DJI PHANTOM 4PRO PPK FOR QUARRY SURVEY AND VOLUME CALCULATING

Рис.1. Маршруты площадной аэрофотосъемки

The whole process of aerial photography took about 15 minutes.

Preliminary processing was carried out on the-site using a field notebook. We carried out Post-processing of GNSS measurements and photogrammetric processing with using the coordinates of the centers of images determined with a centimeter accuracy by the on-board GNSS receiver (Pic. 3). As a result points cloud (Pic. 4, 5,6) orthomosaic (Pic. 9 ). and DTM were created (Pic.8)

Рис.2. Центры фотографирования определенные с сантиметровой точностью бортовым GNSS приемником

Рис.3. Плотное облако точек

Рис.4. Плотное облако точек

Рис.5. Плотное облако точек

To assess the quality of data we used ground control points provided by the customer. The errors in plan and height were up to 8 cm and 15 cm, respectively. After focal distance calibrating with using at least one of the reference points, the accuracy in height was improved up to 8 cm.

Finally digital terrain model was created by automatic classification of the points cloud (Pic 7,8)

It should be noted that the resulting 3D model with 5 cm resolution corresponds to LIDAR data, and it is possible to classify vegetation, buildings, structures and other technological objects and create a detailed and accurate 3D terrain model.

The results of this projects fully meet the requirements of the customer and showed, on a practical example, the following advantages of unmanned aerial survey technology before using traditional methods:

— high accuracy and details

— high efficiency and productivity

— high percentage of automation of the processing

— low cost

— short terms of project implementation

Рис. 6. Цифровая модель местности до классификации облака точек

Рис.7. Цифровая модель рельефа, растительность и технологические объекты исключены

Рис. 8. Ортофотоплан совмещенный с горизонталями