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UAV LIDAR COMPARISON: ZENMUSE L1 VS. ZENMUSE L2



In the dynamic world of aerial technology, few breakthroughs have generated as much buzz as Drone Aerial LiDAR Systems. These state-of-the-art systems have shaped a new way of work across various sectors, from geospatial surveying and topography to environmental monitoring and infrastructure management. Their precision and operational efficiency have been a driving force for change. In this blog post, we identify the technological progression from the DJI Zenmuse L2 to its predecessor, the DJI Zenmuse L1 with an in-depth technological comparison:

Function


L2

L1

Efficiency comparison

L2 can cover an area of up to 2.5 square kilometers in a single mission at a relative altitude of 150 meters and a flight speed of 15 m/s.

(the relative altitude of the mission is 150m and the flight speed is 15 m/s)

L1, Operating at a 100-meter relative altitude and a flight speed of 13 m/s, can cover an area of up to 2 square kilometers. (the relative altitude of the mission is 100m and the flight speed is 13 m/s)

Echo

Supports 5 returns

Supports 3 returns

Point cloud data rate

Single return: Maximum 240,000 points/second

Multiple return: Maximum 1,200,000 points/second

Single return: maximum 240,000 points/second

Multiple return: Maximum 480,000 points/second

Spot size

L2 laser spot size is 4 x 12 cm @ 100 meters, only 1/5 of L1

Ground Point Cloud Penetration

Under similar environmental and flight conditions, L2 offers a ground point density that is more than three times greater than that of L1.

Results accuracy

Vertical accuracy: 4cm

Horizontal accuracy: 5 cm (the relative altitude of the mission is 150 m and the flight speed is 15 m/s)

Vertical accuracy 5 cm

Horizontal accuracy 10 cm (The relative altitude of the mission is 50m and the flight speed is 10 m/s)

Point cloud thickness

Under the same environment and flight parameters, the thickness of L2 point cloud is 1/3 of L1

Key Takeaways:

  1. Under the same accuracy conditions (1:500 resolution): L2 operates at a typical height of 150 meters and covers an area of 2.5 square kilometers per sortie. L1 operates at a height of 50 meters, covering an area of 0.5 square kilometers per sortie.

  2. This results in a five-fold increase in single mission efficiency for L2.

  3. Compared with L1, L2's penetration is greatly improved.

  4. When operating at the same altitude of 150 meters, L2 provides satisfactory accuracy with an elevation accuracy of 4 cm and horizontal accuracy of 5 cm, while L1's accuracy exceeds 20 cm. This means that L2 offers a four-fold improvement in result accuracy compared to L1.



L2 showcases significantly enhanced efficiency, with the ability to cover a larger area per mission, achieving a five-fold increase in single mission efficiency when operating under the same accuracy conditions. Its improved echo capabilities, featuring support for five returns, lead to more comprehensive point cloud data rates. The L2's smaller laser spot size and ground point cloud penetration superiority further differentiate it from L1, providing remarkable accuracy improvements. These enhancements translate to a four-fold improvement in result accuracy, making L2 a notable advancement in the field of aerial LiDAR technology.

Software

Function

L2

L1

Pilot

Split screen display

Supports three real-time display modes: visible light, point cloud, point cloud/visible light split screen

​Supports three real-time display modes: visible light, point cloud, point cloud/visible light split screen

Pilot

Point cloud mapping playback

Support

No Support

Pilot

Multi-flight point cloud 3D model stitching

Support

No Support

Pilot

2D map point cloud

Support

No Support

Pilot

Field quality report

Support

No Support

DJI Terra

Point cloud generation with one click

Support

No Support

DJI Terra

Ground point classification

Free Support

Suppport

DJI Terra

DEM one-click generation

Free Support

Suppport

DJI Terra

Point cloud profile analysis

Free Support

Suppport

DJI Terra

Point cloud quality analysis report

Free Support

Suppport

Key Takeaways:

  1. ​L2 supports quick acquisition and viewing of point cloud quality and thinning model results through the remote control in the field;

  2. Keep abreast of data collection status. Improve overall operational efficiency

  3. Field quality report;

  4. After L2 collects data, it can be post-processed for free through DJI Terra;

  5. L1 advanced functions are only supported by the surveying and mapping edition, electric power edition, and cluster edition.



The advantages the L2 offers not only extend to its data collection capabilities but also to the post-processing and analysis functionalities. L2 stands out with its split-screen display options, making real-time data analysis more versatile. It also supports advanced features like multi-flight point cloud 3D model stitching, 2D map point cloud generation, and field quality reporting, which are not available with L1. The seamless integration with DJI Terra for post-processing, as well as the provision of various free support features such as ground point classification, DEM one-click generation, and point cloud quality analysis, set L2 apart as a robust and comprehensive solution.

Function

L2

L1

Measure distance

250 meters (reflectivity 10%, 100 klx)

450 meters (reflectivity 50%, 0 klx)

190 meters (reflectivity 10%, 100 klx) 450 meters (reflectivity 80%, 0 klx)

Laser ranging

Supported, up to 450m

No Support

FOV

Repetitive scan: 70°x3°;

Non-repetitive scan: 70°x75°

Repetitive scan: 70.4°x4.5°;

Non-repetitive scan: 70.4°x77.2°

IMU warm-up

No need to warm up before takeoff

Warm up for 5-10 minutes before takeoff

Inertial navigation calibration

Manual route: 200s;

Automatic route: 100s

Manual route: 120s;

Automatic route: 100s

Yaw accuracy

Real-time 0.2°, post-processing 0.025°

Real-time 0.3°, post-processing 0.15°

Pitch and roll accuracy

Real-time 0.05°, post-processing 0.025°

Real-time 0.05°, post-processing 0.025°

Visible light camera sensor size

4/3 inches

1 inch

Visible light camera effective pixels

20M

20M

Mechanical shutter life

200,000 times

50,000 times

Visible light camera photo interval

0.7 seconds minimum

2 seconds minimum

Various route types

Support

Support

Point cloud real-time preview

Support, point cloud rendering optimization

Support

Key Takeaways:

  1. Compared with L1, the measuring range of L2 is increased by 30%:

  2. The typical operating altitude can reach 150m, the detection range is longer, and the flight is safer.

  3. Inertial navigation does not require preheating, which increases the effective time of the operation;

  4. The accuracy of inertial navigation has been improved, the manual route inertial navigation calibration interval has been increased by 67%, and the effective operation time has been increased.

  5. The life of the mechanical shutter is increased by 4 times;

  6. The shortest photo interval supports 0.7 seconds, and only performing orthophoto operations can greatly improve efficiency;

  7. Point cloud real-time preview has a better look and feel.

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