital Terrain Models and 3D Point Clouds, Level Curves can be obtained in centimetric intervals, Declivity Maps (in percentage or degrees), Land-Use and Occupancy Maps and Volumetric Calculations. These products serve as a basis for decision making in several sectors, such as: Zoning, Land-Use and Occupancy Projects for Urban and Rural Cadastre; Cut and Fill Calculations for Civil Construction; Stockpile Volumetric Calculations for mining; Agricultural Crop Planning; Definition of corridors for transmission line installation; Permanent Conservation Areas Delimitation and others.
The use of sensors embedded in UAVs is a fundamental resource in the aid of inspection processes of structures and installations, and in the monitoring of engineering works, whether for continuous monitoring, security plans or preventive and corrective maintenance. Sensor type adaptation (RGB or Thermal camera) to the objective of the inspection provides a more detailed analysis of the inspected object, besides adding quality to the work and optimizing the execution time.
Obtaining images and videos in very high resolution (in the spectrum of the visible or infrared) favors the detection of problems like; thermal anomalies, structural pathologies, breaches, cracks, oxidation, corrosion, deterioration, rupture of parts and fittings, leaks, infiltrations, among others.
Some advantages of drone inspection are: increased productivity, reduced risk and human error, reduction and optimization of costs, flexibility and versatility in hard-to-reach targets, and millimetric scale of targets. Wind generators, solar panels, metallic structures, towers, transmission networks and electrical substations are some examples of inspections offered by Geo Vant.
Planning for mining activities becomes more and more precise and efficient with the use of Aerophotogrametry techniques, providing greater assertiveness in the search for mining fields, besides accurate volumetric calculations with complete safety and without the necessity to stop the activities. The information acquired from the aerial survey helps in the various stages of the mining process, from ore location research, through the exploration, volumetric calculations of ore beds, to the environmental recovery and mine closure.
The UAV-based optical sensors (RGB, Thermal and Multispectral cameras) represent a versatile technology that enables integrated management of all stages of agricultural cultivation, providing essential results for the farmer and adding value to the final product. Continuous monitoring of the crop enables the generation of a database to analyze the evolution of production in time, which optimizes the different stages of the production process and increases the quality of land-use management.
Through the use of Thermal and Multispectral cameras it is possible to detect the water and nutritional stress of the cultivated area, apart from providing analysis of vegetation indices, such as NDVI (Normalized Difference Vegetation Index). Among the main utilities of the products generated by RGB sensors are: level curves, declivity and zoning maps, land-use and occupancy for crop planning; establishment of spacing, lines and density of crops; detection of cultivation failures, pests and diseases; temporal analysis of cultivation and periodic monitoring.
Aerophotogrammetric imaging carried out through the UAVs allows high resolution spatial data generation in a short period of time, fundamental characteristics for works in the Environmental area, whether for an environmental diagnosis or for periodic monitoring. Sensor type adaptation (RGB, Thermal and Multispectral cameras) to the work specifications, allows the acquisition of a range of information necessary for the elaboration of technical reports, analyses, studies and environmental programs, such as: Environmental Impact Studies and Respective Environmental Impact Report (EIS-REIR); Degraded Area Recovery Programs (DARP); Preliminary Environmental Report - PER; Simplified Environmental Studies - SES, among others.