Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
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Any referenced datasets can be downloaded from "Module downloads" in the module overview.
Transcript
00:01
INSTRUCTOR: Welcome to Creating Surfaces from Classified Point
00:03
Cloud Data.
00:05
This is the third and final objective
00:07
in the Creating Surfaces from Point Clouds in Civil 3D
00:11
course.
00:12
Classification uses filters to group point data
00:16
by specific feature, for example, Ground, Low and High
00:21
Vegetation, Buildings, and Water.
00:23
There's no standards for coding.
00:26
And you must obtain the class codes from the original data
00:29
provider.
00:30
Remember, classification is valuable
00:33
for topographic surface and feature extraction.
00:37
In our previous objective, we looked
00:39
at how non-classified point cloud
00:41
data is used to directly create a TIN surface.
00:45
In this objective, we will see how
00:47
a two-step process is used to create surfaces
00:50
using classified data.
00:54
Here's some points that are helpful to know about using
00:57
classified point data.
00:59
Using classification filters typically
01:02
gives us better surface results.
01:05
Recap does not display point cloud classification,
01:08
but it does pass the classification values
01:11
through to any output.
01:14
To filter points by classification in Civil 3D,
01:18
it requires some Map
01:22
and use of the Map task pane.
01:25
Here are two commands that you should know,
01:28
MAPCREATEPCSURFACE and the MAPWSPACE command.
01:34
Here's the workflow for using classified data.
01:38
After the point cloud is attached,
01:40
we check for the Classification.
01:42
If the data is classified, we use
01:45
the MAPCREATEPCSURFACE command to generate a TIFF file.
01:50
Then we use this TIFF file to create a DEM surface.
01:55
And if surface edits are required,
01:57
we use this same TIFF file to create a TIN surface.
02:03
To demonstrate the workflow, we will continue with the example
02:06
that we had from the previous objective.
02:10
Let's return to the Classification panel
02:13
and turn on the Ground classification.
02:23
Now we'll use the two-step method
02:25
that will respect the classified data.
02:27
Beginning with the special MAPCREATEPCSURFACE command,
02:32
the dialog box is launched.
02:35
And we can select to open up the classification filtering.
02:39
Only highlight the Ground category.
02:43
Next, set a file name and a destination
02:46
and then begin the processing.
02:51
And when finished, the raster data displays.
02:56
Changing the visual display style to 2D
02:58
Wireframe will turn the raster TIFF file
03:02
into the familiar green shade.
03:05
Use the Create Surface from DEM and browse
03:08
to the just made GeoTIFF file from the previous step.
03:12
The surface is built.
03:13
And next, we'll look at the surface statistics.
03:23
Notice that the data was filtered
03:25
and that only 2.4 million of the
03:32
We can remove the GeoTIFF from our project display
03:35
by opening the Map task pane and unchecking the feature.
03:42
You can also remove it by using the Remove Layer.
03:46
Note that this layer is not the same thing as a common CAD
03:49
layer.
03:51
The surface will have to maintain
03:53
a reference to the GeoTIFF file, so you need to keep it.
03:56
What we've done here is just remove the display
03:59
and the mapping layer.
04:01
With the TIFF removed, we can see the two surfaces
04:04
represented by the contours.
04:06
Let's use a quick section to view
04:08
the difference between the two surfaces we just created.
04:12
After setting up two view ports, we will make a quick section
04:16
from selecting on the line.
04:17
The blue line represents the surface
04:20
that we created in the previous objective.
04:22
This surface used all of the point cloud points.
04:26
The red surface is the surface we just generated
04:29
from the filtered data.
04:33
We could see in the resulting profile view
04:36
that the blue surface showing all of the point cloud,
04:39
and the surface is very irregular
04:41
with obvious buildings and low vegetation.
04:44
The red surface is a bit smoother
04:47
but does show some discrepancy around the buildings.
04:49
Another way to see the results is
04:51
to use the Object Viewer or any 3D view.
04:55
Using these tools, you can determine if the point cloud
04:58
data has created a good representation of the site
05:01
existing ground topography.
05:05
Remember, there are two good methods for building surface
05:07
objects in Civil 3D and which method you use
05:11
depends on the point cloud data and its characteristics.
05:15
This concludes the final objective
05:18
in the course Creating Surfaces from Point Clouds in Civil 3D.
Video transcript
00:01
INSTRUCTOR: Welcome to Creating Surfaces from Classified Point
00:03
Cloud Data.
00:05
This is the third and final objective
00:07
in the Creating Surfaces from Point Clouds in Civil 3D
00:11
course.
00:12
Classification uses filters to group point data
00:16
by specific feature, for example, Ground, Low and High
00:21
Vegetation, Buildings, and Water.
00:23
There's no standards for coding.
00:26
And you must obtain the class codes from the original data
00:29
provider.
00:30
Remember, classification is valuable
00:33
for topographic surface and feature extraction.
00:37
In our previous objective, we looked
00:39
at how non-classified point cloud
00:41
data is used to directly create a TIN surface.
00:45
In this objective, we will see how
00:47
a two-step process is used to create surfaces
00:50
using classified data.
00:54
Here's some points that are helpful to know about using
00:57
classified point data.
00:59
Using classification filters typically
01:02
gives us better surface results.
01:05
Recap does not display point cloud classification,
01:08
but it does pass the classification values
01:11
through to any output.
01:14
To filter points by classification in Civil 3D,
01:18
it requires some Map
01:22
and use of the Map task pane.
01:25
Here are two commands that you should know,
01:28
MAPCREATEPCSURFACE and the MAPWSPACE command.
01:34
Here's the workflow for using classified data.
01:38
After the point cloud is attached,
01:40
we check for the Classification.
01:42
If the data is classified, we use
01:45
the MAPCREATEPCSURFACE command to generate a TIFF file.
01:50
Then we use this TIFF file to create a DEM surface.
01:55
And if surface edits are required,
01:57
we use this same TIFF file to create a TIN surface.
02:03
To demonstrate the workflow, we will continue with the example
02:06
that we had from the previous objective.
02:10
Let's return to the Classification panel
02:13
and turn on the Ground classification.
02:23
Now we'll use the two-step method
02:25
that will respect the classified data.
02:27
Beginning with the special MAPCREATEPCSURFACE command,
02:32
the dialog box is launched.
02:35
And we can select to open up the classification filtering.
02:39
Only highlight the Ground category.
02:43
Next, set a file name and a destination
02:46
and then begin the processing.
02:51
And when finished, the raster data displays.
02:56
Changing the visual display style to 2D
02:58
Wireframe will turn the raster TIFF file
03:02
into the familiar green shade.
03:05
Use the Create Surface from DEM and browse
03:08
to the just made GeoTIFF file from the previous step.
03:12
The surface is built.
03:13
And next, we'll look at the surface statistics.
03:23
Notice that the data was filtered
03:25
and that only 2.4 million of the
03:32
We can remove the GeoTIFF from our project display
03:35
by opening the Map task pane and unchecking the feature.
03:42
You can also remove it by using the Remove Layer.
03:46
Note that this layer is not the same thing as a common CAD
03:49
layer.
03:51
The surface will have to maintain
03:53
a reference to the GeoTIFF file, so you need to keep it.
03:56
What we've done here is just remove the display
03:59
and the mapping layer.
04:01
With the TIFF removed, we can see the two surfaces
04:04
represented by the contours.
04:06
Let's use a quick section to view
04:08
the difference between the two surfaces we just created.
04:12
After setting up two view ports, we will make a quick section
04:16
from selecting on the line.
04:17
The blue line represents the surface
04:20
that we created in the previous objective.
04:22
This surface used all of the point cloud points.
04:26
The red surface is the surface we just generated
04:29
from the filtered data.
04:33
We could see in the resulting profile view
04:36
that the blue surface showing all of the point cloud,
04:39
and the surface is very irregular
04:41
with obvious buildings and low vegetation.
04:44
The red surface is a bit smoother
04:47
but does show some discrepancy around the buildings.
04:49
Another way to see the results is
04:51
to use the Object Viewer or any 3D view.
04:55
Using these tools, you can determine if the point cloud
04:58
data has created a good representation of the site
05:01
existing ground topography.
05:05
Remember, there are two good methods for building surface
05:07
objects in Civil 3D and which method you use
05:11
depends on the point cloud data and its characteristics.
05:15
This concludes the final objective
05:18
in the course Creating Surfaces from Point Clouds in Civil 3D.
This method uses filtered point cloud data. It will use filters by classification.
Note: the raster file can be disconnected from this drawing, however the file cannot be deleted as it is a data source that is being referenced to build the surface that appears in this drawing and must remain linked to the surface.
It is not necessary to save this drawing.
There are several ways to create existing ground terrain. It is important to review the resulting data and methods to determine which surface method is best for the original data that you are using. Depending on the data, the methods, and the manual clean-up your model can represent the existing conditions.
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