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Quick Terrain Modeler Analysis Capabilities
Analysis Tools
Description
Basic Mensuration
Flexible tool for measuring terrain and analyzing complex cross sections by placing a simple or compound mensuration line in the terrain. Produces linear or point cross sections. Gives the ability to "step" through the terrain.
Line of Sight

Visually defines a viewshed. The user places a marker in the terrain, sets viewer and target heights, and determines what terrain is visible from there as well as what areas of the terrain have visibility to the marker. This analysis can be compounded for multiple viewpoints, limited to a specific range, or modeled from a particular sensor's viewing capability (filed of view & orientation). Due to export restrictions, available in US versions only.

Line of Sight can also be performed as a vector analysis and visualized interactively down a known travel route, thus identifying visibility to specific locations from any point on the route.

Grid Statistics Grid statistics is a powerful, fast, flexible, and visual tool that provides Quick Terrain Modeler users a way to statistically sort through their LiDAR or 3D data in almost any way imaginable. The user simply loads data, whether point cloud or gridded surface model, sets a grid size, selects a variable to investigate, a statistic to calculate, a way to display it, and (optionally) an action to perform on it. (Analysis Menu)

· Variables Supported: Z (Height), Intensity, Number of Points, Point Density, Alpha
· Statistics calculated for each grid cell: Minimum, Maximum, Mean, Range , Deviation, Slope, Aspect
· Statistical Display Options: Continuous Color Band (Blue to Red), Earth Tones (13 segments – no ramp), Color Wheel, User customizable
· Actions : Export, cut, or decimate by statistical bands. Save GeoTIFFs of either statistical values or color values. Save/load statistical profiles.
Above Ground Level (AGL) Analysis Because many users would rather work with relative, Above Ground Level (AGL) heights rather than absolute elevations, Quick Terrain Modeler includes a powerful tool called AGL (Above Ground Level) Analyst. Some of the most common reasons for wanting to work in AGL space are to measure tree and roof heights, to measure the height of potential vertical obstructions (VO’s), and to selectively remove vegetation and canopy from a point cloud, thus enabling the user to see and identify objects under foliage or other obstructions. This tool calculates and assigns an AGL elevation value, in addition to an absolute elevation value, to every point in a point cloud or every vertex in a surface model. The simple steps of AGL Analyst are as follows:

1. Calculate AGL heights of every point either by comparing to a bare earth model (if available) or by quickly estimating a ground surface.
2. Once AGL Values are calculated, apply a color scheme based on AGL heights, rather than absolute heights.
3. Exploit the AGL model by querying points for their AGL heights, clipping data based on height AGL (i.e., temporarily removing points based on their heights above ground), and swapping the AGL elevation values with the absolute elevation values, and displaying an AGL height legend.

4. Since Alpha Filtering (Analysis Menu) is the mechanism for clipping by AGL, the alpha filtering interface has been modified to offer more options in filtering based on alpha (i.e., AGL heights). Users can now enter values manually or filter “equal to” specific values.
5. Export products such as the 3D ground estimate, an ASCII file of the AGL points, and point clouds edited by AGL values.
Flood Simulation
Simulate terrain flooding in real time. Draw a contour line around water perimeter. Export flood contour as a shape file or a DXF polyline.
Slope Analysis
Color terrain by user-selected steepness (i.e., highlight steep or flat terrain). Use slope filter to further refine slope analysis by filtering on area or slope banding.
Change Detection
Compares two DEM's and highlights changes in the terrain. QT Modeler has two types of change detection - binary and continuous color. Binary shows whether the terrain has changed or not, based on a user defined change in elevation threshold. Continuous color shows a severity of change (e.g., impact of a hurricane on a coastline) in a continuous color map. Binary change detection can be enhanced with a change detection filter that filters changes based on volume or elevation change
Helicopter Landing Zone (HLZ) Analysis This tool assists in identifying candidate locations for Helicopter Landing Zones (HLZ’s) based on user specified parameters of slope and minimum radius. Should be used in conjunction with Line of Sight and point interrogation of point cloud data.
Volume Analysis
Calculate the volume of a specified area of the DEM as compared to another DEM or as compared to a reference plane.
Grid Lines Dramatically enhanced grid lines tool to support DoD needs for 3D MGRS map visualization. The user can now draw MGRS grid lines across 3D models, customize the display, and export the grid lines as sampled 3D shapefiles.
Contour Lines Creates custom contour lines. Can export contour lines as shape files or as dxf polylines.
Shadow Map Create a shadow map of the terrain based on user defines lighting settings.
Point Cloud Mensuration Measure distances between two specific points in a point cloud.
Area Interrogation
Query the attributes (e.g., min/max X,Y and Z, number of points, etc.) of a subsection of the DEM.
Cross Section Export
Export sampled cross sections as an ASCII text file. Can be imported into other applications for analysis.
Multiple Parallel Cross Section Tool
Generate multiple parallel cross sections to compare and/or export.
Outline Generation Generates an outline of the survey. Outline can then be saved and exported as a shape file to GIS. This is an excellent way to assess survey coverage. Outlines can be exported to Google Earth/KML.
Shape File Support Import shape files to be used as mensuration lines, selection areas, and/or markers. Save mensuration lines, selection areas, and markers as shape files to be exported to GIS.