pointcloudset

Analyze large datasets of point clouds recorded over time in an efficient way.

Code | Documentation

Features

• Handles point clouds over time
• Building complex pipelines with a clean and maintainable code

newpointcloud = pointcloud.limit("x",-5,5).filter("quantile","reflectivity", ">",0.5)

• Apply arbitrary functions to datasets of point clouds

def isolate_target(frame: PointCloud) -> PointCloud:
   return frame.limit("x",0,1).limit("y",0,1)

def diff_to_pointcloud(pointcloud: PointCloud, to_compare: PointCloud) -> PointCloud:
   return pointcloud.diff("pointcloud", to_compare)

result = dataset.apply(isolate_target).apply(diff_to_pointcloud, to_compare=dataset[0])

• Includes powerful aggregation method agg similar to pandas

dataset.agg(["min","max","mean","std"])

• Support for large files with lazy evaluation and parallel processing

• Support for numerical data per point (intensity, range, noise …)
• Interactive 3D visualisation

• High level processing based on dask, pandas, open3D and pyntcloud
• Docker image is available
• Optimised - but not limited to - automotive lidar
• Directly read ROS files and many pointcloud file formats
• A command line tool to convert ROS 1 & 2 files

Use case examples

• Post processing and analytics of a lidar dataset recorded by ROS
• A collection of multiple lidar scans from a terrestrial laser scanner
• Comparison of multiple point clouds to a ground truth
• Analytics of point clouds over time
• Developing algorithms on a single frame and then applying them to huge datasets

Installation with pip

Install python package with pip:

pip install pointcloudset

Installation with Docker

The easiest way to get started is to use the pre-build docker tgoelles/pointcloudset.

Quickstart

from pointcloudset import Dataset, PointCloud
from pathlib import Path
import urllib.request

urllib.request.urlretrieve("https://github.com/virtual-vehicle/pointcloudset/raw/master/tests/testdata/test.bag", "test.bag")
urllib.request.urlretrieve("https://github.com/virtual-vehicle/pointcloudset/raw/master/tests/testdata/las_files/test_tree.las", "test_tree.las")

dataset = Dataset.from_file(Path("test.bag"), topic="/os1_cloud_node/points", keep_zeros=False)
pointcloud = dataset[1]
tree = PointCloud.from_file(Path("test_tree.las"))

tree.plot("x", hover_data=True)

This produces the plot from the animation above.

• Read the html documentation.
• Have a look at the tutorial notebooks in the documentation folder
• For even more usage examples you can have a look at the tests

CLI to convert ROS1 and ROS2 files: pointcloudset convert

The package includes a powerful CLI to convert pointclouds in ROS1 & 2 files into many formats like pointcloudset, csv, las and many more. It is capable of handling both mcap and db3 ROS files.

pointcloudset convert --output-format csv --output-dir converted_csv test.bag

You can view PointCloud2 messages with

pointcloudset topics test.bag

Comparison to related packages

1. ROS - bagfiles can contain many point clouds from different sensors. The downside of the format is that it is only suitable for serial access and not well suited for data analytics and post processing.
2. pyntcloud - Only for single point clouds. This package is used as the basis for the PointCloud object.
3. open3d - Only for single point clouds. Excellent package, which is used for some methods on the PointCloud.
4. pdal - Works also with pipelines on point clouds but is mostly focused on single point cloud processing. Pointcloudset is purely in python and based on pandas DataFrames. In addition pointcloudset works in parallel to process large datasets.

Citation and contact

Thomas Gölles email: [email protected]

Please cite our JOSS paper if you use pointcloudset.

@article{Goelles2021,
  doi = {10.21105/joss.03471},
  url = {https://doi.org/10.21105/joss.03471},
  year = {2021},
  publisher = {The Open Journal},
  volume = {6},
  number = {65},
  pages = {3471},
  author = {Thomas Goelles and Birgit Schlager and Stefan Muckenhuber and Sarah Haas and Tobias Hammer},
  title = {`pointcloudset`: Efficient Analysis of Large Datasets of Point Clouds Recorded Over Time},
  journal = {Journal of Open Source Software}
}