Q. My Model elevations are off? Why is there a difference between model elevations in the app as compared to the ones measured on the field?
Ans: Calculating elevations on the model is based on the following:
A. GPS data from drone that gets georeferenced to the images:
- Elevation(at which image was taken)
- Other camera parameters required for calculations
B. On uploading the images to the platform:
System will extract the attached data in the images and calculate elevation of the point of which the image was taken.
a. Use other parameters to calculate "Flight Height"
b. Elevation of the point = Elevation(at which image was taken) - Flight Height
As we observe, the flight height completely depends on the drone GPS. Hence if the drone GPS is not on point, the elevations on the model will be off too.
The user can use GCP rectification or follow best Flying practices available with Strayos to ensure such errors don't show up.
Q. Model edges are cut off or melted?
Ans: The images uploaded by the user are used to create a 3D model. For creating the 3D model, each feature in the images is blended and matched together to create one structure.
At times, there isn't enough data around the edges for all the features to be matched and blended together accurately resulting in melted structures or cut off edges. Hence, it is advisable to cover an extra margin of 20 ft around the edge of the data, the user wants to analyze.