COLOUR DIGITAL AERIAL SURVEYS FOR THE PRODUCTION OF CARTOGRAPHY , LIDAR SURVEY, MULTISPECTRAL SURVEYS
Avioriprese is capable of providing a series of surveys, with digital cameras and/or airborne sensors for the acquisition of georeferenced photogrammetrical images, multi LiDAR and hyperspectral (both visible and in infrared and thermal), for the purposes of the characterisation of the territory and the environment in all its metric and qualitative aspects. Thanks to the synergy with the other companies of the group, it has all the technological infrastructure necessary to conduct in-house the entire production cycle from the air fleet, with a hangar and a certified maintenance workshop, to digital cameras for photogrammetrical surveys; to special sensors, such as apparatuses laser scanner (LiDAR) and multispectral, hyperspectral and heat sensors.
– Photogrammetry is the technique that allows the detection of metric information (size and shape) of three-dimensional objects from photographic images.
– The information in an aerial photograph can be analysed and “extracted” to be transposed onto paper with different modes and aimed at different purposes.
– For the production maps using photographs taken by chambers mounted on airplanes (aerial photogrammetry).
– Another product resulting from aero-photo-grammetric activities is orthophoto maps. An orthophoto is an aerial photograph that has been geometrically corrected (i.e., has undergone a process of ortho-rectification) and georeferenced in such a way that the representation scale of photography is uniform, i.e. the photo can be considered equivalent to a map.
FIELDS OF APPLICATION
– Regional and urban planning
– Management of the territory
– Design of infrastructural works
– Engineering works
– Civil Protection
– Technique numerical mapping at all scales
– Data Base topo-mapping
– Thematic mapping from photo
– Cadastral map
– Digital terrain models (DTM), Surface (DSM) and built (DBM)
– Digital Orthophoto
– Survey of quarries, landslides, heaps, etc.
– Survey of major structures and infrastructure
LiDAR (Light Detection and Ranging) is a technique for detecting aircraft that allows you to determine the spatial coordinates and the sharing of the points on the ground on the basis of the return time of a laser pulse, by providing a link of topographical data of high density and high precision in a very short time, even on large areas, enabling the identification, characterisation and mapping of morphologies present, both natural and anthropogenic. The processing of the link of coordinates provided by LiDAR allows the formation of digital terrain models (DTM), surface (DSM), Elevation (DEM), the Built (DBM). You can also use the qualitative and quantitative assessment of the evolution of quarries, landfills, as well as the detection of aerial lines of energy transmission.
The LiDAR technology presents some important features and specifications:
– High quality metric of the survey;
– A very high density of sampling and productivity, with the acquisition of “clouds” of millions of 3D points in a very short time;
– Information about the radiometric response of the signal;
– Possibility to “perforate” vegetation, and then the ability to determine the morphology of the natural terrain, even if partially covered;
– Relative independence from weather conditions and the brightness of the environment.
FIELDS OF APPLICATION
Applications of LiDAR technique are numerous:
– Support for the design and accounting for large civil engineering works and infrastructure (roads, railways, industrial plants, etc.);
– Environmental and geological study, with formation of numerical models of three-dimensional slopes, riverbeds and mountain basins;
– Study of the consistency and of the evolution of landslide phenomena and upheavals;
– Survey of large open sky quarries and the count of sample volumes;
– Survey of A. T. electric lines and sub-electric stations;
– Survey with 3D modelling of population centres, with estimation of the volume of the built up areas;
– Surveys for civil protection in critical areas for prevention and mitigation of risk (floods, landslides, mudslides, etc.) and the study of evacuation plans;
– Estimate of forest biomass;
– A multispectral survey is a technique that combines both spectroscopy as well as classical photogrammetry.
– This technology, which allows you to detect spatial and spectral information of an object, consists in the simultaneous acquisition of images in spectral contiguous bands.
– The value of every single pixel of the image remotely sensed represents the spectrum of response in the band of the material struck.
The environmental monitoring by aerial surveys with hyperspectral sensors allows you to obtain valuable feedback able to overcome the known limits of the applications in the visible range. By choosing particular parameters and algorithms, one can detect for example:
– Vegetation Index NDVI
– Sediment in suspension
– Chlorophyll concentration
FIELDS OF APPLICATION
– Detecting pollutants
– Mapping the covers of asbestos
– Agricultural Stress
– Areas covered by fire
– Fire risk areas
– Precision Farming (diagnostic and production of agricultural indicators, maps of land cover and inventory of crops)
– Environmental, geological, and marine monitoring
– Inventory and monitoring of the biomass in the forest areas
– Support in the fields of archaeology
– Monitoring and control of the carbon cycle, by identifying the critical resource in soil.
– Mapping of urban and functional areas
– Safety (to support intelligence operations)
– Atmospheric Characterisation