Leica GS18 I GNSS RTK rover utilises highly innovative Visual Positioning technology based on integration of GNSS, IMU and a camera. With Visual Positioning, users can capture areas of interest from a distance and measure points from images. It enables you to measure points from images with survey-grade accuracy either in the field or in the office.
The office workflow for GS18 I is based on Infinity. Users can measure single points or create a point cloud from the data. Here is a quick workflow.
Import and visualise GS18 I data in the project
To import the GS18 I data, simply select the Import from the ribbon. In the Import dialog, highlight the DBX file and select Import. Zoom, rotate and pan in the graphical view to get an overview of the imported data and images. The imported Image Groups and associated images are listed in the Library object’s list in the Navigator.
Image 1: GS18 I images imported into Infinity
Measure Points from images
To measure points, highlight the Image Group in the Navigator and from the context menu select Open Viewer. In the Image Viewer, navigate to the desired image and measure new points. Zoom and pan to the required positions or use the magnifier for a closer look. A single click chooses the point and the same feature is automatically identified from the other images. Created points are listed in the Points View pane and can be viewed in the images.
Image 2: Measuring points from images in the Image Viewer
Merge image groups
The Merge Image functionality is useful to combine two or more Image Groups. It allows creating a single point cloud from multiple image groups. In the Imaging tab of the ribbon, use New to create a new Image Group. A new group will be added in the object Library in the Navigator. In the Navigator or Inspector, highlight the required Image Groups and right-click to open the context menu. Select Merge to Image group and select created Image Group. All images from the previously selected Image Groups now belong to the merged Image Group.
Create a Dense point cloud
Creating a dense point cloud from data captured with GS18 I follows the same steps as creating a point cloud from UAV data. Before creating the Dense Point Cloud, define the Settings from the Imaging tab in the ribbon. Specify the Filtering threshold and the Min. Number of Matches per Point to better handle outliers or poor-quality data . The Dense point Cloud can be created by selecting the image group and choosing Dense Point Cloud from the ribbon or the context menu. The processing task starts and can be viewed in the Imaging Results section of the Inspector Imaging tab. Once the task is completed, it is moved to results section. Store the results to visualise the Dense Point Cloud in the View pane and Navigator.
Image 3: Dense Point Cloud of a building elevation generated from GS18 I images
Move the on-site work to the office and measure points from images. Watch the video to learn how to work with the GS18 I data in more details.
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Product Engineer, Leica Infinity