Land Survey Using Drones Is Becoming The Go To Choice For Topographical Surveys and Spatial Analysis Read Why Here!
Topographical survey or land survey and geospatial analysis are an essential part of any new development in the construction world and are often carried out utilising traditional methods with ground personnel and survey instrumentation such as at trimble, total station or digital theodolite measuring out grid referance points to create a map and determine any natural faults, elevation of the land, and the surrounding environment. Allowing for the architect to design and correctly position any new development
Topographic Surveys are used to identify and map the contours of the ground and existing features on the surface of the earth or slightly above or below the earth’s surface (i.e. trees, buildings, streets, walkways, manholes, utility poles, retaining walls, etc.). If the purpose of the survey is to serve as a base map for any new development.
So given the time that is required for general topographical land survey techniques, there is another option. Land survey utilising drone technology. The benefits are immediately obvious in terms of spatial analysis, orthomosaics, land mapping and photogrammetry techniques. They are ideally suited towards larger areas. For instance, a drone can carry out a land survey of 85 acres in approximately 2-3 hours collecting up 117 GPS points and 10 pre determined ground control points. A team of surveyors to allow for the same value data would be required to capture 1600 GPS points at one every 15 meters or so. This would take approximately 82 hours given ± 20 GPS points/hour
Land Survey / Topographic Survey Accuracy
The accuracy of the survey will be determined by the client, giving the land survey company the necessary information as to whether include ground control points (GCP) or not and is dependent on whether the client requires relative accuracy which is essentially local and referenced to the immediate surroundings or Absolute accuracy which is globally accurate ie if a point is chosen on the final map it should align with the coordinates of the global positioning system (GPS)
The same survey technique using drones can be also utilised to establish 3D images and point cloud analysis A point cloud is a set of data points in some coordinate system. In a three-dimensional coordinate system, these point cloud are usually defined by X, Y, and Z coordinates, and often are intended to represent the external surface of an object. Point cloud is ideally suited to analyze surface areas of man-made structure but have also been used to monitor natural areas such as cliff edges and coastal areas.
There are several methods of capturing point cloud data we have already briefly touched on the above photogrammetry option. Another method is to utilise a LiDAR method Light Detection and Ranging (LIDAR) is an airborne mapping technique, which uses a laser to measure the height of the terrain and surface objects on the ground such as trees and buildings, unlike photogrammetry techniques it is better suited to penetrate dense vegetation where maps are concerned. LiDAR is fast becoming the preferred method of point cloud data acquisition and mapping techniques
DJM Aerial Solutions have the equipment training and experience to offer this service to industry and would welcome any questions or enquires.
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