Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
Professional CAD/CAM tools built on Inventor and AutoCAD
Transcript
00:05
After completing this lesson, you will be able to understand project and shared coordinates, and acquire coordinates.
00:12
The objective domains covered are, 5.4b, understand the concept of shared coordinates.
00:21
Coordination between real world coordinates and your Revit projects requires special attention.
00:26
Getting this information wrong can be very costly and lengthen the project delivery times.
00:32
In order to fully understand this subject, we must first understand each datum in Revit and its purpose.
00:40
The project base point by default is positioned on top of the internal point and should remain clipped.
00:47
There is a geometry limit of 20 miles around the project base point.
00:53
The survey point should be placed at the origin of the coordinate system and remain at (0, 0, 0),
00:59
or placed at a local survey station with the associated coordinates.
01:04
The project base point should be located on a setting out point that can be clearly established out in site.
01:11
For example, this may be the intersection of two grids.
01:15
A site model is simply another Revit model that can contain one or more Revit models and other civil features, such as drainage and topography.
01:24
The structural model is linked into the coordinated site model, and the coordinates are acquired and saved into your model.
01:31
A link has now been established between the two Revit models.
01:37
Go ahead and open up the file 004-Uncoordinated model.
01:43
The model should open up in the site plan.
01:47
Here we have a structural layout that's modeled from Revit's internal origin point.
01:53
The internal origin point and the project base point will share the same location, which is the datum of Revit.
01:60
It should have the coordinates by default of zero for the north, zero for the east, zero for the elevation, and zero for angle to true north.
02:11
Our structural model has been located at our grid setting out point, grids A-1.
02:17
At this particular point, we may not have any survey information to base the levels and position on,
02:22
so we've established here that we're going to use a local setting out point, which is grid A1.
02:27
And we're going to assume that the ground floor is, in fact, modeled at 0 feet.
02:32
So if we open up the south elevation, you can see also the ground floor is situated at 0 feet.
02:41
So our next task is to coordinate this model.
02:45
In order to do this, we're going to need to link it into our site model.
02:48
So this model will need to be closed down, so click File and then close.
02:56
You then go ahead and open up the file 004-Understand the concept of shared coordinates.
03:05
Our model opens up in the site plan.
03:09
Before we start, let's review some of the documents that are linked into this model.
03:16
Let's start with the AutoCAD drawing. So this AutoCAD drawing has come from the surveyor.
03:21
It's been drawn in its real world position and rotated to its real world position, so the surveyor has prepared all of this information.
03:28
You'll also note that the local setting out point has been marked on the survey.
03:34
That information has been transferred across to our project base point.
03:39
In this example, it was manually typed in, but you could also acquire the coordinates from the CAD model.
03:47
The survey point has been positioned in this case to a known survey station with the correct coordinates.
03:56
We also have a Revit toposurface included in the project, the toposurface has come from Civil 3D.
04:03
So our next task here is to link in our structural project.
04:09
On the Insert ribbon, select Link Revit.
04:14
In the Import Link Revit dialog box, let's go ahead here and select 004-Uncoordinated model.
04:21
Do make sure that the positioning is set to Auto-Origin to Origin.
04:25
This will ensure that the two models are positioned on the internal origin.
04:31
Let's go ahead and open that.
04:36
So the only task for us to do now is to take our Revit model and rotate it to match the survey.
04:42
To do this, let's select our linked Revit model.
04:47
On the ribbon, we'll go ahead and click the Rotate command.
04:52
Let's also make sure that we place the center of rotation at the base point.
04:57
To do this, we can click Place on the Options bar.
05:01
I'm going to zoom right away in, and then use the Tab key to make sure that I pick the point.
05:09
Note in the status bar in the bottom left hand corner of Revit, it now says Point of Site: Project Base Point.
05:16
I click here.
05:18
Then I need to define a position along grid A, so I'm going to pick a point over here somewhere.
05:24
This is just an arbitrary point, but it must be on the grid.
05:28
And to define a second point of rotation, we can pick the pink line representing grid A, so that's this pink line along here.
05:36
And again, I can pick any arbitrary point along that, as long as it's on that line.
05:43
Our Revit model is now positioned, however, we still need to make sure that this has its correct elevation or Z height.
05:53
To do this, we have a section here cut through the project base point, called structural pad.
05:58
Let's go ahead and open that section up.
06:03
So here's our linked Revit model.
06:07
This model now simply needs to be moved from the top of concrete here to the pad level.
06:14
To do this, we can select the Move command.
06:18
We can pick on the top of concrete.
06:22
Note that the Constrain option is switched on, on the Options bar.
06:28
And what we'll then do is snap to the pad.
06:33
In the Project browser, let's open up the 3D view.
06:37
And you can now note that our model is now coordinated and sitting at the correct level on our toposurface.
06:48
So we're now going to go ahead and share the coordinates.
06:54
Select your Revit model, and in the Properties palette, you'll notice here we have shared site. Currently it's not shared.
07:04
What we want to do is record the current position.
07:06
If I click on "Change", if I had different positions set up in the uncoordinated model, I could select those, but in this case this is Building A.
07:15
If I click "OK" and "OK" again, I'll now need to save the model.
07:21
Notice now I have the Location Position Change dialog box.
07:25
This is just recognizing that the shared coordinate system has been established,
07:29
and now we're going to write some information back to the 004-Uncoordinated model.
07:35
Let's go ahead and click "Save", and the model is now saved.
07:41
To have a look at the results, we'll now close down our site file.
07:47
And we'll now go back and open up the Uncoordinated model.
07:52
So the first thing we'll note is in the site plan, you can see now that our models are quite a long way apart.
07:59
Let's open up the ground floor plan.
08:02
And we can see here that there doesn't seem to be any rotation.
08:06
However, in the properties of the view here, you'll notice that the orientation is currently set to project north.
08:13
Let's set this to true north.
08:15
And you can now see the rotation matches the survey.
08:21
If I place a spot coordinate down to confirm the location, on the Annotate ribbon, I can select Spot Coordinate.
08:31
And you'll now notice that the coordinates match.
08:36
Lastly, if I open up the South elevation, and we review our levels, you'll note here that the ground floor level doesn't appear to have changed.
08:47
However, if we select the level in the Properties palette, select Edit Type, we can change the type properties here of the elevation base.
08:59
You'll notice that the elevation base is set to the Project Base Point.
09:03
Let's go ahead there and change that to the Survey Point.
09:07
Click "OK" to the Type Properties and all of our levels update.
09:12
Okay, so that confirms that our model is now coordinated.
Video transcript
00:05
After completing this lesson, you will be able to understand project and shared coordinates, and acquire coordinates.
00:12
The objective domains covered are, 5.4b, understand the concept of shared coordinates.
00:21
Coordination between real world coordinates and your Revit projects requires special attention.
00:26
Getting this information wrong can be very costly and lengthen the project delivery times.
00:32
In order to fully understand this subject, we must first understand each datum in Revit and its purpose.
00:40
The project base point by default is positioned on top of the internal point and should remain clipped.
00:47
There is a geometry limit of 20 miles around the project base point.
00:53
The survey point should be placed at the origin of the coordinate system and remain at (0, 0, 0),
00:59
or placed at a local survey station with the associated coordinates.
01:04
The project base point should be located on a setting out point that can be clearly established out in site.
01:11
For example, this may be the intersection of two grids.
01:15
A site model is simply another Revit model that can contain one or more Revit models and other civil features, such as drainage and topography.
01:24
The structural model is linked into the coordinated site model, and the coordinates are acquired and saved into your model.
01:31
A link has now been established between the two Revit models.
01:37
Go ahead and open up the file 004-Uncoordinated model.
01:43
The model should open up in the site plan.
01:47
Here we have a structural layout that's modeled from Revit's internal origin point.
01:53
The internal origin point and the project base point will share the same location, which is the datum of Revit.
01:60
It should have the coordinates by default of zero for the north, zero for the east, zero for the elevation, and zero for angle to true north.
02:11
Our structural model has been located at our grid setting out point, grids A-1.
02:17
At this particular point, we may not have any survey information to base the levels and position on,
02:22
so we've established here that we're going to use a local setting out point, which is grid A1.
02:27
And we're going to assume that the ground floor is, in fact, modeled at 0 feet.
02:32
So if we open up the south elevation, you can see also the ground floor is situated at 0 feet.
02:41
So our next task is to coordinate this model.
02:45
In order to do this, we're going to need to link it into our site model.
02:48
So this model will need to be closed down, so click File and then close.
02:56
You then go ahead and open up the file 004-Understand the concept of shared coordinates.
03:05
Our model opens up in the site plan.
03:09
Before we start, let's review some of the documents that are linked into this model.
03:16
Let's start with the AutoCAD drawing. So this AutoCAD drawing has come from the surveyor.
03:21
It's been drawn in its real world position and rotated to its real world position, so the surveyor has prepared all of this information.
03:28
You'll also note that the local setting out point has been marked on the survey.
03:34
That information has been transferred across to our project base point.
03:39
In this example, it was manually typed in, but you could also acquire the coordinates from the CAD model.
03:47
The survey point has been positioned in this case to a known survey station with the correct coordinates.
03:56
We also have a Revit toposurface included in the project, the toposurface has come from Civil 3D.
04:03
So our next task here is to link in our structural project.
04:09
On the Insert ribbon, select Link Revit.
04:14
In the Import Link Revit dialog box, let's go ahead here and select 004-Uncoordinated model.
04:21
Do make sure that the positioning is set to Auto-Origin to Origin.
04:25
This will ensure that the two models are positioned on the internal origin.
04:31
Let's go ahead and open that.
04:36
So the only task for us to do now is to take our Revit model and rotate it to match the survey.
04:42
To do this, let's select our linked Revit model.
04:47
On the ribbon, we'll go ahead and click the Rotate command.
04:52
Let's also make sure that we place the center of rotation at the base point.
04:57
To do this, we can click Place on the Options bar.
05:01
I'm going to zoom right away in, and then use the Tab key to make sure that I pick the point.
05:09
Note in the status bar in the bottom left hand corner of Revit, it now says Point of Site: Project Base Point.
05:16
I click here.
05:18
Then I need to define a position along grid A, so I'm going to pick a point over here somewhere.
05:24
This is just an arbitrary point, but it must be on the grid.
05:28
And to define a second point of rotation, we can pick the pink line representing grid A, so that's this pink line along here.
05:36
And again, I can pick any arbitrary point along that, as long as it's on that line.
05:43
Our Revit model is now positioned, however, we still need to make sure that this has its correct elevation or Z height.
05:53
To do this, we have a section here cut through the project base point, called structural pad.
05:58
Let's go ahead and open that section up.
06:03
So here's our linked Revit model.
06:07
This model now simply needs to be moved from the top of concrete here to the pad level.
06:14
To do this, we can select the Move command.
06:18
We can pick on the top of concrete.
06:22
Note that the Constrain option is switched on, on the Options bar.
06:28
And what we'll then do is snap to the pad.
06:33
In the Project browser, let's open up the 3D view.
06:37
And you can now note that our model is now coordinated and sitting at the correct level on our toposurface.
06:48
So we're now going to go ahead and share the coordinates.
06:54
Select your Revit model, and in the Properties palette, you'll notice here we have shared site. Currently it's not shared.
07:04
What we want to do is record the current position.
07:06
If I click on "Change", if I had different positions set up in the uncoordinated model, I could select those, but in this case this is Building A.
07:15
If I click "OK" and "OK" again, I'll now need to save the model.
07:21
Notice now I have the Location Position Change dialog box.
07:25
This is just recognizing that the shared coordinate system has been established,
07:29
and now we're going to write some information back to the 004-Uncoordinated model.
07:35
Let's go ahead and click "Save", and the model is now saved.
07:41
To have a look at the results, we'll now close down our site file.
07:47
And we'll now go back and open up the Uncoordinated model.
07:52
So the first thing we'll note is in the site plan, you can see now that our models are quite a long way apart.
07:59
Let's open up the ground floor plan.
08:02
And we can see here that there doesn't seem to be any rotation.
08:06
However, in the properties of the view here, you'll notice that the orientation is currently set to project north.
08:13
Let's set this to true north.
08:15
And you can now see the rotation matches the survey.
08:21
If I place a spot coordinate down to confirm the location, on the Annotate ribbon, I can select Spot Coordinate.
08:31
And you'll now notice that the coordinates match.
08:36
Lastly, if I open up the South elevation, and we review our levels, you'll note here that the ground floor level doesn't appear to have changed.
08:47
However, if we select the level in the Properties palette, select Edit Type, we can change the type properties here of the elevation base.
08:59
You'll notice that the elevation base is set to the Project Base Point.
09:03
Let's go ahead there and change that to the Survey Point.
09:07
Click "OK" to the Type Properties and all of our levels update.
09:12
Okay, so that confirms that our model is now coordinated.
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