Geospatial surveying is used to create an accurate representation of a physical environment and this is done through the implementation of different technologies. When you obtain the services of a geospatial surveying service, they will use laser scanning, cameras and drones to give you a deep understanding of the site.
Drones have made geospatial mapping a lot easier as they are able to capture a large area in a small time. In addition to images, drones are able to capture other formats of data such as videos as well. And they are able to offer high-resolution aerial data. You can get a comprehensive area of the site with drones and the accuracy of the data collected will be at a high level as well. Before the drone takes flight, the controllers will plan the flight path depending on how much coverage is needed.
You can also decide which areas can overlap so that the data captured can be accurate. The images taken by a drone will overlap each other so that these can be stitched together at a later date to create a larger aerial image of the terrain in high resolution. Cameras are also used for mapping. The 3D and 2D images taken by the camera will help you extract accurate measurements. You can then process the overlapping images of the drones and the images from ground based cameras to come up with a 3D model of the terrain. You will need specialised software to achieve this.
With a coherent image is that it will first analyse common features in the images provided by the drones and the cameras. This allows it to calculate the positions of the features as well as how they are oriented in the space. This is called image mapping and you can create a point cloud in this way. Laser scanning is also used for mapping. This uses laser beams to accurately measure distances.
These sensors will emit a laser pulse and then measure how much time was taken for the pulse to bounce back. And doing this repeatedly will create a comprehensive point cloud. The laser scanner can also capture data from many angles because it is able to rotate and this will result in a dense set of 3D coordinates. And you can learn accurate information about the elevation and shape of the terrain in this way.
Once you have collected data from laser scanning in order to come up with a digital terrain model. The collected data will be merged and aligned in order to create an accurate representation of the site. The point cloud can be organised with the help of specialised software and this will help minimise any errors significantly. Data is taken from multiple sources for geospatial surveying and mapping and all this data is then integrated in order to produce a final representation of the site. Some additional data sources used for this are ground surveys, topographic maps and GPS data.