1. Introduction
In this article we will explain step by step how to process a TrueView GO (TVGO) handheld mapping dataset in LP360. The idea of the article is to serve as a quick user guide on processing. This article will not explain in detail each of the settings available in each step, that can be found either in the help section or in the LP360 Land User guide.
2. Import
- Open LP360 2024.2.55 or newer.
- Select “Import Raw Missions into New Project…”
- Select “TrueView GO”.
- Press “Folder” to import the raw data from the sensor. You can select 1 or more cycles (datasets) to be process in the same project.
Note: the very first time you select TVGO data the software will ask you to install the LP360 sensor extension.
- Now, select the processing mode in the "RTK/PPK Mode" column. There are 3 different types:
- SLAM--> dataset acquired in a local coordinate system
- RTK --> dataset georeferenced with a global coordinate system. The user needs to select the RTK Geographic CRS. The most common geographic CRS are: "WGS84 + Ellipsoidal" (world), "NAD83(2011) + Ellipsoidal" (CONUS) and "ETRS89 + Ellipsoidal" (Europe).
- PPK --> dataset georeferenced with a global coordinate system, it requires a base station. The user needs to select a rinex file and the coordinates of the base station.
- Press Next.
- Select the Project Root Folder and the Project Name.
- Select the desired CRS.
Tip: Select "Local Coordinate system" for SLAM datasets
- Press Next –> The summary will be display –> Press next.
- Data imported.
3. Point Cloud generation
Once the cycles are imported into LP360, it will start automatically processing the raw data.
3.1. Job manager
- Go to "Sensor" ribbon -->"Job Manager".
- Wait until the processing has completed and the job is in the Ready state, then select the job and press "Complete Job".
- In older version, there is a message asking if you want to proceed with creating "Flight Lines" or "Post Processing". Tip: If you want to filter based on the trajectory, select "Create Flight Lines". It is possible to access "Auto Create Flight Lines" and "Post Processing" from the "Sensor" tab of the ribbon later, if desired.
- The point cloud is generated without filters.
3.2. Post Processing to filter the point cloud
- Go to Sensor ribbon –> Post Processing tool.
- Select the Clip Angle. Tip: Disable the filter for TVGO since we want to use the full 360° FOV of the sensor.
- Select the Clip Range.
- Run Post Processing …
- Post processing point cloud is generated.
Note:
What is the difference between the point cloud directly from the TGO in job manager and the post processing?
Both point clouds come from the same raw data, however one has all the data captured from the sensor (TGO point cloud) and the other is filtered by the defined "flight lines" and filters of the "Post Processing" tool.
In the following example it is possible to see how the clip range filter has removed long range points captured by the sensor. Recall the TVGO has a range of up to 80 meters.
After this step we recommend continuing with the TrueView recommended workflow. Some of the steps recommended are:
If you have multiple TVGO datasets, it is highly recommended to perform "Registration" before doing any additional processing.
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