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Questions tagged [lidar]

LIDAR (Light Detection And Ranging) is an optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target.

If the question is not solely about programming it might be suitable on gis.stackexchange.com

Programming questions related to lidar geospatial data are also welcome on GIS SE.

429 questions
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Ransac ground plane segmentation for lidar data

I want to use the ransac algorithm to segment the ground plane lidar rings, I use the python-pcl to do that, but I got the false results as the pictures showed below. As we known, the lidar data has many rings of the ground plane, it can't find the…
Jaiy
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KITTI dataset crop labelled point cloud

I am trying to train my model to recognize car, pedestrian and cyclist, it requires the cyclist, car and pedestrian point cloud as the training data. I downloaded the dataset from KITTI…
Hon Lin
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Dstance measurement using LidarLite- python code

The following is the python code I received from some source. They defined a class called GLLv3 in the code. i can execute the program. But nothing happened with my lidar sensor. Do I need to create an object of the class or are we expecting that…
master_yoda
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LiDAR Velodyne Veloview PointCloud Data

I'm new to this .. I am working on some mapping project and I need help filtering LIDAR pointcloud data. I have two questions and i hope you can help in this: 1) Can you use Veloview to filter Point Cloud data? Can you crop the data captured?…
Ish
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Identifying x, y coordinates in the same row and are closest to 1000, 2000 respectively

I have a pandas dataframe with x,y columns containing coordinates. These coordinates are ground lidar point cloud coordinates. I would like to find the scan position coordinate of x closest to 1000 and y coordinate closest to 2000 ( original scan…
Sher
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Creating a GUI for Point Cloud Visualization

I have this very simple tool that visualizes lidar sensor data online using Opencv. I want to create a GUI for it but I am a noob in the area. Any suggestions for material or examples? The GUI needs to do only two things for now: Take the sensor…
kav
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Download multiple CSV files (Lidar data), give a name to the columns and join every files

Hi to the R community! I'm a new R user and after hours of searching how to do, I hope you would help me to solve my problem and understand where is/are the mistake(s). So, I have Lidar data from the french Litto3D programm. I need to use twelve…
Ally U.
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Create subplots from interactive python plot

I have some LVIS Lidar data in hdf5 format. The data has Lat and Long co-ordinates, so I have been able to visualise them on a map using Basemap: f = h5py.File('ILVIS1B_GA2016_0304_R1701_043591.h5','r') LONG = f['/LON0/'] LAT = f['/LAT0/'] X =…
GeoMonkey
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Type mismatch using C with cnpy library

I am trying to implement https://github.com/bostondiditeam/MV3D/tree/master/src/lidar_data_preprocess/npyConverter . I tried to compile the code with various versions of cnpy but fail each time with mismatch error even though the passed parameters…
Laisha Prakash
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Ubuntu/MacOS cannot see RPLidar

I did all steps having the Manual of RPLidar of RPLidar, but Ubuntu and MacOS cannot connect to RPLidar and give some error like this: Failed to connect to the sensor due to: [Errno 2] could not open port /dev/ttyUSB0: [Errno 2] No such file or…
muzafako
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Obtaining morethan 360 points from sweeping lidar

I mounted my lidar on a Pan and Tilt Servo Motor and trying to do the same thing just like in this site (Lidar Lite distance measurement and creating point cloud). What I do to obtain the data is that, for every 1degree rotation of the servo motor I…
Ramah Wart
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Acquiring data from LeddarVu8 Lidar using Arduino

I'm working on a room visualization project, similar to this (taken from this video): Im using LeddarVu8 from leddartech (see image below), arduino uno (with rs485shield): I've also used the code provided from leddartech of simple16channel (no…
Ramah Wart
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Not getting good reflection readings on lidar(VLP-16)

I mounted VLP-16 on the roof of my car while driving, I was expecting the lidar can detect the lanes on the ground since the white lines should have higher reflectivity. But in fact I cannot see any patterns on the ground. screenshot of rviz The…
PWCTW
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Can raspberry Pi 3 and Lidar lite v3 connecting without resistor in circuit?

I recently try to use Lidar Lite v3 with my Rpi 3, and it works with I2C communication. My wiring method is due to offical documentation. Wiring picture However, what I have learned before is that the gpio pin of RPI can only afford 3.3v working…
fevemania
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PDAL Reader.las and Writer.las error

I am trying to read and write LAS (*.las) file using PDAL but getting the below warning messages and the reading/writing is not being done correctly by PDAL reader and writer for las files. (pdal pipeline readers.las Warning) C:/denoise\lake.las:…
Hassam Ali
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