Processing of project from TcpGPS in TcpMDT

This tutorial shows how to create a digital terrain model (DTM), contour lines and profiles in TcpMDT using a topographic survey imported from TcpGPS.

Summary

TcpMDT by Aplitop is a land surveying software that runs on AutoCAD®, BricsCAD®, GstarCAD®, or ZWCAD® and provides tools for creating digital terrain models, profiles, volume calculations, roads, etc.

To integrate Emlid Flow data with the Aplitop TcpMDT application, you'll need the following:

TcpGPS for Android 2.7+
AutoCAD® v2007+, BricsCAD® Pro v16+, GStarCAD® Professional v2021+, or ZWCAD® Professional v2012+
TcpMDT Standard v9.0+

tip

Check the data collection procedure in the Integration of Reach RS2/RS2+ with Aplitop TcpGPS for Android guide.

Workflow

Below is one of the possible workflows, which consists of drawing the survey points, creating the digital terrain model, generating the contour lines, creating an alignment and obtaining long and cross sections.

Importing points

Start TcpMDT.
Run MDT9 > Points > Import.
Select format Generic and choose NXYZ.
Choose a suitable scale for the representation of the texts and uncheck the Draw from Codes option.
Click OK and choose the PUN file previously exported from TcpGPS in MDT format.
The points will be drawn with their numbering and elevations.
Run MDT9 > Points > List and verify that the points in the file have been imported.
Press the All button and check that the point codes have been converted correctly. The ones with point geometry, e.g., TREE, appear as is, and the ones with the linear geometry are completed with the suffixes "S" for start and "E" for end.

Drawing break lines and blocks (Optional)

TcpMDT can generate the digital terrain model more accurately by drawing changes in the terrain slope, known as break lines. These can be drawn as polylines on different layers with CAD tools, or automatically generated if the points have been coded on the site. Blocks can also be automatically inserted from the codes, e.g. trees, manholes, posts, street furniture, etc.

Run MDT9 > Points > Codes > Code Database.
Select the item from the list to be modified and click the Edit button. The figure shows the LS code (Low Slope) which is of line type and will be drawn on the layer LOW_SLOPE in magenta color.
Press OK twice.
Run MDT9 > Points > Codes > Draw from Codes.
Keep the default options and click OK.

Creating digital terrain model

Run MDT9 > Surfaces > Create Surface and accept the proposed file name.
In the dialog, check that within the Elements to Triangulate there are the Points and Break Lines elements. Tap the Layers button.
Choose the list of layers that should be considered as break lines, drawn automatically or manually, using the > button, and press OK.
Click OK again to generate and draw the triangulation.

Generating contour lines

Run the command MDT9 > Contour Lines/Mapping > Create Contour Lines.
Setting the intervals between minor and major contour lines.
Click OK to generate the contour lines.

Creating alignment

Run the Draw > Polyline CAD command and draw an alignment that we'll use to create profiles.
Run MDT9 > Horizontal Alignments > Convert Polyline to Alignment and select the previous polyline.
Enable the Annotate Alignment option and click OK two times.

Creating profiles

Run MDT9 > Long Sections > Create Long Section, and select the alignment created in the previous step.
In the dialog, leave all options by default and press OK.
Choose the appropriate values for horizontal and vertical scale. In the Vertices to Represent frame, choose Constant and set an interval.
Click OK to draw the longitudinal profile in model space and choose an insertion point in a clear area of model space.
Run MDT9 > Cross Sections > Create Cross Sections, and select the alignment again.
In the dialog, set the left and right profile lengths and the interval between sections and press OK.
In the dialog, choose Paper Space and set horizontal scale, vertical scale, and paper size.
Click OK to proceed with the drawing.