DJI Zenmuse L2 camera - FAQ
New camera DJI Zenmuse L2 introduces a host of innovations and improvements over the previous model. Check out answers to frequently asked questions regarding the new camera. Discover what has been changed compared to the previous version DJI Zenmuse L1 and what you should pay attention to.
DJI camera performance Zenmuse L2:
What is the level of protection of Zenmuse L2?
Zenmuse L2 has protection IP54 according to IEC60529 under controlled laboratory conditions.
To ensure the highest level of protection:
- make sure the interface and surface of the gimbal are dry before installation
- before use, make sure the gimbal is stably mounted on the drone and the SD card protection cap is clean and closed
- wipe the surface of the drone clean before opening the SD card protection cap
The level of protection decreases over time due to normal use and wear of the device.
With which drone the Zenmuse L2 is compatible? On which gimbal interface it can be mounted?
Zenmuse L2 is compatible with Matrice 350 RTK i Matrice 300 RTK and supports only DJI RC Plus as apparatus. Before use, update the drone and camera software to the latest version. To ensure mapping accuracy, make sure the L2 is mounted on a single gimbal connector facing down and the cable is connected to the right USB-C port (looking towards the drone).
What is the field of view (FOV) of the Zenmuse L2 LiDAR?
- repetitive scanning: horizontal 70°, vertical 3°
- single scanning: horizontal 70°, vertical 75°
What is the maximum detection range of Zenmuse L2?
Detection range:
- 250 m at 10% reflectance, 100 klx
- 450 m at 50% reflectance, 0 klx
The recommended height of operations is 30-150 m.
How many reflections does the Zenmuse L2 support?
Zenmuse L2 supports five types of reflections:
- single reflection (strongest echo)
- double bounce
- triple reflection
- quadruple reflection
- fivefold reflection
What is the processing speed of Zenmuse L2 mapping?
- single bounce: max. 240,000 pts/sec
- multiple reflections: max. 1,200,000 pts/sec
How many scanning modes does Zenmuse L2 have? In what situations do they apply?
Zenmuse L2 has two scanning modes: one-time scanning mode and repetitive scanning mode. In repetitive scanning mode, LiDAR can achieve more uniform and accurate scanning, meeting the requirements for precise mapping. In single-scan mode, it provides stronger penetration, gathering more structural information, making it suitable for power line inspection, forest surveys and other scenarios.
What is the accuracy of the Zenmuse L2 IMU?
- deviation accuracy: real-time: 0.2°, post-processing: 0.05°
- tilt/tilt accuracy: real-time 0.05°, post-processing 0.025°
- horizontal positioning accuracy: 1 cm + 1 ppm (RTK FIX)
- vertical positioning accuracy: 1.5 cm+1 ppm (RTK FIX)
The accuracy of yaw and pitch/tilt was measured under the following conditions in a DJI lab environment : Zenmuse L2 mounted on Matrice 350 RTK and turned on. Using the DJI Pilot 2 area route to plan a flight path (with IMU Calibration enabled). RTK in FIX status. The relative altitude was set at 150 m, the flight speed was set at 15 m/s, the gimbal pitch was set at -90°, and each straight section of the flight path was less than 1500 m.
What the RGB L2 camera is used for?
During mapping data collection, the RGB camera can provide real-time color information about the data, and the images taken can be used to reconstruct 2D RGB models. When mapping data collection is not needed, the RGB camera can take pictures and videos and collect images to reconstruct 2D or 3D RGB models.
What is the accuracy of Zenmuse L2 measurements and mapping?
- horizontal accuracy: 5 cm
- vertical accuracy: 4 cm
Measured under the following conditions in a DJI lab environment : Zenmuse L2 mounted on Matrice 350 RTK and turned on. Using the DJI Pilot 2 area route to plan a flight path (with IMU Calibration enabled). Using repetitive scanning with RTK in FIX state. The relative altitude was set at 150 m, the flight speed was set at 15 m/s, the gimbal pitch was set at -90°, and each straight section of the flight path was less than 1500 m. The field contained objects with distinct angular features and used control points of the exposed hard ground, which were consistent with the diffuse reflection model. DJI Terra was used for post-processing with the Optimize mapping accuracy option enabled. Under the same conditions, with the Optimize mapping accuracy option disabled, the vertical accuracy is 4 cm and the horizontal accuracy is 8 cm.
What CMOS size does the Zenmuse L2 RGB camera have?? What is the size in pixels?
The RGB camera uses a matrix CMOS 4/3, and the pixel size is 3.3 × 3.3 μm.
What improvements the Zenmuse L2 has over the previous generation?
LiDAR performance improved to about 1/5 of the L1 spot size when the object or area is within 100 m of LiDAR. LiDAR's penetration capability has been significantly increased, both detection range and accuracy have been improved. RGB camera pixel size increased by 89% compared to 2.4 × 2.4 μm in L1. IMU accuracy improved to 0.05° (real-time) and 0.025° (post-processing). LiDAR supports laser rangefinder (RNG).
DJI Zenmuse L2 field data collection
How efficient is Zenmuse L2's surveying and mapping?
The Zenmuse L2 can collect data from an area of up to 2.5 km².
Measured when the Zenmuse L2 is mounted on a Matrice 350 RTK at an airspeed of 15 m/s, flight altitude of 150 m, side overlap factor of 20%, IMU calibration enabled, altitude optimization disabled and terrain tracking disabled.
What are the application scenarios of Zenmuse L2?
Zenmuse L2 can be widely used in many scenarios, including topographic surveying and mapping, power line modeling, forest management, surveying and many other applications.
What type of SD card is supported for Zenmuse L2?
SD card with sequential write speed of 50 MB/s or higher and UHS-I Speed Grade 3 or higher; Maximum capacity: 256 GB.
What Zenmuse L2 real-time mapping modeling means? What coloring modes are supported?What operations are supported when browsing?
While collecting the original mapping data, Zenmuse L2 can generate and display a real-time model of the mapping in the DJI Pilot 2 application, processed with a small resolution. Four coloring modes are supported, including reflectance, height, distance and RGB. When viewing models in an album on a remote control camera, you can rotate, drag, zoom, quickly change perspective and re-center the view.
What types of aerial tasks are supported by Zenmuse L2?
L2 now handles the flight tasks of waypoint routing, area routing and linear routing.
Does the Zenmuse L2 require any steps before making a flight?
No action is required. Once the drone's RTK reaches FIX status, it can take off and operate.
Does Zenmuse L2 need to calibrate IMU during operation?
To ensure the accuracy of the collected data, enable the Calibrate IMU option. Turn on the Calibrate IMU option before performing a flight task. Before manual flight, you can click Calibrate before operation to manually start calibration. During the operation, manually restart the IMU calibration based on the countdown.
What is the purpose of the Zenmuse L2 job quality report?
Task quality report records the effective duration of LiDAR, camera and IMU data. Operators can assess the validity of data collection based on the status of each module.
What are the types of data stored on the Zenmuse L2 SD card?
- CLC (LiDAR camera calibration file)
- CLI (LiDAR IMU calibration file)
- LDR (LiDAR data)
- RTK (RTK data of the main antenna)
- RTL (RTK pole compensation data)
- RTS (RTK data of the auxiliary antenna)
- RTB (RTCM data of the base station)
- IMU (raw IMU data)
- SIG (PPK signature file)
- LDRT (file mapping for in-app playback)
- RPT (quality report mapping)
- RPOS (real-time POS solution data)
- JPG (photos taken during the flight)
Will there be a difference in accuracy when the Zenmuse L2 is mounted on a Matrice 300 RTK and Matrice 350 RTK?
In the FIX RTK state, there is no difference in accuracy between the two.
During operations, can operators replay mapping results?
Yes. Operators can view the current set of mappings on the display in real time, and quickly view the recorded 3D model mapping. Once the operation is complete, the 3D model can be downloaded and displayed in the library, and operations such as merging 3D models of points from multiple flights can be performed.
Operations such as model restoration and merging must be performed when the drone and Zenmuse L2 are connected.
Whether the live preview and real-time playback of the 3D mapping model are 1:1 compatible with the model rebuilt in post-processing?
This is not a 1:1 result. Both live preview and 3D point model playback are processed with diluted representation. In terms of the amount of mapping and accuracy is different from the model rebuilt in the DJI Terra.
Post-processing in the DJI Zenmuse L2
How to build an accurate model from data collected by Zenmuse L2?
Start DJI Terra to create a new task "LiDAR Point Cloud". Follow the instructions to import the data from the SD card into DJI Terra and complete the relevant settings, and you will be able to start precise modeling.
What result formats can be generated in DJI Terra with Zenmuse L2 data?
- formats mappings: PNTS, LAS, PLY, PCD, S3MB
- trajectory formats: sbet.out, sbet.txt
What new mapping processing features can Zenmuse L2 achieve with DJI Terra?
- Classification of ground points
- Output digital elevation model (DEM)
- A new accuracy check and check function that supports the local coordinate system to ensure that results achieve surveying and map accuracy
- Thickness optimization mapping between the flight lanes, making it thinner and more consistent
- More comprehensive report on mapping quality
How to understand the rebound value in DJI Terra?
The range of reflection coefficient is from 0 to 255, with 0 to 150 corresponding to a reflection coefficient from 0 to 100% with Lambert diffuse reflection, and 151 to 255 corresponding to a full reflection coefficient.
The value of the reflectance is related to many factors, such as the surface topography of the geographic object, lighting conditions and the angle of incidence, and may not strictly correspond to the absolute reflectance.
Summary
DJI Zenmuse L2, delivers a lot of performance u new advanced features. It offers a high level of protection, compatibility with Matrice 350 RTK and Matrice 300 RTK drones, and support for single and repeat scan modes. Key features include survey and mapping accuracy, the ability to collect data over an area of up to 2.5 km² in a single flight, and numerous enhancements compared to the previous generation, such as improved LiDAR performance and larger RGB camera pixel size. The post-processing of the data, available through DJI Terra, enables generation of various result formats, ground point classification, live viewing and playback of 3D mapping model. The new camera is sure to be appreciated in specialized flights and surveys.
