Quick Terrain Modeler: Mastering The Pan Function

Quick Terrain Modeler is a powerful tool for LiDAR data exploitation and 3D modelling. This software has a range of applications, from photogrammetric UAS (drone) systems to advanced point cloud analysis. With Quick Terrain Modeler, users can import and load 3D data, perform measurements and analysis, and even create fly-through movies. The software also offers a range of customisation options, such as hotkeys and shortcuts, colour palettes, and special overlays. This introduction will cover the basics of getting started with Quick Terrain Modeler, including an overview of the software, loading 3D data and 2D imagery, and some of the key features and functionality that make Quick Terrain Modeler a popular choice for terrain modelling.

Loading 3D data and 2D imagery

Quick Terrain Modeler is a 3D point cloud and terrain exploitation software package. It is designed for use with LiDAR but can accommodate any 3D data source. The software allows users to work with large 3D data sets, quickly analyse data, and export a wide variety of products with minimal training and experience. Quick Terrain Modeler can load data from multiple sources into the same 3D scene and understands all coordinate systems and vertical datums.

To load 3D data and 2D imagery in Quick Terrain Modeler, you can use the Drag 'n' Drop, Add Model, Find, and Import functions. The software also provides access to huge online and local data repositories through the QT Explorer and Web Mapping Service features.

The QT Explorer feature allows users to search, browse, discover, and download geospatial data. The Web Mapping Service enables streaming of data.

Quick Terrain Modeler supports OBJ mesh files, enabling Geospatial Augmented 3D (GA3D). This allows users to augment 3D scenes with scale 3D objects to represent features that were not in the original scene or were too small to be captured by LiDAR.

The software also includes a Point Cloud Toolkit (PCT) that allows users to merge, crop, and load data subsets directly into the QT Modeler.

Importing 3D data

Quick Terrain Modeler is a 3D point cloud and terrain exploitation software package. It is designed for use with LiDAR but can accommodate any 3D data source. The software allows users to work with large 3D data sets, quickly analyse data, and export a wide variety of products. Quick Terrain Modeler can load data from multiple sources into the same 3D scene.

The process of importing 3D data involves dragging and dropping files, using the "Add Model" and "Find" functions, and importing data directly from online and local data repositories. The software supports OBJ mesh files, enabling Geospatial Augmented 3D (GA3D). This allows users to augment 3D scenes with scaled 3D objects to represent features that were not in the original scene or were too small to be captured.

Quick Terrain Modeler understands all coordinate systems and vertical datums, easily converting between them and loading data in multiple coordinate systems into a single, coherent 3D scene.

Cleaning 3D data

Quick Terrain Modeler is a 3D point cloud and terrain exploitation software package. It is designed for use with LiDAR but can accommodate any 3D data source. The software allows users to work with large 3D data sets, quickly analyse the data, and export a wide variety of products. Quick Terrain Modeler is able to load data from multiple sources into a single, coherent 3D scene.

To clean 3D data in Quick Terrain Modeler, you can follow these steps:

• Edit Mode Toolbar and Capabilities: Familiarise yourself with the Edit Mode Toolbar, which allows you to manipulate and modify 3D data.
• Multiple Cut/Crop Methods: Utilise the various cut and crop methods to remove unwanted portions of the 3D data.
• Filtering/Decimating Data: You can spatially filter and decimate data to reduce noise and focus on specific areas or attributes.
• Smooth, Flatten, and Edit Planes: Smooth out irregularities, flatten surfaces, and edit planes to create a uniform base for your 3D data.
• Colour Sampling for RGB: Adjust the colours of your 3D data to ensure a consistent and accurate representation.
• Profile Analysis Tool Editing: Use the Profile Analysis Tool to view, measure, and edit data in the profile window, allowing for precise modifications.

By following these steps, you can effectively clean and refine your 3D data within Quick Terrain Modeler, taking advantage of its intuitive tools and capabilities.

Assessing 3D data

Evaluate Geotags and Header Information:

Start by examining the geotags associated with the 3D data. Geotags provide spatial information, such as latitude, longitude, and elevation, which is essential for accurate positioning in QTM. Additionally, review other header information included with the data, as it may contain important metadata or details about the data source.

Correct Coordinate System Information:

Ensure that the coordinate system information is correct and consistent across your 3D data. Verify the projection, datum, and units used, as errors or inconsistencies can lead to misalignment or distortion in your models.

Model Level Information and Histograms:

Pay close attention to the model-level information, which includes details about the 3D model's structure, format, and any associated metadata. Histograms can provide visual representations of data distribution, helping you identify potential issues or anomalies in the 3D data.

Identify Point Level Attributes:

Explore the point-level attributes within your 3D data. These attributes describe individual data points and can include information such as elevation, intensity, and return number. Understanding these attributes is crucial for data analysis and manipulation in QTM.

Color/Filter Data Based on Attributes:

Utilize the attribute information to color-code or filter your 3D data. This allows for a more intuitive visualization and analysis of the data. For example, you can choose to display data points with specific attributes in distinct colors, making patterns or variations easier to identify.

Convert Coordinate Systems:

If necessary, convert the coordinate system of your 3D data to match the required format or projection in QTM. This step ensures compatibility and allows for seamless integration with other data sources or tools within the software.

By following these steps, you can effectively assess and work with 3D data in Quick Terrain Modeler. Remember that accurate data assessment is the foundation for successful terrain modeling and analysis, so take the time to thoroughly review and understand your data before proceeding with further modeling steps.

DEM/DSM exploitation

A Digital Elevation Model (DEM) is a 3D computer graphics representation of elevation data to represent terrain or objects on a planet, moon, or asteroid. DEMs are often used as a generic term for Digital Surface Models (DSMs) and Digital Terrain Models (DTMs).

DEMs are used frequently in geographic information systems (GIS) and are the most common basis for digitally produced relief maps. They are also used for hydrologic modelling, terrain stability, and soil mapping.

A DSM captures the natural and built features on the Earth's surface, including the top of buildings, tree canopy, powerlines, and other features. DSMs are useful in 3D modelling for telecommunications, urban planning, and aviation.

A DTM represents specifically the ground surface and may include natural features such as rivers and ridges. DTMs are often required for flood or drainage modelling, land-use studies, and geological applications.

DEMs, DSMs, and DTMs are three commonly implemented geospatial features generated with UAV mapping systems. Each model uses different methodologies and delivers different elevation values. Selecting the right elevation model for your project is important.

• Shadow maps
• Slope and contours
• Change detection and volume calculation
• Travel route analysis tool
• Cross-section analysis tool
• Raindrop and water level tool
• Line of sight (USA only)

Frequently asked questions