2.6 Analysis Menu
Last updated
Last updated
The analysis menu mainly includes the following functions: Precision Check, γ, Label, γ Measurement,γExcavation Measurement.
The Precision Check feature plays a critical role in 3D GIS applications by allowing users to verify the model's accuracy using external checkpoints and generate detailed accuracy reports. This feature is handy in scenarios where model accuracy must be ensured, such as urban planning, terrain analysis, architectural design, and other fields.
Launch the accuracy check function
When you click the [Precision Check] button, the system will display the corresponding interface. In this interface, users can load the control point file and select the corresponding control points on the model.
Load Control Point File
When you click the Browse button behind the checkpoint file, the system will pop up the file selection dialog box. The user must select the existing checkpoint file. The file should meet the specific format requirements: each column represents the point number, east coordinates, north coordinates, and elevation, and spaces separate the columns.
Selecting and Viewing Checkpoints
After loading the checkpoint file, each checkpoint's point number and coordinate information are displayed in the list. Users can double-click a checkpoint in the list to make the model jump to the corresponding position and mark the point's position in the external coordinates with a green flag.
Measuring Model Coordinates
Click on the model to get the checkpoint's model coordinates. These coordinates are recorded in a list, and the clicked position is marked with a yellow flag. The system automatically calculates the difference between the field and model coordinates.
Calculate the error
After measuring the model coordinates of all checkpoints, the system calculates each point's plane and elevation errors and automatically counts the median errors of plane and elevation.
Filter checkpoints
Users can enter keywords in the query box and click the search button. The list will automatically filter out checkpoints unrelated to the keywords, making it convenient for users to quickly find points of interest.
Export Checkpoint Report
Click the [Export] button; users can choose to export the report in .csv or .pdf format. After setting the file name of the exported report, click [Save]. In addition, users can also save the report as a dvp file to record the inspected points and points to be inspected so that it is convenient to complete the taskmultiple times or to resume the work after accidentally exiting the program.
The label plays a crucial role in 3D GIS and is widely used in many industries and fields, such as emergency response, land surveying, planning, and design. Label technology provides users with an intuitive and accurate means of geographic information labeling through the form of points, lines, areas, and shorelines.
Users can select the label to edit, including moving the point labels' position and adding or deleting the nodes of line or surface labels. The optimized line and area labels display information more clearly, and the area labels show a semi-transparent effect (60% transparency) in the initial state, which makes the labels' information more coordinated with other geographic elements.
Supports showing and hiding label names, including single labels, all labels, and batch labels.
The label panel provides drag-and-drop, docking, resize, and collapse/expand functions, which makes it convenient for users to adjust the interface layout according to their needs.
A point label is used to annotate individual objects and can also be combined with line and area labels.
Users can use the [F1] shortcut to access the point label too quickly.
Point label attribute icons support six colors and 27 styles, and users can change the name and add rich description information according to their needs.
A line label usually takes the form of a folded line, which is used to express geographic elements such as roads, rivers, and so on.
Users can quickly use the line label tool by pressing the [F2] key.
Linelabel supports different color and transparency settings, and you can add names and descriptions. The line length measurements are below the property bar.
NGons label is used to express specific NGons, such as construction NGons, disaster NGons, etc.
Users can quickly use the face label tool by pressing the [F3] key.
Area labels also support color and transparency settings and can be given a name and description. Measurement results are below the property bar.
Importing and Exporting Annotation Files
Users can import kml or dvp files of points, lines, and surfaces by selecting [Annotation LayerβMore] and clicking [Import Annotation Files]. Both single file import and batch import are supported. After import, a new folder is created under the annotation information in the left panel.
Similarly, users can export annotation files by selecting [Labeling InformationβMore] and clicking [Exporting]. It supports .kml and .dvp export for points and lines, kml format export for surfaces, and .xml export for shorelines. Users can choose to export the whole annotation, a kml format export for surfaces, and a .xml export export for shorelines. Users can choose to export the entire annotation, single annotation, or multiple annotations at once, and the default export path is the last output directory.
Users can perform coordinate measurements by clicking any point on the model with the left mouse button.
Users can left-click multiple points on the model to draw folded line segments for distance measurement.
During the drawing process, the user can undo the previous operation by pressing the Backspace key.
The view shows the plotted trajectory as a "red" line and the total distance in real-time. At the same time, the "green dotted line" shows the horizontal distance between the start and end points (level distance), and the "blue dotted line" shows the difference in elevation between the two points (height difference).
If the model obscures the line segment, it is shown as a dotted line; the portion of the line of sight not obscured is shown as a solid line.
Users can draw polygons for area measurement by clicking points on the model surface with the left mouse button.
Double-clicking the left mouse button closes the polygon, and the drawing process can be undone by pressing the Backspace key.
After the drawing is finished, the system automatically calculates and displays the perimeter and area of the polygon, and the measurement result is saved to two decimal places.
Users can define the datum plane by clicking the points on the model surface and then double-clicking the closure to complete the drawing of the volume area.
The user can undo the operation using the [Backspace] shortcut during the drawing process.
The user can set the height of the datum and the sampling distance, and the system automatically calculates the volume according to these settings and displays the results of the perimeter, area, and fill and excavation analyses. Measurement results are retained to 2 decimal places.
The Excavation Measurement function is an advanced 3D GIS analysis tool that allows users to calculate the volumetric differences between selected ground surfaces and the model. This feature is of great practical value in civil engineering, terrain analysis, and urban planning.
Explanation of Earthwork Calculation Results
Excavation volume (mΒ³): This is the volume above the volumetric base portion, i.e., the portion to be excavated from the surface.
Fill volume (mΒ³): This is the volume below the volumetric foundation portion, i.e., the portion that needs to be filled to reach the foundation surface.
Volume difference (mΒ³): this is the difference between the volume of the excavation and the volume of the fill, indicating the change in the total volume.
Datum Plane Explanation
Highest Point Plane: The base plane is parallel to the XY plane and is at the highest height of all vertices. Recommended when calculating the fill volume of a sand pit, pool, pond, etc.
Lowest Point Plane: The foundation's surface is parallel to the XY plane, and the height is at the lowest vertices. This is recommended when part of the boundary is not visible, e.g., when walls partially surround the inventory.
Average Point Plane: The base surface is parallel to the XY plane and the average height of all vertices.
Center Point Plane: It connects the Highest and Lowest points, and the base surface is parallel to the XY plane; the High is the highest height of all vertices, and the Low is the lowest of all vertices.
Fit Plane: Fit the plane to the vertices so that all vertices are at the minimum distance from the base surface. This is recommended when the entire perimeter of the pile is visible, and the base surface is hard, sloped, or at a level of the same height.
Custom Surface: The base surface is parallel to the XY plane and has a custom height. This option is recommended when walls surround the inventory, and only part or none of the boundaries are visible, but the height of the flat base is known.
Draw the measurement area: Click the left mouse button to draw the polygon area to be measured. Each click creates a vertex, and a double click completes the polygon. When the drawing is complete, the user is presented with a base surface defined by the vertices.
Selecting the Datum Mode: Before performing earthwork calculations, the user can choose different modes. These modes include the Highest Point Plane, the Lowest Point Plane, the Average Point Plane, the Center Point Plane, the Fitting Plane, and the custom Plane. Each mode has its specific application scenarios and advantages.
Set Sampling Distance: The user can set the sampling distance as needed, which is an important parameter that affects the calculation's accuracy.
Start calculation: After setting the datum mode and sampling distance, users can click the [Calculation] button to get the earthwork calculation results. These results include excavation volume, fill volume, and volume difference.
Viewing and Copying ResultsOnce the calculation is complete, the user can view all the results on the Earthwork Calculation screen. If necessary, the user can also click the [Copy] button to copy the results, which is convenient for further data processing and analysis.
Users need to log in first.
