DroneSurvey.pdf
- 1. Drone Survey Air Survey Section SGO Air Survey
- 2. Introduction to Drone A drone survey refers to the use of a drone, or unmanned aerial vehicle (UAV), to capture aerial data with downward-facing sensors, such as RGB or multispectral cameras, and LIDAR payloads
- 3. Drone Mission Process at MLMR Drone Survey Request/Approval (DGIM) Flight Plan and Logistics NOTAM Application CAAF Surveyor places GCP/CP pegs Drone Flight Processing the Images Pix4D Capture Using ArcGIS Structure, Transport, etc Produce Reports Deliver Product
- 4. Air Survey Coordinate System Flight Coordinate System Coordinate data recorded in Image Default horizontal system usually WGS84 Lat and Long (in degrees) Default Vertical usually EGM96 MSL reference ellipsoid (in meters) Ground Coordinate System Coordinate System which Ground Control Points are usually defined Usually different from Image reference system Fiji Map Grid Output Coordinate System If you are using Control Points it will project to the same The default will be WGS 84
- 5. Impacts of an incorrect Specification Products could be misaligned wrt Base Map (Horizontal Reference Error) Computed Surfaces above or below terrain. Products could be invisible due to being obscured by terrain layer (vertical Reference Error)
- 7. Global Gravity Potato (“Geiod”) Used to define vertical coordinate Equipotencial Models with names like EGM96 EGM 2008 GEIOD12 Reason for separate Horizontal and vertical systems Horizontal Position is defined wrt ellipsoid Vertical Position is defined wrt ellipsoid or geiod MSL Elevation is define as perpendicular from geiod not ellipsoid Geoid and ellipsoid high can differ by >30m
- 9. GCP & CP
- 10. Control Points and Check Points
- 11. Transformation: WGS84 to FMG
- 12. Point Cloud:
- 15. Orthomosaic:
- 16. Structure: Plotted using ArcGIS (But captured from the Ortho Photo)
- 17. Roads: Plotted using ArcGIS (But captured from the Ortho Photo)
- 18. Electric Poles Plotted using ArcGIS (But captured from the Ortho Photo)
- 19. Drains: Plotted using ArcGIS (But captured from the Ortho Photo)
- 20. Contour Lines: Generated From Pix4D using Digital Surface Model and the Digital Terrain Model. 0.5 meters 1 meters 2 meters 5 meters 10 meters
- 21. Spot Heights Using ArcGIS we got the spot heights from the Digital Surface Model
- 24. Reports and Data Reports With Drone processing software we can easily obtain a processing report Report will state orientations, projections, accuracy, etc. 2021_10_Naboro_report.pdf 2021_10_Waidamudamu(DLOCE)_ report.pdf Data Types CAD DWG DWG Shape GeoTiff, JPEG, PNG 3D Tiff Etc
- 25. Quality Control
- 26. End Product
- 28. Summary Drones provide a more complete picture of the work being done. With a drone, topographic surveys can be developed of the same quality using traditional methods. Decreased Field Time and Costs Larger sites can take days and sometimes weeks for land surveyors to compile information using traditional methods. Collecting this same data via a drone technology saves time. Capturing topographic data with a drone is up to five times faster than with land-based methods. Less Disruptions Since drones are capturing data from above, operations on site won’t be interrupted. Using a drone also requires less manpower. There’s no need to place multiple specialists at a site when you have a drone to survey the land. You do not need to close down highways or train tracks. You can capture data during a project operation using a drone without disruptions
- 29. More Accurate Data and Precise Measurements Drone cameras take a series of high-definition photos at different angles, creating thousands of accurate data points, including geo-references, elevation points, and colors. This allows developers to create 3D models of a site or building. Clients can see more than what a traditional survey provides. The maps created from using data from a drone can be used to extract highly accurate distances and volumetric measurements. When a drone is integrated with surveying land, the data looks more realistic. The videos and photos taken from the drone are a great resource for clients and the public when a new commercial project is in the works. Maps Inaccessible Areas Land surveying can be a dangerous job. Drone surveys eliminate the need for surveyors to traverse unknown terrain. This helps avoid high-risk situations navigating areas such as rail lines or rocky terrains. Drones are especially useful in gathering data in hard to reach locations or vantage points that are inaccessible. A drone can fly almost anywhere and can take on steep slopes and harsh areas unsuitable for traditional measuring tools.