The base points (control points) allow you to use a coordinate system based on the civil origin or other coordinate system for interoperability and collaboration. For example, you can use base points when inserting reference models, exporting IFC models, in drawings, in Layout manager, and in reports and templates.
Civil origin is the datum point or fundamental benchmark point of the national land survey network.
When you use base points, you can keep the coordinates small and locate the model wherever needed. You can create as many base points as you need, and select one of those to be the project base point.
Note the following:
- Reference model should not have any additional lines to the origin.
- Reference models should not include objects that are very far from each other because otherwise using the model may get difficult.
- Tekla Structures native objects including reference models should not be inserted very far from the Tekla Structures model origin.
Define a base point
- Open a Tekla Structures.
- Click Base point dialog box. to open the
Fill in the needed information:
Name, Description Enter a name and a description for the base point. Coordinate System Enter the name of the coordinate system you are using. East coordinate (E) Enter the East coordinate (E) that represents the X coordinate related to the civil origin. North coordinate (N) Enter the North coordinate (N) that represents the Y coordinate related to the civil origin. Elevation Enter the Elevationthat represents the Z coordinate related to the civil origin. Latitude,Longitude
Enter the Latitude and Longitude of the base point to be used in the IFC export.
Latitude and Longitude is additional information, which some software can use. In the IFC file, this is written to
If the total number of digits in Longitude is more than 15, the value is rounded up to the nearest if it is > 99.999999999999999999.
To convert Latitude and Longitude information between decimal format and degree/minute/second (DMS) format, see Convert Latitude/Longitude to decimal.
Location in the model
Pick or enter a location for the base point in the Tekla Structures model. The distance is measured from the model origin.
The base point location in the model can have a maximum value of +/- 10 km from the model origin. Modeling is meant to be done near the model origin, and the offset is to be given with East coordinate and North coordinate values.
Angle to North Pick or enter the Angle to North, which is the angle between Y and North directions. The maximum number of decimals for the angle is 13. Project base point If you want to set a coordinate system as the project base point, select a base point from the list at the top and then select the Project base point check box.
Modify to save the base point.
A blue symbol is added in the model.
If you later on make changes to the base point, the base point location in the model changes according to the location or rotation changes you make in the Base point dialog box when you press Enter or click another input field, and there is no need to click Modify.
Now you can insert a reference model, or export an IFC model using the defined base point.
Set a coordinate system as the project base point
One base point can be set to be as the project base point. Model origin is the default project base point value if the model does not contain any base points, or if none of the existing base points has been set to be the project base point. You can check and change the current project base point through.
Note that it is not recommended to change the project base point temporarily during a project.
You can see the current project base point in the Location by box.
- To change the project base point, click Edit, and select a new project base point from the Location by list.
- Click Apply.
Insert a reference model using a base point
Before you can insert a reference at the base points, you need to create a base point in your model. To create the base point, you need to know the coordinates of the reference model that you are importing.
- Open the Reference Models list by clicking the Reference Models button in the side pane .
- In the Reference Models list, click the Add model button.
- In the Add model dialog box, if you have any previously created reference model properties files, load the desired file by selecting the file from the properties file list at the top.
- Browse for the reference model by clicking Browse....
Group, select a group for the reference model, or enter a name for a new group.
If you do not enter a name for the group, the reference model is inserted in the Default group.
Location by, select the base point you want to use.
Add model button.
Tekla Structures inserts the reference model relative to the selected base point by using the coordinate system values, elevation and angle in the base point definition in the model Project properties.
Export an IFC model using a base point
Before you can export an IFC file using a base point, you need to create a base point in your model.
- Click Export to IFC dialog box. to open the
- In Location by, select a base point that you have created.
- Fill in other necessary IFC export information.
The base point option exports the IFC model relative to the base point using the coordinate system values, elevation, latitude, longitude and angle in the base point definition in the model Project properties.
Base points in drawings
It is possible to use base-point-defined coordinate system values in drawings. If you change the project base point Z or the elevation value, the level value will change accordingly when a drawing is opened.
- Base point data can be used in drawing and view level to set the coordinate system. The base point can be used instead of datum offset.
- When the base point is set, level attributes and template attributes in marks provide values in the specific base-point-defined coordinate system.
- This setting affects level marks and attributes that end with
- When the base point is set at the drawing level, the
_BASEPOINTtemplate attributes can be used in drawing templates.
You can set Location by in drawing view properties to use model origin, project base point or any base point defined coordinate system. Location by uses the project base point as the default value.
The datum level only affects the attributes
Location by is set to
Model origin or to the project base point that is in the model origin.
To change the Location by value:
- In an open drawing, double-click the drawing view frame to open the View Properties dialog box.
- On the Attributes 2 tab, set Location by to a new base point, or to the model origin.
Example of base point usage in a drawing
In the following example, do the following:
Create a slab with a thickness of 200 mm with the slab's top at the level 0 in the model.
Create a new base point "Control point 1" with elevation 20000 mm.
Create a GA drawing in plan view.
Open the GA drawing, double-click the view frame to open the View properties dialog box.
On the Attributes 2 tab, you set Location by to the new base point (Project base point) "Base point 2" and click Modify.
Add a level mark using the following template attributes:
Reopen the drawing.
Note that changing the value does not update the template attribute automatically but after reopening the drawing.
Base points in Layout manager
You can use base points in Layout manager when defining the location of layout points.
Base point in reports and templates
You can inquire project base point and current base point value in reports and templates.
The following table lists the template attributes where you can use
_BASEPOINT at the end, for example,
ASSEMBLY_BOTTOM_LEVEL_BASEPOINT. Note that
_BASEPOINT uses the current base point in the same way as the workplane uses the current workplane. If there is no current base point defined,
_BASEPOINT provides values relative to model origin (Global).