Developer’s Quick Start with the Ouster Python SDK
This quickstart guide will walk you through visualizing Ouster sensor data quickly with Python code you write yourself. It assumes that you have followed the steps in Python Installation to install the Ouster Python SDK.
Using this Guide
You’ll want to start an interactive Python session and keep it open through the sections, as we’ll be reusing variables created in earlier parts while explaining what we’re doing as we go.
To get started, open a new console/Powershell window and start a python interpreter:
PS > py -3
Throughout this guide we will indicate console commands with
$ and python interpreter commands
>>>, just as we have above.
If you’d like to start by working with sample data, continue to the next section. If you’d prefer to start by capturing data from a sensor, you can skip to Using an Ouster Sensor below.
Using Sample Data
You can download sample data from the sensor documentation by clicking through the Ouster Data
App links and using the Download button. After download, you should have two files, a
We will use
SAMPLE_DATA_PCAP_PATH to refer to this pcap and
SAMPLE_DATA_JSON_PATH to this
json in the following. You may find it convenient to assign the paths appropriately in your
The downloaded pcap file contains lidar and imu packets captured from the network. You can read more about the IMU Data Format and Lidar Data Format in the Ouster Sensor Documentation. The JSON file contains metadata queried from the sensor TCP interface necessary for interpreting the packet data.
In your open python session, save the two paths to variables:
>>> pcap_path = '<SAMPLE_DATA_PCAP_PATH>' >>> metadata_path = '<SAMPLE_DATA_JSON_PATH>'
Because our pcap file contains the UDP packet stream but not the sensor metadata, we load the sensor
metadata_path first, using the client module:
>>> from ouster import client >>> with open(metadata_path, 'r') as f: ... info = client.SensorInfo(f.read())
Now that we’ve parsed the metadata file into a
SensorInfo, we can use it to read our
captured UDP data by instantiating
pcap.Pcap. This class acts as a
PacketSource and can be used in many of the same contexts as a real sensor.
>>> from ouster import pcap >>> source = pcap.Pcap(pcap_path, info)
To visualize data from this pcap file, proceed to Visualizations in 3D examples.
Using an Ouster Sensor
If you have access to sensor hardware, you can start reading data by
PacketSource that listens for a UDP data stream on
a local socket.
Connecting to an Ouster sensor is covered in the Networking Guide section of the Ouster Sensor Documentation.
In the following,
<SENSOR_HOSTNAME> should be substituted for the actual hostname or IP of your
To make sure everything is connected, open a separate console window and try pinging the sensor. You should see some output like:
$ ping -c1 <SENSOR_HOSTNAME> PING <SENSOR_HOSTNAME> (192.0.2.42) 56(84) bytes of data. 64 bytes from <SENSOR_HOSTNAME> (192.0.2.42): icmp_seq=1 ttl=64 time=0.217 ms
PS > ping /n 10 <SENSOR_HOSTNAME> Pinging <SENSOR_HOSTNAME> (192.0.2.42) with 32 bytes of data: Reply from 192.0.2.42: bytes=32 time=101ms TTL=124
Next, you’ll need to configure the sensor with the config parameters using the client module.
In your open python session, set
>>> hostname = '<SENSOR_HOSTNAME>'
Now configure the client:
>>> from ouster import client >>> config = client.SensorConfig() >>> config.udp_port_lidar = 7502 >>> config.udp_port_imu = 7503 >>> config.operating_mode = client.OperatingMode.OPERATING_NORMAL >>> client.set_config(hostname, config, persist=True, udp_dest_auto = True)
Just like with the sample data, you can create a
PacketSource from the sensor:
>>> source = client.Sensor(hostname, 7502, 7503) >>> info = source.metadata
Now we have a
source from our sensor! You’re ready to record, visualize to visualize data from your sensor, proceed to
Visualizations in 3D examples. Or you can check out other things you can do with a
source in the Python Examples & Concepts.
Now that you know the basics, you can check out our annotated examples for a more detailed look at how to work with our data.
Here are a few things you might be interested in: