FAQ about LiDAR

Q1:What is LiDAR?

A1: LiDAR is the abbreviation of "Light Detection and Ranging", which is a method of ranging and imaging using lidar technology. It measures the distance and shape of objects by firing laser pulses and recording their return times. The laser beam returns to the sensor after being reflected from the surface of the illuminated object, and the sensor records the time and direction of the reflected laser light, thereby determining the position and shape of the object. LiDAR systems usually include components such as laser transmitters, receivers, control systems, and data processing units.

Q2:What is the minimum required field of view for radar?

A2:It is recommended that at least more than 220 degrees be required.

Q3: What issues should be paid attention to when installing the radar?

A3:Radar horizontal installation angle: 0 degrees ~ +2 degrees (tilt upward)

Radar scanning opening angle: 270 degrees or more is recommended, and it is best to have openings in front of and behind the robot. At least it needs to be greater than 220 degrees.

Radar blind area: 15cm. It is recommended that the radar be installed slightly closer to the center of the chassis structure to reduce the blind area.

Q4:Operate the RPLIDAR A1 radar according to the user manual, why can't it be used?

A4:①The USB power supply is insufficient; ②It is recommended to reinstall the serial port driver.

Remarks: In this case, the A1 lidar (SKU: DFR0315) will appear more frequently, and the A2 lidar (SKU: DFR0445) is equipped with USB and power supply, so the above problems are unlikely to occur.

Q5: What platforms does SLAMTEC Mapper support??

A5: SLAMTEC Mapper (SKU:DFR0628)  supports use on Windows, Linux, Android, and iOS. For specific usage methods, please go to the official website [www.slamtec.com] - [Download and Support] page to download the relevant platform SDK.

Q6:Why can't SLAMTEC MAPPER M2M2 build a map?

A6:1. Check whether the power supply is installed firmly, and press the socket of the power cord tightly, that is, the socket may be stretched for a long time, resulting in poor contact.

2. After walking a circle, walk halfway again to form a closed loop. Only in this way can the starting point and the ending point be coincident and the accuracy of the map can be ensured. Mapping requires a small closed loop and then a large closed loop to ensure the accuracy of the map.

Q7:How to view lidar data?

A7:There are many software tools available for viewing and analyzing LiDAR data. Some of the most popular tools include CloudCompare, QT Modeler, FUSION, and ArcGIS. These tools provide various functionalities, such as point cloud visualization, filtering, segmentation, and analysis.

Q8:How to visualize lidar data and what are the common data analysis techniques?

A8:LiDAR data can be visualized using various techniques, including color mapping, point size, and transparency. Color mapping involves assigning colors to the points based on their height, intensity, or other attributes. Point size can be used to represent the density or importance of the points, while transparency can be used to reveal hidden details in the data.LiDAR data can be analyzed using various techniques, such as segmentation, classification, and feature extraction. Segmentation involves dividing the point cloud into meaningful segments, such as buildings, trees, and roads. Classification involves assigning labels to the segments based on their characteristics, such as vegetation, ground, or buildings. Feature extraction involves identifying and extracting specific features, such as the height of trees, the slope of terrain, or the curvature of surfaces.

Q9:How to view lidar maps?

A9:LiDAR map data can be obtained from various sources, such as government agencies, research institutions, and commercial providers. Some of the most common sources include the USGS 3D Elevation Program (3DEP), the National Oceanic and Atmospheric Administration (NOAA), and commercial providers such as Esri and Google. These sources provide lidar map data for different regions and purposes, and may require a fee or license agreement for access.There are many software tools available for viewing and analyzing LiDAR maps. Some of the most popular tools include ArcGIS, QGIS, and FUSION. These tools provide various functionalities, such as point cloud visualization, terrain modeling, and 3D analysis. In addition, some online platforms such as OpenTopography and Sketchfab offer interactive visualization of  LiDAR map data.

Q10:How should I choose the right lidar product?

A10: Up to now, DFRobot has launched several LiDAR series products. Faced with so many options, we have launched the LiDAR Selection Reference Guide, which introduces the characteristics of each LiDAR in detail to help you choose.

For details, please refer to: Solid State LiDAR (Laser Radar) Selection Guide；Mechanical LiDAR (Laser Radar) Selection Guide
 

If you have other questions, just feel free to post them in our forum for consultation. We will reply them as soon as possible and improve the product FAQ gradually.