Aerial 2D imagery and orthomosaic maps
At AutoSky North we fly our Inspire 2 and Phantom 4 UAV muti rotors to collect aerial images for a multitude of purposes. Mapping from heights of approximately 40 metres AGL with the DJI X5S camera allows us to produce ultra high resolution orthomosaic maps down to sub centimetre GSD. Our imaging capture can assist with site development planning and progress reports which can be overlaid on Google Earth to assist with presentation.
Using a combination of commercial and open source software we can provide 2D aerial capture of small to medium areas which can be provided in a number of formats including JPEG, TIFF, GeoTIFF and Google Earth KML. Furthermore we can provide 3D models of both man made buildings and terrain based mapping in most common formats.
Should you require a standard video flyover of your site we can either provide this in ultra high 4K resolution or full 360 degree static photography.
Our maps and image capture can be provided for inspections, progress reports or even time lapse photography. Should you wish to have survey grade imagery* to derive accurate measurements from then we can team up with your surveyor to assist in providing you with the appropriate maps.
Orthomosaic nadir map of Little Almscliffe Harrogate
Unfortunately we can only legally fly our UAV's up to a maximum altitude of 400 feet. Using an X5S camera with a standard 15mm lens in the nadir position would only allow us to capture an area of approximately 138 metres by 104 metres. This in turn would only give us a resolution of around 2.62 cms/pixel. In order to capture the area as depicted in this orthomosaic we would have to fly the drone much higher than legally permitted. This again would reduce our resolution down considerably.
The process of aerial mapping involves flying our UAV's over the target map area and taking consecutive overlapping images from low altitude. This allows us to capture the entire area while maintaining a sub centimetre GSD. Using specialised software the images are stitched together to produce one large map with extremely high resolution. Typically one of these maps could be around 40,000 pixels by 25,000 pixels and contain tremendous detail for later inspection. The maps are can be georeferrenced from coordinate information in the photographs or more accurately Ground Control Points to provide positional accuracy with regards to its location on Earth.
* There are known and inherited imaging and drone positional inaccuracies when relying solely on the information from within the drone's gps systems. Our aerial imaging alone cannot be used to derive and to record any accurate measurements from, especially for "survey-grade" commercial undertakings.