Aerial mapping of land parcels in Dali

Drones can potentially help in creating high-quality aerial maps of large areas in a quick, cost-effective manner and by extend help expedite workflows in a variety of sectors including construction, parcel division, cadastre, agriculture, forestry etc.
Geoimaging ltd with an extensive experience and expertise in flying drones to create maps and 3D models offer UAV mapping solutions. Example of such a work is the areal mapping in Dali industrial area carried out by our company for division of two adjoining large land parcels. In land division tasks, a planimetric and altimetric survey plan of the parcels is essential. Due to the huge acreage, it was more reasonable in terms of time and cost saving to carry out the survey by using a drone, rather than the conventional surveying equipment. This method would provide high-accuracy results quickly since UAVs can fly in low altitude and therefore can capture high-quality imagery.
The first step of the procedure was to install targets on the ground in locations specified by our surveyors. These had to be large enough to be visible in aerial photos. 17 targets were installed in total. Then we surveyed these targets and provided their horizontal and vertical coordinates by using survey grade global positioning systems (GPS). The next step was to schedule the flight over the site-area to capture the imagery. Our experienced personnel flied the drone at a hight of 47m over the property, taking a series of photos with a large format aerial camera. During this process, multiple overlapping photos of the ground are captured from different angles as the aircraft flies autonomously along a flight path that we specify beforehand. 391 images were acquired in total.

Project Details

DATE

September, 2016

CLIENT

Private Users – Residents

PROJECT TYPE

Drone Mapping – Surveying

After acquiring the aerial images, the data were then processed properly in the office to create 3D models, large orthographic photomosaics, contour surfaces and elevation models (DTM, DSM). During this process, images are combined and aligned together based on the known ground target locations to produce an orthomosaic. The final georeferenced products of the project area give the ability to take accurate measurements of length, area and volume straight from the map. At the end of the whole procedure, the final products are manipulated properly in a CAD drafting software to add other descriptive information and design the proposed vision and roads.