Answering Your Questions on the DJI Zenmuse P1 | COPTRZ

Answering Your Questions on the DJI Zenmuse P1

Tom Best

6:15 pm GMT •

July 11, 2022

The DJI Zenmuse P1 is DJI’s first entry into the photogrammetry market. Integrating a full-frame sensor with interchangeable fixed-focus lenses on a 3-axis gimbal, this payload takes efficiency and accuracy to a whole new level.

But just how good is this payload?

In this blog, we’ll be answering your questions on the DJI Zenmuse P1.

How efficient is the DJI Zenmuse P1?

For the first time, DJI used a full-frame sensor with a 4.4μm pixel size to give you even higher image quality. With a 45MP sensor and fast shooting intervals, the P1 captures high-resolution images of large areas in short flights, providing you with high-quality meshes that you can share with your clients.

In just four flights totalling 140 minutes, you can expect to collect data for up to 10 kilometres squared of 2D orthomosaics with centimetre level accuracy.

Want to find out how it stacks up against other survey drones? Click here to download our accuracy report!

What quality of images can I get with the DJI Zenmuse P1

The P1 supports various formats, including JPEG, DNG, JPEG+DNG for images or MP4 and MOV for video. This provides you with maximum flexibility for your missions, giving you the opportunity to maximise quality or conserve storage space.

Dataset from DJI Zenmuse P1

Credit: DJI

With a continuous shooting interval of 0.7 seconds, and a mechanical shutter speed range of 1/2000s – 1s, the P1 provides crisp images without any damage or warping. This means that while the drone travels at a fast velocity, you can still expect the accuracy of data retrieved to meet the requirement of one to five hundred cadastral surveys.

DJI has also included a low-noise and high-sensitivity mode of the P1 that can improve camera sensitivity (ISO) while reducing noise levels, expanding the range of operable scenarios for the P1.

Which lenses does the DJI Zenmuse P1 support?

DJI have created three lenses to accompany the P1, including 24mm, 35mm and 50mm focal lengths that are connected via DL mount. This provides flexibility for missions, giving you the ultimate choice of how far or close to fly to the site. Each lens works within the operational tilt range of the P1, which is -45° to -90°.

The ground sampling distances of each lens are follows:

24mm lens: GSD=H/55;
35mm lens: GSD=H/80;
50mm lens: GSD=H/114;
Ground Sampling Distance GSD is measured in centimetres (cm)/pixel; target distance H is measured in meters (m).

What operating modes does the Zenmuse P1 support when used with the Matrice 300 RTK?

The P1 supports the following operating modes: aerial photography (including Smart Oblique Capture), oblique photography, corridor mapping flight, waypoint flight, and manual operation.

How does Smart Oblique photography work?

One of the most proven techniques for 3D modelling is oblique photography. This is where several lenses are mounted together in an array with fixed axis angles, which allows the camera the ability to capture images that may have been missed by traditional vertical photographs.

DJI Matrice 300 completing datascan | DJI Zenmuse P1

The systems use a mechanical rig with five cameras set in positions in a cross configuration; one camera in the centre is surrounded by four other cameras, in front, behind, left, and right, equally distanced at 90-degree intervals. This arrangement places the central camera at an oblique angle where the ‘nadir angle’ (an angle measurement used by aircraft which uses the downward vertical as zero) is a known, fixed point in the images collected.

With the Zenmuse P1, DJI has released a feature called ‘Smart oblique photography’, whereby photo ortho and oblique photos necessary for 3D reconstruction are acquired through one flight path. Only photographs that are essential to reconstruction are taken at the edge of the area of flight, reducing the images collected and drastically improving the efficiency of post-flight processing.

With each flight area requiring a unique capture strategy, photos taken on each flight path are based on the target data collection zones set by the user. The aircraft will then fly in the most efficient mode, with flight speed being adjusted based on the different oblique capture sequences in each sector.

On occasions, only four, three or maybe one angles will be captured by the Zenmuse P1 when flying in Smart Oblique Capture mode. Generally, this will happen at the edge of a flight area and happens because the P1 is designed to capture images that are required for the 3D model. The shooting sequence executed depends on the size of the measurement area demarcated by the user, the flight altitude, and the camera’s tilt angle.

Want to find out more on Oblique Mapping? Click here to find out how to use it within DJI Pilot on your Matrice 300 RTK

What surveying and mapping scenarios can the Zenmuse P1 be used?

The P1 is an incredibly flexible solution, offering services for 2D orthomosaic, 3D obliques, live-mapping and detailing modelling.

Application scenarios include:

  • Topographic Mapping – A detailed record of a land area, giving geographic positions and elevations for both natural and man-made features.
  • Cadastral Surveying – A specialised survey for the establishment and re-establishment of real property boundaries
  • Architecture, engineering, construction, and Surveying
  • Natural Resource Management – The management and classification of natural resources, such as land, water, vegetation etc.
  • Geological Investigation – Understanding the structure and layout of the land
  • Disaster Site Modelling – Obtaining real-time overviews of disaster-struck areas that can be relayed to teams on the ground to better enhance decision making.

Does the DJI Matrice 300 RTK support PPK post-processing when used with the Zenmuse P1?

It does. The task folder on the stores photos, original global navigation satellite system (GNSS) observations, and TimeStamps.MRK files, which. Are used for PPK post-processing calculations.

Post Processed Kinematic (PPK) is a GPS correction technology technique that corrects location data after it is collected and uploaded. The data can be uploaded to the cloud for processing or processed using specialised software on your desktop after the flight has been concluded.

Alternatively, you could also use RTK (Real-Time Kinematic) sim-card to provide real-time corrections to location data as the drone is surveying and capturing images from a site.

Not sure if you need a PPK station? Find out what is better for you with our PPK vs RTK blog!

Find out more information

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