AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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andy7918
Posts: 12
Registered: ‎12-05-2013
Message 1 of 16 (857 Views)
Accepted Solution

Creating a Surface Using shape files

857 Views, 15 Replies
12-13-2013 09:36 AM

I was given a job where i need to create a surface from a gis file. I have no idea how to do this, have been messing with my civ 3d 2013 a little bit and have been able to get a surface comprised of a bunch of polylines to appear (not a true surface). I will need to create profiles so i need a true surface. I downloaded a compressed shape file from the county and need to know how to insert this into a drawing and build a surface using my own surface style. I am familair with building surfaces using surveyed data, but this shape file stuff has got me pretty confused.  I could eventually figure this out myself, but i am hoping there's someone out there who can give some tips to speed things along.

 

The files i have to work with:

.dbf

.idx

.prj

.sbn

.sbx

"autocad shape source"

.shp

"autocad complied shape"

 

At this point it's whatever gives you the best Surface. I usually go with breaklines because adding the polyline contours as contours doesn't always match the original contours exactly. You can also adjust Weeding and Supplementing factors as well as the setting in Minimize flat areas. You have to add a little Art to the Science.

 

Allen

*Expert Elite*
AllenJessup
Posts: 6,173
Registered: ‎05-21-2003
Message 2 of 16 (840 Views)

Re: Creating a Surface Using shape files

12-13-2013 10:38 AM in reply to: andy7918

Start by importing the shape file. Make sure to import attribute Data and Check Import polygons as closed polylines.

 

mi.png

 

How you proceed from there will depend on what you get out of the shape file. If it's just polylines. You'll have to save the drawing, open a new drawing and query the polylines while using an Alter Properties to bring them to the correct elevation. Then use them as breaklines to create the Surface. I won't get into greater detail until you find out what you'll actually get.

 

Allen

 

 

 

 

 

Valued Mentor
KirkNoonan
Posts: 456
Registered: ‎09-23-2008
Message 3 of 16 (835 Views)

Re: Creating a Surface Using shape files

12-13-2013 10:52 AM in reply to: andy7918

Try this

 

GIS Surface.png

*Expert Elite*
antoniovinci
Posts: 1,780
Registered: ‎06-03-2011
Message 4 of 16 (826 Views)

Re: Creating a Surface Using shape files

12-13-2013 11:18 AM in reply to: andy7918

If you are lucky, that shapeset could be already 3D, so you should not query anything.

Feel free to upload it on http://ge.tt so we can advise you better, sir.

Contributor
andy7918
Posts: 12
Registered: ‎12-05-2013
Message 5 of 16 (819 Views)

Re: Creating a Surface Using shape files

12-13-2013 12:09 PM in reply to: AllenJessup

Followed your import steps, i have made it this far before. I have a bunch of polylines for contours, but still no real surface. If i open the "properties" dialog box for one of the polylines i have  a geometry elevation of 0.00, but i have a feature id with an elevation thats probably correct. How do i get from a bunch of polylines to a surface that i can edit to display with my own surface style? (plot styles, labeling, major/minor intervals, etc...) Do some of the other files that i recieved need to come into play somehow?

 

Contributor
andy7918
Posts: 12
Registered: ‎12-05-2013
Message 6 of 16 (815 Views)

Re: Creating a Surface Using shape files

12-13-2013 12:11 PM in reply to: KirkNoonan

Kirk, i have tried the method you showed before. How long does it typically take to build the surface? The ribbon command method you show seems to only crash my machine. I gave it perhaps 10 minuted to generate and never got anywhere.

Valued Mentor
KirkNoonan
Posts: 456
Registered: ‎09-23-2008
Message 7 of 16 (812 Views)

Re: Creating a Surface Using shape files

12-13-2013 12:18 PM in reply to: andy7918

It usually pops up the dialog box to map the elevation to the proper field in the shapefile data relatively quickly and then it churns for a while. If it isn't popping up the initial dialog box right away, then you probably won't get it to work in this case. It doesn't always work, but it is the simplest method to do what you are trying to do.

*Expert Elite*
AllenJessup
Posts: 6,173
Registered: ‎05-21-2003
Message 8 of 16 (810 Views)

Re: Creating a Surface Using shape files

12-13-2013 12:19 PM in reply to: andy7918

No other file needed. This is where you need to save that drawing, open a new one, attach the file you just saved and do a query using the Alter Propertied. http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=14478662&linkID=9240857

 

See: http://www.thecadmasters.com/wordpress/index.php/2011/03/16/assign-elevations-to-contours-from-an-es...

 

Allen

 

 

*Expert Elite*
mathewk
Posts: 2,790
Registered: ‎07-09-2003
Message 9 of 16 (784 Views)

Re: Creating a Surface Using shape files

12-13-2013 08:25 PM in reply to: andy7918
You typically don't need to query anything anymore since we have that surface from GIS tool. Unless, of course, it's not working. But there may be something you're doing incorrectly. Give Allen's technique a try as it was what we used before the new tool. Like Kirk said, attach the shape files so we can try it out.
Matt Kolberg
Cansel - Autodesk Division
http://www.cansel.ca/
Contributor
andy7918
Posts: 12
Registered: ‎12-05-2013
Message 10 of 16 (746 Views)

Re: Creating a Surface Using shape files

12-16-2013 02:19 PM in reply to: andy7918

Allen, i followed thge steps as outlined in your message, and was able to get all of the 2d polylines in the seperate drawing to attach in a second drawing. I did the query and the lines now have a z elevation. I need to turn this thing into a surface though, where do i go from here?

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