Transcript
00:03
after you import a surface into your model.
00:06
There may be areas of the surface that you do not need or that appear to have errors.
00:11
You can trim the surface model so that you focus on only the area you want to work with
00:17
zoom into the west side of the imported surface model
00:21
here you can see some colors that appear incorrect
00:24
in comparison to the surface indicated around it.
00:28
This is most likely an indication of an error in the data source
00:32
such as an incorrect level or elevation of -999 or a point is missing.
00:40
To correct this in the thematic map you can delete that area,
00:45
zoom back out or select view extents
00:49
in the tree view, right click the surface node and select edit data
00:54
in the surface data dialog box.
00:56
There is an option to trim surface
00:60
be aware however that before you perform a trim surface operation,
01:04
make sure that all the data has indeed been loaded into the model,
01:08
especially for very large data sets,
01:12
ensure that you have loaded all A. S. C. Tiles as they make up a large area.
01:18
It can be common that your side is located at the junction
01:21
of four tiles and you need the area in the middle.
01:25
So best practice is to load all the tiles initially and then pair it
01:30
down so that you are focusing on only the area that you want.
01:35
Then you can save that as an info drainage file so that it is formatted correctly.
01:40
When you bring it in again,
01:42
click trim to define a trim surface,
01:45
the trim surface dialog appears.
01:47
This matches the imported surface data where each
01:50
circle represents a point in the data table.
01:54
It is important to remember that when you are defining the trim surface,
01:58
you are indicating the surface you want to keep not the piece you want to discard,
02:04
ensure that the select arrow is highlighted.
02:06
And in the window
02:07
notice that the cursor has turned into a circle with crosshairs,
02:12
place it in the upper left corner and then click and drag toward the lower right
02:17
so that most of the surface is selected
02:19
except for the areas on the left where the missing data was.
02:24
Then click OK.
02:26
The surface data dialog appears
02:28
and you may be prompted to either create
02:31
a new file or overwrite the existing surface,
02:35
click override existing
02:37
in the plan view, you can see the model update,
02:41
save the file,
02:43
click file to see the file saving options
02:47
here.
02:47
You can save the current design as a new surface model or as a template
02:53
for this exercise, click save as navigate to the save work here folder,
02:59
name the file and click save
00:03
after you import a surface into your model.
00:06
There may be areas of the surface that you do not need or that appear to have errors.
00:11
You can trim the surface model so that you focus on only the area you want to work with
00:17
zoom into the west side of the imported surface model
00:21
here you can see some colors that appear incorrect
00:24
in comparison to the surface indicated around it.
00:28
This is most likely an indication of an error in the data source
00:32
such as an incorrect level or elevation of -999 or a point is missing.
00:40
To correct this in the thematic map you can delete that area,
00:45
zoom back out or select view extents
00:49
in the tree view, right click the surface node and select edit data
00:54
in the surface data dialog box.
00:56
There is an option to trim surface
00:60
be aware however that before you perform a trim surface operation,
01:04
make sure that all the data has indeed been loaded into the model,
01:08
especially for very large data sets,
01:12
ensure that you have loaded all A. S. C. Tiles as they make up a large area.
01:18
It can be common that your side is located at the junction
01:21
of four tiles and you need the area in the middle.
01:25
So best practice is to load all the tiles initially and then pair it
01:30
down so that you are focusing on only the area that you want.
01:35
Then you can save that as an info drainage file so that it is formatted correctly.
01:40
When you bring it in again,
01:42
click trim to define a trim surface,
01:45
the trim surface dialog appears.
01:47
This matches the imported surface data where each
01:50
circle represents a point in the data table.
01:54
It is important to remember that when you are defining the trim surface,
01:58
you are indicating the surface you want to keep not the piece you want to discard,
02:04
ensure that the select arrow is highlighted.
02:06
And in the window
02:07
notice that the cursor has turned into a circle with crosshairs,
02:12
place it in the upper left corner and then click and drag toward the lower right
02:17
so that most of the surface is selected
02:19
except for the areas on the left where the missing data was.
02:24
Then click OK.
02:26
The surface data dialog appears
02:28
and you may be prompted to either create
02:31
a new file or overwrite the existing surface,
02:35
click override existing
02:37
in the plan view, you can see the model update,
02:41
save the file,
02:43
click file to see the file saving options
02:47
here.
02:47
You can save the current design as a new surface model or as a template
02:53
for this exercise, click save as navigate to the save work here folder,
02:59
name the file and click save
After you import a surface into your model, there may be areas of the surface that you do not need, or that appear to have errors. You can trim the surface model so that you focus on only the area you want to work with.
Optionally, ensure that all ASC tiles are loaded, as they make up a large area. A site may be located at the junction of four tiles. Best practice is to load all the tiles, then pare it down so that you are focusing on only the area that you want. Save the pared-down area of ASC tiles as an InfoDrainage file. Then, import the new .iddx file.
IMPORTANT: When defining the trim surface, indicate the surface you want to keep, not the piece you want to discard.
