Tạo đường đồng mức cho đường

1. Tạo đường alignment.

có 2 cách tạo đường alignment là tạo từ đường polyline có sẵn hoặc tạo từ layout.Thông thường hay tạo bằng đường polyline hơn.

Sau khi tạo đường alignment tiếp đến là khai báo về kiểu, nhãn, và vận tốc.

2. Tạo một mặt cắt dọc.
từ menu profiles chọn tạo mới một mặt cắt dọc.

Trên bảng trắc dọc tự nhiên vừa tạo, vẽ lên đường trắc dọc thiết kế bằng cách vẽ từ layout trong menu profiles

3. Tạo mắt cắt đường.
Từ menu corridor chọn subassembly tool palettes chọn một mặt cắt đường đã được thể hiện trước trong thẻ assemblies imperial.

4. Tạo tuyến đường có bề rộng từ menu corridors
Sau đó click chuột phải lần lượt chọn các yếu tố mà ta vừa chọn.




Tạo được tuyến đương như sau.


5. Tạo đường đồng mức.

chọn corridor property


chọn surface style sau đó display đường đồng mức lên sau đó chỉnh khoảng cách của các đường đồng mức trong thẻ contours
kết quả

Using AECPolygon to Hide Surface Contours

I've been looking on the many hidden commands that are included in the program, but are undocumented. One of them is AECPolygon. One of the uses I thought of would be to hide surface contours with out having to select each polyline, like you would have to do with the boundary hide command. Learn more after the annoying jump...

You can use existing polylines or create the AECPOLYGON the same way you would draw a regular polyline. In this example I will create the AECPOLYGON's from existing polylines. To start type AECPOLYGON into the command line. Select the Convert option and select the PLines option. Select the polygons that you want converted to mask the surface.
If you want to keep the source polylines then select No, otherwise choose Yes. Now you will want to change the style of the newly created AECPOLYGON to do this press S for Style. A style manager will pop up onto the screen. Right click on AEC Polygon Styles and Choose New.Provide a name for the style, I choose HideContour. Go to the other tab and select Use Background Mask and select OK at the bottom of the screen.

Press enter to get out of the command. When you get out of the command you should notice that the style was not applied to the AECPOLYGON's.

To get them to show the correct style, select the AECPOLYGONs and go to properties and change it to show the style you created.
Now when you will have the surface contours will be hidden by the AECPOLYGON.


Unlike the Surface Boundary Hide, you have to worry about draworder and you can't print them from model space without changing the color of the mask (if you do it will come out as a black box). As long as you want the surface printed first it should be pretty easy to manage; send any surfaces to the back in which you don't want the contours being masked, then send the AECPOLYGONs to the back and then the Surface to be masked to the background.

This may also seem like the same as the wipeout command but there are somethings I like which are better, for instance you can add and remove vertexes throught the right click menu and there is an extra grip between vertexes that allows you to drag the edges and they stay parallel to the original line. Give it a try you may like it or not.

Disclaimer: I haven't actually used this in production, but will probably do so in the future.

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Contours from a DEM file to a SHP file with MAP 3D

Do you need to create a ESRI shp file for contours lines from a DEM file? You can with Map 3D by using the civil tools.

This post will be a quick walk-thru on doing it with some screen shots to help you. To start bring in the DEM as a surface.
From the pull-down menu under “Civil-Surface-Create From DEM”

Browse to where the DEM file is located and select it. In a matter of seconds a new surface is created in MAP. Zoom extends and all you may see is a yellow rectangle. The reason you do not see anything is you may not have the styles for the surfaces set to display the objects(contours). The default display for civil surfaces in MAP is to show the border only for 2D display and triangles for 3D display. Open up the Civil Toolspace and click on the “Settings” tab. Expand the surface tree to show the Surface Style Standard. Right click on the standard style and click on edit.

The Style editor dialog will open, for that surface style. The first thing we need to tell MAP 3D is the contour intervals we want it to display. Click on the Contour tab at the top then expand the tree under Contour Intervals.

Set the Minor Interval to 25.00′ and the Major Interval to 150.00′. Keep the Base Elevation at 0.00′.
Next click on the Display tab so MAP 3D knows will know how we want them displayed.

In the View Direction select 3D. Set the Triangles as invisible and Major Contours & Minor Contours as Visible by clicking on the light bulb icon. Next put the contours on their own layers by clicking under the layer for each and select a layer or create a new layer for each. Next you can check that the same settings are there under the View Direction for 2D by switching the 3D to 2D in the View Direction list box. Click apply and OK.

Map takes a few minutes to create and display the contour lines. They should be at the intervals you set and displayed by the color specified in the style editor not by the layer color. Now that you have the contours displayed you may notice they are not polylines but a single object. A Civil object at that, so we need to convert them into polylines to export to a shp file.

To convert them the first thing I like to do is change my view of them to a 3D view. Using the standard AutoCAD view menu switch to a 3D view (SW Isometric). After MAP rescans the surface you should see that the contours are at the correct elevations. This is a good tip to verify that the DEM was converted to a surface and displays the contours as you wanted. Then next step is to Export the surface to a AutoCAD dwg.
Under the Civil menu, select Civil Utilities>Export to AutoCAD>2004 format.

Save the exported dwg to the folder of your choice. After the export is complete open the dwg that you just created. It should be in the same 3D view as the surface when you exported it, again this is a tip to check and see that you have what you need for the shp file. There is no need to change the view in the new dwg. If you select a contour line, you will notice it is a polyline on the layer you set in the style editor and at the correct elevation.

Now you have the correct objects to Export to a ESRI shp file. When you export it you can export the layer and elevations from the properties to include those in the shp file data.

As you can see the contours lines with the elevations and layers are there in a ESRI table so anyone can now use the DEM file as contours in their GIS system.

Note this example was done using Map 3D 2006, the civil tools in Map 3D 2007 are different but I ‘ll try to post the how-do with R2007 in a few weeks.

An another item to be aware of, when you set the value for the contour intervals keep in mind the smaller the intervals the more there are and the bigger the file becomes then the longer it takes to rescan and redraw the surface

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Contours from Shape Files with Elevations

Do you have a contour line file that is in ESRI shp format and need to create a from it or need the contour lines to be at their correct elevation? You can import it and create civil surfaceObject Data from the lines’ attributes then perform an alter-properties query to set the lines at their correct elevations.

Start by using the map import command to import the shp file, located on the Map menu Tools > Import. Browse to the shp file and select it. For those not familiar with the shape format there needs to be at least 3 files that make up the ESRI shape format. (shp, shx, & dbf) When using the map import you only will see the file with the shp extension.

After you select the file and click OK the Import dialog box displays allowing you some options to set for the import, like the coordinate system transformation or doing a spatial filter and a few more. The only one we need to set is the “Data”. We will convert the shape file attributes into object data.

In the column on the lower half of the dialog click on under the column labeled Data. Then click on the ellipse icon (the 3 dots). This will display the Attribute Data dialog. In this dialog we select “Create object Data” and use the default Object Data table name which is the name of the shape file. Note: Map 3D 20008 versions prefixed with the word “Default” you can rename it if you desire.

You can click on the “Select Fields..” button and see what attributes will be converted and what Map 3D will name the Object Data (OD) fields. This is a good step to ensure there is a field that contains the elevation and it gets converted to the OD. After you view the fields/attributes select OK and OK in the Attribute Data dialog. Select OK in the Import Dialog and wait for the import to happen, the command line will let you know that X number of objects imported. Do a zoom extends and you should see the contour lines.

With the property palette open select a contour line and check that there is an OD table attached to the line and notice that the elevation is listed under the OD table and that the elevation for the Geometry is at “0”.

To get the OD Elevation value to the Geometry we need to perform an alter-property query on the drawing. Start by saving the drawing and close it, then open a new blank drawing or the project you need the contours in.

We start this by attaching the contour drawing that we just saved and closed, in the Map task pane on the map explorer tab right click the Drawing folder and select “Attach”.

Browse to the drawing and highlight it by selecting the name then click the “Add” button then click OK. The drawing should now be listed under the Drawings folder in the Map Explorer.

Now we need to get started on the query. On the Map Explorer, right quick on “Current Query” under the Query Library and select “Define”.

In the Define Query Dialog we need to click “Location” for the query type then select in the Location Condition dialog then click OK. Next we click on the “All”“Alter Properties” button in the option section of the dialog box.

In the “Set Property Altercations” dialog Click on the radio button next to Elevation in the Select Property section.

Now click on the Expression button to open up the Property Altercation Expression dialog. Expand the tree to get to the Object data field that contains the elevation. Highlight it by clicking on it and then click OK.

Back in the Set Property Altercations” dialog click on the “Add” button.

At this point we can click OK and return to the Define Query dialog select “Draw” for the query mode and execute the query.

HOWEVER! I want to go one step further with my query and set the major contours on a separate layer named Major and the minor contours on a layer named Minors. I can do this because my OD has one field in my sample named IsMajor. (see above screen shot) The values are 1 & 0, 1 for a major contour, 0 for minor. I am going to alter the layer property for the contours line by setting up a range table and use that for to place the contours on the correct layer. To do this while still in the “Set Property Altercations” I select the radio button next to the ‘Layer” property..

Then click on the “Range” button to start creating a range table.

In the Define Range Table dialog click new and give the range table a name then click OK. The next step is setting the conditions to use for the ranges. This takes knowing what the current OD values are and what you want to return the values as. In my case the values are 1 or 0, and I want them to return either “Major” or “Minor”. For my example it would be like so: In the Condition section, the operator is the equal sign (=) the “Expression Value” I type in 1 then in “Return Value” I type in Major. Then click the Add button.

Next I set the condition for the minor the same way, operator is the equal sign, for the “Expression Value” I type in 0, and for the “Return Value” I type in Minor, click the Add button again.

Once we set both conditions we can click OK. Now we need to set the rest of the alter property parameters. Back in the “Set Property Altercations” dialog, we click on the expression button and select the IsMajor field from the OD table.

After we OK the Property Altercation Expression and return to the “Set Property Altercations” dialog we select the range table we created from the drop down list and click Add.

We should now have two conditions or statements listed in the dialog.

We can now click OK and return to the Define Query dialog, make sure the query mode is set to Draw, and execute the query.

If everything worked right now we can open up the Layer Property Manager and set the color, line type or lineweight to the “new” layers to display the contour lines.

So with a little practice and trial and error we can take a simple 2d shape file and import then query it to make a good 3D drawing with proper elevations and display capabilities.

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