Basics of Photogrammetry 2

What is the primary type of camera most UAS use?

Consumer cameras, which are not specially designed for UAS photography.

What sensor does the DJI Phantom 4 camera use?

1-inch CMOS (Complementary Metal Oxide Semiconductor) sensor.

What is the maximum resolution of Ultra HD (4K) video?

3840 x 2160 pixels (~8M pixels).

List two critical features of UAS cameras.

Good resolution and good image quality.

What overlap percentage is generally recommended for UAS imagery?

Higher overlap of ≥ 75% forward and side overlap.

What is a disadvantage of Multirotor UAS compared to Fixed Wing UAS?

Shorter range.

What is the purpose of Ground Control Points (GCP)?

To improve the accuracy of the model by providing reference points.

What is a 3D data product created from UAS imagery?

Orthophoto and Digital Surface Model (DSM).

What are the hardware requirements for using Pix4D with 14 MP images?

Windows 7, 8, 10 (64 bit), quad-core or hexa-core Intel i7/Xeon CPU, compatible GeForce GPU, and a minimum of 8 GB RAM.

What is the recommended number of GCPs for modeling?

5-10 GCPs, with a few extra for verification.