JHD DJI Zenmuse L2 Liar Worry-free Basic Ultimate Edition Package

Name: JHD DJI Zenmuse L2 Liar Worry-free Basic Ultimate Edition Package -
SKU: DJI L2 Liar Camera
Availability: InStock

Versions	L2 Worry-free Basic Edition Package, L2 Worry-Free Ultimate Edition Package

Specifications

Technical Parameters

Overall parameters

product name
Zenmuse L2

size
155 mm long, 128 mm wide, 176 mm high

weight
905±5 grams

System power consumption
28 Watts (Typical)
58 Watts (Maximum)

Protection level
IP54

Supported models
Matrice 300 RTK (needs to be used with DJI RC Plus)
Matrice 350 RTK

storage temperature
-20℃ to 60℃

System performance

Measuring range
450 meters (reflectivity 50%, 0 klx)
250 meters (reflectivity 10%, 100 klx) The^{above data are typical values. Test conditions: Planar target, target size is larger than laser beam diameter, atmospheric visibility is 23 kilometers, laser is vertically incident.}^{Supplementary explanation: The measuring range under sunny conditions is shorter than that under cloudy conditions; if a laser beam hits more than one target, the laser pulse energy is dispersed and the measurable distance may be shortened; the measuring distance is cut off at 500 meters.}

point cloud data rate
Single echo: Maximum 240000 points/second
Multi-echo: Maximum 1200000 points/second

System accuracy
Plane accuracy: 5 cm @ 150
meters^{Height accuracy: 4 cm @ 150 meters Measured at DJI outdoor experimental site and under the following conditions: Zenmuse L2 is mounted on Matrice 350 RTK and powered on, using DJI Pilot 2’s planar route planning Route (turn on inertial navigation calibration), use repeated scan mode, RTK status is FIX, relative flight altitude is 150 meters, flight speed is 15 meters/second, gimbal pitch is -90°, each straight line segment in the route does not exceed 1500 meters, the ground objects have obvious angular features, and exposed hard checkpoints that conform to the diffuse reflection model are used. Use DJI Maps for post-processing, and turn on point cloud accuracy optimization during processing. Under the same conditions, if point cloud accuracy optimization is not turned on, the elevation accuracy is 4 cm and the plane accuracy is 8 cm.}

Real-time point cloud coloring mode
Reflectivity, height, distance, true color

lidar

Ranging accuracy (RMS 1σ)
2 cm @ 150 meters

^{measured at an ambient temperature of 25°C, a target object reflectivity of 80%, and a distance of 150 meters. The specific values are related to the test conditions and are for reference only. Please refer to the actual measurement results.}

Maximum number of echoes supported
5

Scan mode
non-repeating scan, repeating scan

FOV
Repeating scan: horizontal 70°, vertical 3°
Non-repeating scan: horizontal 70°, vertical 75°

Minimum measuring distance
3 meters

Laser divergence angle
Horizontal 0.2 mrad, vertical 0.6 mrad

^{are measured under half-width conditions. 0.6 mrad means that the diameter of the laser beam increases by 6 cm for every 100 meters of distance.}

Laser wavelength
905 nm

Laser spot size
4 cm horizontally, 12 cm vertically @100 meters (FWHM)

Laser pulse emission frequency
240kHz

Laser safety level
Class 1 (IEC 60825-1:2014)

Accessible emission limit (AEL)
233.59nJ

Reference caliber
Effective diameter 23.85 mm (equivalent to circular)

Maximum emission power of laser pulse within 5 nanoseconds
46.718 watts

inertial navigation system

IMU update frequency
200 Hz

Accelerometer range
±6g

Angular velocity measurement range
±300dps

Heading accuracy (RMS 1σ)
Real-time: 0.2°, post-processing: 0.05°

^{Measured at DJI outdoor experimental site and under the following conditions: Zenmuse L2 is mounted on Matrice 350 RTK and turned on, using DJI Pilot 2’s planar route to plan the route (turn on inertial navigation calibration ), the RTK status is FIX, the relative flight altitude is 150 meters, the flight speed is 15 meters/second, the gimbal pitch is -90°, and each straight line segment in the route does not exceed 1500 meters.}

Pitch/roll accuracy (RMS 1σ)
Real-time: 0.05°, post-processing: 0.025°

^{Measured at DJI outdoor experimental site and under the following conditions: Zenmuse L2 is mounted on Matrice 350 RTK and turned on, using DJI Pilot 2’s planar route to plan the route (turn on inertial navigation calibration ), the RTK status is FIX, the relative flight altitude is 150 meters, the flight speed is 15 meters/second, the gimbal pitch is -90°, and each straight line segment in the route does not exceed 1500 meters.}

Horizontal positioning accuracy
RTK FIX: 1 cm + 1 ppm

Vertical positioning accuracy
RTK FIX: 1.5 cm + 1 ppm

mapping camera

sensor
4/3 CMOS, effective pixels 20 million

lens
FOV: 84°
Equivalent focal length: 24 mm
Aperture: f/2.8 to f/11
Focus point: 1 meter to infinity (with autofocus)

Shutter speed
Mechanical shutter: 2 to 1/2000 seconds
Electronic shutter: 2 to 1/8000 seconds

shutter life
200,000 times

photo size
5280 × 3956 (4:3)

Photo shooting modes and parameters
Single shot: 20 million pixels
Timed shooting: 20 million pixels
JPEG Timed shooting interval: 0.7/1/2/3/5/7/10/15/20/30/60 seconds
RAW/JPEG + RAW Timed shooting interval: 2/ 3/5/7/10/15/20/30/60 seconds

Video encoding and resolution
H.264
4K: 3840 × 2160@30fps
FHD: 1920 × 1080@30fps

ISO
Video: 100 to 6400
Photos: 100 to 6400

Video bitrate
4K: 85Mbps
FHD: 30Mbps

Support file system
exFAT

Image Format
JPEG/DNG (RAW)

video format
MP4 (MPEG-4 AVC/H.264)

PTZ parameters

stable system
3 axes (pitch, roll, yaw)

Angle jitter
0.01°

Installation method
DJI SKYPORT quick release

Mechanical angle range
Pitch: -143° to +43°
Pan: ±105°^{* The above data are structural limits, not controlled soft limits.}

Controllable rotation range
Pitch: -120° to +30°
Pan: ±90°

Operating mode
follow/free/return to center

data storage

Raw data storage
Photo/IMU/point cloud data storage/GNSS data/calibration file

Point cloud data storage
Real-time modeling data storage

Supported memory card types
microSD card; supports a maximum capacity of 256GB, a sequential writing speed of ≥50MB/s, and a transmission speed of UHS-I Speed Grade 3. Please use the designated recommended memory card.

Recommended memory card types
Lexar 1066x 64GB U3 A2 V30 microSDXC
Lexar 1066x 128GB U3 A2 V30 microSDXC
Kingston Canvas Go! Plus 128GB U3 A2 V30 microSDXC
Lexar 1066x 256GB U3 A2 V30 microSDXC

Post-processing

Support software
DJI Maps

Data Format
DJI Terra supports exporting point cloud models in the following standard formats:
PNTS/LAS/PLY/PCD/S3MB.

FAQ:

System performance

What is the protection level of Zenmuse L2?

Under controlled laboratory conditions, Zenmuse L2 can achieve IP54 protection level under IEC60529 standard. When using, please pay attention to the following:
Please confirm that the gimbal interface and the surface of the gimbal are dry and free of water before proceeding with the installation operation; please
confirm that the gimbal is firmly installed on the aircraft, and the SD card protective cover is clean and free of foreign matter and has been closed;
Before opening the SD card protective cover, you need to wipe the surface of the phone clean.^{The protection level is not permanently valid, and the protection capability may decrease due to long-term use and equipment wear.}

What flight platform is the Zenmuse L2 suitable for? Which PTZ interface can be mounted to?

It is compatible with Matrice 350 RTK and M300 RTK. The remote control is only compatible with DJI RC Plus. Before use, please upgrade the aircraft and remote controller to the latest firmware. L2 can only be mounted on the lower single gimbal interface. Please ensure that the gimbal component is connected to the USB-C interface on the right side of the bottom of the aircraft (when facing the nose), otherwise the surveying and mapping accuracy will decrease.

How big is the viewing field of Zenmuse L2’s lidar?

Repeated scan: horizontal 70°, vertical 3°
Non-repetitive scan: horizontal 70°, vertical 75°

What is the maximum range of Zenmuse L2?

The measuring range is:
250 meters (reflectivity 10%, 100 klx)
450 meters (reflectivity 50%, 0 klx). The
recommended operating altitude is 30 meters to 150 meters.

How many echoes does Zenmuse L2 have?

Five echo modes are provided: single echo (strongest echo), double echo, three echo, four echo, and five echo.

What is the point cloud data rate of Zenmuse L2?

Single echo: Maximum 240,000 points/second
Multiple echo: Maximum 1,200,000 points/second

How many scanning modes does Zenmuse L2 have? What scenarios are they suitable for?

Supports two scanning modes: non-repetitive scanning mode and repetitive scanning mode.
In repeated scanning mode, lidar can perform more uniform and higher-precision scanning to meet high-precision surveying and mapping requirements.
In the non-repetitive scanning mode, the penetration is stronger and more structural information can be obtained, which is suitable for power inspection, forestry survey and other operation scenarios.

What is the accuracy of Zenmuse L2 inertial navigation?

Heading accuracy: 0.2° in real time, 0.05° in post-processing
Roll/Pitch accuracy: 0.05° in real time, 0.025° in post-processing
Horizontal positioning accuracy: 1 cm + 1 ppm with RTK FIX
Vertical positioning accuracy: 1.5 cm + 1 with RTK FIX The ppm^{heading, roll, and pitch accuracy were measured at DJI’s outdoor experimental site and under the following conditions: Zenmuse L2 was mounted on Matrice 350 RTK and turned on, using DJI Pilot 2’s planar route to plan the route (turn on inertial navigation calibration), The RTK status is FIX, the relative flight altitude is 150 meters, the flight speed is 15 meters/second, the gimbal pitch is -90°, and each straight line segment in the route does not exceed 1500 meters.}

What is the use of the visible light camera of the Zenmuse L2?

When collecting point clouds, the visible light camera can provide real-time color information for the point cloud data, and the photos taken can be used for two-dimensional visible light model reconstruction; when there is no need to collect point clouds, the visible light camera can not only take pictures and videos, but also collect images. For 2D or 3D visible light model reconstruction.

How accurate is the surveying accuracy of Zenmuse L2?

The plane accuracy is 5 cm and the altitude accuracy is 4 cm.

^{Measured at the DJI outdoor experimental site and under the following conditions: Zenmuse L2 is mounted on Matrice 350 RTK and turned on, using DJI Pilot 2’s planar route to plan the route (turn on inertial navigation calibration) , use the repeated scan mode, the RTK status is FIX, the relative flight altitude is 150 meters, the flight speed is 15 meters/second, the gimbal pitch is -90°, each straight line segment in the route does not exceed 1500 meters, and the angular features of the ground objects are obvious , using exposed hard checkpoints conforming to the diffuse model. Use DJI Maps for post-processing, and turn on point cloud accuracy optimization during processing. Under the same conditions, if point cloud accuracy optimization is not turned on, the elevation accuracy is 4 cm and the plane accuracy is 8 cm.}

What size CMOS does the visible light camera of Zenmuse L2 use? What is the pixel size?

Using 4/3 CMOS, the pixel size is 3.3 μm × 3.3 μm.

Compared with the previous generation, what performance improvements does Zenmuse L2 have?

The performance of lidar has been improved. When the measured area or object is 100 meters away from the lidar, the spot size is about 1/5 of L1. The laser penetration performance has been greatly improved, and the range and ranging accuracy have been improved. The pixel size of the visible light camera has increased by 89% compared to the 2.4 μm × 2.4 μm of the L1. The inertial navigation accuracy is improved to 0.05° (real-time) and 0.025° (post-processing). LiDAR supports ranging function.

Field data collection

How efficient is the surveying and mapping operation of Zenmuse L2?

The maximum operating area of a single sortie can reach 2.5 square kilometers.

^{Measured when Zenmuse L2 is mounted on Matrice 350 RTK, flying speed is 15 meters/second, flying altitude is 150 meters, side overlap rate is 20%, inertial navigation calibration is turned on, altitude optimization is turned off, and ground-imitating flight is not turned on.}

What are the application scenarios of Zenmuse L2?

It can be widely used in terrain surveying, transmission line channel modeling, forestry survey, engineering survey and other fields.

What kind of SD card do I need for Zenmuse L2?

It supports microSD cards with a maximum capacity of 256GB, sequential writing speed ≥50MB/s, and transmission speed reaching UHS-I Speed Grade 3. The following models are recommended: Lexar 1066x 64GB U3 A2 V30 microSDXC Lexar 1066x 128GB U3
A2
V30 microSDXC
Kingston Canvas Go! Plus 128GB U3 A2 V30 microSDXC
Lexar 1066x 256GB U3 A2 V30 microSDXC

What does real-time point cloud modeling of Zenmuse L2 mean? What shading modes are supported? What model viewing operations are available?

During the process of collecting raw point cloud data, Zenmuse L2 can generate a point cloud model in real time through thinning processing, which can be displayed in real time in the DJI Pilot 2 app. Supports four coloring modes: reflectivity, height, distance, and true color. When entering the photo album to view the model on the remote control, operations such as rotation, dragging, zooming, quick viewing angle switching, and reverting are supported.

What route tasks does Zenmuse L2 support?

Supports waypoint routes, surface routes, and strip route tasks.

Does Zenmuse L2 need to be warmed up before flying?

No preheating is required. After powering on, the aircraft RTK is in FIX status and ready for takeoff.

Do I need to calibrate the inertial navigation when using Zenmuse L2?

In order to ensure the accuracy of collected data, inertial navigation calibration needs to be turned on. Before executing the route mission, please turn on “Inertial Navigation Calibration”. When flying manually, you can select “Click Calibration” to trigger the aircraft to perform inertial navigation calibration before operation, and then manually trigger inertial navigation calibration according to the countdown prompt during operation.

What is the function of Zenmuse L2’s assignment quality report?

The operation quality report records the valid data duration of each module of radar, camera, and inertial navigation. Operators can judge the effectiveness of data collection based on the module status.

What are the different formats of data saved in the SD card of Zenmuse L2?

CLC (camera radar calibration file)
CLI (radar IMU calibration file)
LDR (radar data)
RTK (main antenna RTK data)
RTL (RTK arm compensation data)
RTS (secondary antenna RTK data)
RTB (base station RTCM data)
IMU (inertial Import IMU raw data)
SIG (PPK signature file)
LDRT (point cloud file for app playback)
RPT (point cloud quality report file)
RPOS (real-time POS solution data)
JPG (photos taken during the flight)

Will there be any difference in accuracy when Zenmuse L2 is mounted on M300 RTK and Matrice 350 RTK?

When the RTK status is FIX, there is no difference in accuracy between the two.

During the operation, can the operator play back the point cloud results?

Can. Operators can view the current point cloud collection effect on the real-time point cloud display screen, and can also quickly preview the currently recorded point cloud 3D model. After the job is completed, you can download and view the point cloud 3D model in the album, and perform operations such as splicing multiple sorties of point cloud 3D models.

^{Model playback, splicing and other operations must be performed while the aircraft and L2 are connected.}

Are the 3D point cloud model in real-time preview and playback and the reconstructed model in post-processing matched 1:1?

It is not a 1:1 match. The 3D point cloud model during preview and playback has been thinned out. In terms of point cloud quantity and accuracy, it is different from the model reconstructed in DJI Maps.

Post-processing applications

How to perform high-precision modeling on the data collected by Zenmuse L2?

After opening DJI Map, create a new “Lidar Point Cloud” task, import the data from the SD card into DJI Map according to the operation requirements, complete the relevant settings, and then perform high-precision modeling.

In DJI Maps, what formats of results can be generated using Zenmuse L2 data?

Point cloud formats: PNTS, LAS, PLY, PCD, S3MB
Trajectory formats: sbet.out, sbet.txt

What new point cloud processing functions can be achieved with Zenmuse L2 and DJI Maps?

1. Supports ground point classification;
2. Outputs DEM elevation model;
3. Supports cloud PPK function (only applicable to mainland China), which can process L2 data where base station data is lost;
4. Adds new elevation accuracy control and inspection functions, supports The 1985 national elevation datum (only applicable to mainland China) and local coordinate systems are used to ensure that the results reach surveying and mapping accuracy; 5. The
thickness of the point cloud between air routes is optimized, making it thinner and more consistent;
6. The quality report information of the laser point cloud is more complete .

How to understand the reflectivity value in DJI Maps?

The reflectance range is 0 to 255, where 0 to 150 corresponds to 0 to 100% reflectivity under Lambertian diffuse reflection, and 151 to 255 corresponds to total reflection.

^{The reflectance value is related to many factors such as the surface topography of the ground object, lighting conditions and incident angle, and cannot form a strict correspondence with the absolute reflectance.}

How long can historical data be obtained when performing cloud PPK data processing?

Cloud PPK only supports pulling operation data within three months of mainland China.

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