What exactly is geo-mapping and aerial survey?
We believe that the future of aerial surveying is not fixed and static, but flexible and dynamic. It´s a great way to receive data for orthophotos, 3D models in high resolution with great accuracy. We also offer you an in-house flight planning software, suited for simple dealing with data and parametres.
Aerial survey is a great solution for various kinds of applications. It can be use to deal with challenging sites such as quarries, sand pits, landfills, coal stockpiles. When using the drones in order to create aerial maps, you can undoubtedly go places that conventional equipment cannot reach. Moreover, you acquire more safety for your surveying staff and save time and costs.
Advantages of aerial mapping
Connection of a drone and a very precise GPS receiver is one of the crucial area of the future aerial mapping development. Another important feature is a special software, suited for data processing and virtual map making. This software allows to import the data gathered by the precise GPS receiver. Each image is connected to a required data package, which is important for further georeferencing and coordinate system making.
A common UAV survey can typically produce up to 500 high quality images per square kilometre, at 1cm to 5cm resolution. In addition, the detail obtained from the individual imagery or orthorectified mosaics usually surpasses anything else what is presently accessible even from satellite or classical aerial photography.
Aerial mapping step by step
The first step of UAV mapping is always preparation. There you should define your requirements and flight parametres, such as altitude, airspeed, overlap and distances. In a next step is done the actuall flight plan, including precise directions, amount, routes and such. As a next step is usually recommended to create control points for each hectar in order to achieve high accuracy geo-referencing. After that follow flight operations. Common recording while surface flight is performed at a 90° degree angle for capturing the images orientated straight down to the surface.
GPS coordinates are connected directly to the photo’s data, which allow to process the geo-referenced data in many GIS systems. After all that you can finally create 3D models and orthophotos. Conventional aerial photos are limited regarding their use in GIS because they are not true to scale. In order to create a scale correct photograph that can be accurately measured, an orthographic projection is definitely necessary, in which the view is straight down over every point in the photo. An orthographic photo can be really use to measure precise distances, for it is an accurate representation of the Earth´s surface.
Which software you can use for UAV mapping?
We suggest you to use a combination of two softwares as the most effective solution for UAV mapping. The first one is Agisoft PhotoScan, which is an ideal tool for 3D modelling, orthophotos, terrain modelling or generating od terrain models. As an extension for Agisoft PhotoScan we recommend you the second one, Virtual Surveyor software. Thanks to the terrain digital model, Virtual Surveyor will give you a chance to map as if you were in terrain for real, including making of contour profiles or determining of coordinate points.