Things to Know Before Using Drone Photogrammetry Services
Things to Know Before Using Drone Photogrammetry Services
Drone photogrammetry services are used to capture multiple 2D images over a specific geographic area. These images are uploaded on a platform to create accurate 2D and 3D orthomosaic maps using a photogrammetry processor. Primarily, these services are preferred in construction projects, starting from the initial design process to post-construction finalization.
How Drone Orthomosaic Photogrammetry Functions
There are two stages of drone imagery services, image capture and image processing. Drones fly at the right altitude and catch every angle, capturing multiple images. The multiple views of the terrain are combined to create an updated 2D and 3D model of the area. The operator must ensure there is enough image overlap because multiple images are stitched together and any areas that are missed cause distortion in the final deliverable.
Are Drone Imagery Services Accurate?
As drones can fly in and above unsuitable and inaccessible areas, they assure accuracy in creating 2D and 3D models with photogrammetry data. The images captured are more accurate than taking manual photos.
Certain factors that impact the accuracy of drone services are a poor photo overlap ratio, incorrect altitude, weather, or poor GPS signal strength. It’s important that you plan your mission for accuracy.
How Can You Improve Accuracy in Drone Photogrammetry?
Utilize ground control points or GCPs– One of the most important elements in a survey is Ground Control Points, which are physical markers on the ground. They are painted on the ground at fixed coordinates or distinct patterns, improving the accuracy of photogrammetry. Don’t forget to save the geo-location of images.
Adjust camera settings– The images captured should be consistent with quality throughout the flight. To make it possible, adjust the settings of the camera manually, ensuring they are standardized.
Capture lots of images– If you have more images, the results will be better. In drone photogrammetry services, overlapping images are a must. This supports more accurate stitching of images together. So, it’s advised to reschedule the service if there is poor weather.
How is Photogrammetry Different from LiDAR?
Like drone photogrammetry, LiDAR is a powerful solution for aerial mapping and surveying. In LiDAR systems, there are laser pulses emitted from a sensor. The time taken by the laser to return after hitting an object is used for distance calculation.
Both methods are effective; that’s why people are confused about what service to use. To make an informed decision, you should know a few differences between them.
Photogrammetry is more cost-effective than LiDAR as the equipment cost of the latter service is more than the former. Also, LiDAR provides elevation information and lacks color data, which is very important in certain applications.
Get Drone Photogrammetry Services from C-N-I Locates
Drone photogrammetry is not easy. To ensure accuracy, it requires knowledge and expertise, which you might not possess. So, we suggest getting help from a professional drone service provider.
If you are in Oregon or Washington, contact C-N-I Locates for drone photogrammetry services.
