Dear All,
I am new to AutoCAD Civil 3D. We have surveyed the existing road alignment by leveling (at
an interval of 25m with an offset of 25m to both side of the road) to create
the NSL. Later on after some earthwork we surveyed the alignment again to
obtain the new levels at an interval of 25 meter. Now I want to draw cross
sections of the NSL and modified surface and calculate cut and fill. Is it
possible in AutoCAD Civil 3D? a step by step tutorial will be appreciated.
Thanks in advance.
Jamil Shah
Hi Jamil, this is exactly what c3d does. you will need to create two surface; OG and post grading FG, create sample lines along your baseline stationing, create section, compute material, add a table of volumes.
A lot to put in a post.
you will need to do the OOTB tutorials for:
* alignments
* surfaces
* sections
* volumes
Great! but i have data in the form of offset elevation for both the OG and FG at an interval of 25m having an offset of 25m of both side of the roads. To make it more clear the formate of the data is:
Section 12+00
offset Elevation
-25 300
-20 310
-15 311
-10 312
......
0 300
5 311
and so on
So will i be able to compute earth work quantities from this data?
Thanks
If you have LDD youcan use "Sample existing ground from file" function under cross section menu, Otherwise you can use this workaround in civil 3d; create offset alignments at -25,-20...,-5 and 0, +5,.....+20,+25...+50. Then extract N,E coordinates for your station interval for each alignment i.e. 0+000, 0+025.....0+100. so that for each station in every alignment you have Sta, N, E eg (0+000, 9200588,345555) then using excel paste your field elevations on the next column to have Sta, N,E,Z and save it as point file then generate surface and sections in civil 3d.
I have a lisp that can create sections directly but it works with autocad 2000 only
Thanks for the reply. Its a good workaround but it can be done by importing the file having station offset elevation, create the surface and draw sample lines as well and cross sections can be created. But my problem is that i want to draw the cross sections of the OG and FG and then calculate the earthwork quantities. Further help will be appreciated.
Thanks
What happened to Joe? He is the one that said how easy this is.
<G.>
Here is what I think. You need a finish grade profile to make cross sections, so this is somewhat backwards, you will need to make a finish grade profile from your final grade surface information. Then do the sections, etc.
(At least I think this is correct.)
Bill
Will this work??
Creates points along an alignment by importing points from an ASCII (text) file that contains station, offset, and elevation information.
The file you import can contain the station, offset, elevation, and description of each point. The elevation can be expressed as either a single value (elevation) or a rod reading with instrument height (rod, hi).
ASCII (text) files that use the following layouts (formats) can be imported:
Use commas or spaces as delimiters (separators) in the file. Include one or more comment lines in the file by putting a semi-colon or a pound sign (#) in the first column of a comment line.
The following is an example of data in an ASCII (text) file that is formatted using the Station, Offset, Elevation format:
The first line in this example is a comment line that is ignored when the points are imported. Each of the remaining lines contains the station, offset, and elevation for a point. The file is delimited by spaces.
#station, offset, elevation: subdivision 1
0 20.0 112.00
10 23.5 114.64
20 22.5 116.56
30 23.0 116.32
40 22.0 115.83
Before you import the file, you are prompted to describe the format of the ASCII (text) file. You can also be prompted to specify invalid indicator values for station/offsets, elevations, and rod heights.
Point settings, styles, layers, point groups, and description keys can all affect how a point is created or how it is displayed in the drawing.
neilyj (No connection with Autodesk other than using the products in the real world)
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Hello Bill, It does look easy <G>.
Seems like the hard part is the data source and a little massaging in excel and the section data should be importable.. Not in front of c3d but my suggested list of tutorials still stands <G>
Joe Bouza
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