Drone mapping has now come into its own. We can measure sites in a fraction of the time of conventional survey operations. That isn’t to say this technique is without limitations. As skilled land surveyors, we know the relative accuracies of data. We understand the limitations of drone technology. As a result, we can maintain precision across a project. While any drone pilot can make a map only a trained land surveyor has the depth of knowledge to deliver precise spatial data. We can map sites quicker than a conventional land survey takes and with better deliverables. As land surveyors, we know quality still counts when carrying out land surveys with drones. We apply this know-how throughout our drone services.
For the ultimate service we take an integrated approach to data gathering and can provide visually rich and accurate deliverables as 3d models.
Aerial based Land Surveys offer the best data coverage, accuracy, with highly visual deliverables using Airborne Photogrammetry and Lidar/Laser Scanning.
Photogrammetry
Drones have brought about a renaissance in Photogrammetry. The origins of Photogrammetry stretch back over 100 years. Photogrammetry, until recently, has been limited to large scale airborne flights using aeroplanes and helicopters. Yet, Advances in drone technology and the photogrammetry software behind them have revolutionised survey work. Over lapping photographs are used to calculate 3d points in a sparse point cloud, then dense point cloud before a 3d mesh model is created. The final step is to apply textures to the model.
Lidar Mapping
Lidar surveys have their own limitations but also some unique advantages. Lidar makes many return measurements at various levels. Effectively ‘peaking’ through the gaps in vegetation to measure the ground details below the canopy. This allows us to remove vegetation, revealing hidden ground details. We can then extract survey data in hard to reach areas with relative ease. Where required we can infill with traditional topographical survey equipment (total station, GPS etc.) to produce a drone topographical survey.
Drone mapping
We are able to produce drone mapping surveys & models of ground survey-grade quality. We have a sound appreciation of data quality. Our skills as Land Surveyors, acquired with over 30 years working in the trade, allows us to match the survey method to a client’s needs and specifications. For some projects, we can use the full range of methods and apply them to a project. We can combine photogrammetry data, Lidar data and ground survey data as required to produce a quality drone land survey or integrate the survey with a measured building survey for complete coverage of your project.
The most basic deliverable is a rectified and geo-referenced orthographic photograph of a project area. For construction monitoring / progression monitoring this may be sufficient on its own. However, a drone land survey will take the 3d data created and convert that into a survey-grade topographical survey.