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1. Create a terrain model by different methods – By Graphical Filter By text interpolation By elements Aim: To Create a Terrain model by different methods Introduction: Digital Terrain Models (DTM) sometimes called Digital Elevation Models (DEM) is a topographic model of the bare Earth that can be manipulated…
RAHUL REDDY KANALA
updated on 12 Feb 2022
1. Create a terrain model by different methods –
Aim: To Create a Terrain model by different methods
Introduction:
Digital Terrain Models (DTM) sometimes called Digital Elevation Models (DEM) is a topographic model of the bare Earth that can be manipulated by computer programs. The data files contain the elevation data of the terrain in a digital format which relates to a rectangular grid. Vegetation, buildings, and other cultural features are removed digitally - leaving just the underlying terrain.DTMs are used especially in civil engineering, geodesy & surveying, geophysics, geography, and remote sensing.
In OpenRoads, a Terrain Model is created to represent the existing surface. If the source MX Triangulation is not a continuous surface and voids exist between groups of associated triangles, then importing the triangles will yield an inaccurate Terrain model. Therefore, the Terrain must be generated from the original surveyed strings that reside in the MX TOPO model.
Procedure:
By Graphical Filter
Step 1: Opening File
Open a New file with a 3D seed file
Set name as Terrain by Graphical filter and click save to open file
Step 2: Attaching Survey data
In-Home tab click on Attach tools and click on references
Click on Attach and select '3D_Survey Graphics file
Set attachment method as interactive
Click open and set the details as follows
Click ok and click fit view to view the file
Step 3: Using Graphical Filter
Go to the Terrain tab and click on From graphical filter
go to Graphical filter
By Text interpolation
Step 1: Opening File
Open a New file with a 3D seed file
Set name as Terrain by text interpolation and click save to open file
Step 2: Attaching Survey data
In-Home tab click on Attach tools and click on references
Click on Attach and select '3D_Survey Graphics file
Set attachment method as interactive
Click open and set the details as follows
Click ok and click fit view to view the file
Step 3: Creating terrain
Go to the Terrain tab and click on Terrain by Additional Method
In that click Create Terrain model by Text interpolation
From Elements
Step 1: Opening File
Open a New file with a 3D seed file
Set name as Terrain from elements and click save to open file
Step 2: Attaching Survey data
In-Home tab click on Attach tools and click on references
Click on Attach and select '3D_Survey Graphics file
Set attachment method as interactive
Click open and set the details as follows
Click ok and click fit view to view the file
Step 3: Terrain from elements
Click on Terrain From Elements
Go to the Home tab and click o Level display
Go to Element selection by layer and click on Line to select all spots
The resulting Triangles are as follows
Result:
The resulting Terrain models created are as follows
1. By Graphical Filter
2. By text interpolation
3. By elements
2. Edit the terrain model created
Aim: To Edit the TIN Network
Introduction:
Editing is terrain model is to remove the spots which are at unusual elevations which create unnecessary triangles and surfaces
Procedure:
Step 1: Open Terrain Model
Create a new dgn file using the '3D seed imperial' seed file
Set name as terrain editing
Open the Reference toolbar and attach the terrain from graphics elements created earlier
Click open and click fit view
Set overrides as yes
Step 2: Editing Terrain Model
Go to the Terrain tab click on edit terrain
Use various options and delete unwanted spots and triangle
1. Remove spot
Hover over the spot until a white spot is visible and click to delete
2. Delete Edge triangles
Hover over the unwanted edge triangle to delete them as follows
click to delete the triangle
3. Swap triangle side
Select the triangle side to swap
4. Add Vertex
Hover over the area where a new vertex is needed and select the spot
5. Move Vertex can be used to move the vertex
6. Delete triangle line is used to delete the unwanted lines of terrain created using a line drawn a specific direction
Result:
After removing all the unwanted spot and triangles the Terrain model is as follows
3. Annotate the contours with labels
Aim: To Annotate the contours with labels
Introduction:
Contours can be labeled along a given line in Open roads using " Labeling Terrain contours" in Terrain Tab
Procedure:
Step 1: Open Terrain Model
Open the edited terrain model created above
Step 2: Labeling Contours
Go to the terrain tab and click on Labeling terrain Contours
Set the following settings
Zoom in the terrain view and label the contour
Result:
The labeling of both major and minor contours is as follows
4. Change the contour interval.
Aim: To change the contour interval
Introduction:
Contour interval can be changed in properties tab
Procedure:
Step 1: Open Terrain Model
Open the edited terrain model created above
Step 2: Change Contour interval:
Click the terrain model and hover to view properties of the terrain
Result:
The resulting view of the terrain model before and after increasing contour intervals is
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Week 4 Challenge
1. Create a terrain model by different methods – By Graphical Filter By text interpolation By elements Aim: To Create a Terrain model by different methods Introduction: Digital Terrain Models (DTM) sometimes called Digital Elevation Models (DEM) is a topographic model of the bare Earth that can be manipulated…
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Week 3 Challenge
1. Create a terrain model by different methods – From file By ASCII By Graphical Filter By text interpolation By elements Aim: To Create a Terrain model by different methods Introduction: Digital Terrain Models (DTM) sometimes called Digital Elevation Models (DEM) is a topographic model of the bare Earth that…
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