Cutting a section of a map

[muchew]

Hello,

 

I'm trying to make a cross section of a topographic map I was given in AutoCAD 2010. I have read up through the forums how to accomplish this, however I have been given about a 10 mile by 10 mile area. Where the area I need to create the cross section is about 2000ft by 2000ft.

 

Does anyone know how to just cut this 2000ft by 2000ft section out of the map to create a smaller drawing file?

 

Thanks,

Matt

[ReMark]

Are we talking 2D or 3D?

[muchew]

Hello all,

 

Ive been reading through the forums trying to get an idea of where to go. But i was hoping someone could give me a bit more clear picture of where I need to be going with what I need to do.

 

For my Landfill Design class we have been given a topographic area on a drawing file. We are given a small area on this map to create a landfill.

 

At this stage of the project I need to create a soil cross section (i have been attempting to do this with quickprofile.lsp.) I have been able to create a cross section, but having a hard time making it look nice enough to do any calculations out of.

 

Anyways, eventually I need to create a final grade (of the landfill) compared to the base grade from the existing contours. I will also need to calculate the volume of the soil I cut out. Any pointers on how to get there?

 

If this works, I have included some pictures of what I am dealing with.

 

My only autoCAD experience is from a 3 month introductory course (that was focused on interior design, not civil engineering).

 

[muchew]

 

 

[ReMark]

Just because a drawing has contour elevations noted on it does not make it a true 3D map. You have seen a USGS topo map (on paper that is) right?

 

You have absolutely no experience drawing in 2D, let alone 3D, in AutoCAD and you want to create a 3D site contour map?

[muchew]

I have a guide to creating a 3D contour, but I do not want to make one of the entire map. Just the little square box that is my area.

[ReMark]

Then it sounds like you can just put a box around the site on the 2D map (drawing) and using the EXTRIM comand "trim away" the contour lines on the outside of the box (keeping the ones inside) and erase anything else you don't need. The result will be all the contour lines you'll need to work with.

[CarlB]

To get volumes you will need to cut (create) lots of sections, determine area of cut or fill at each section, then use the "average end area mthod" to calculate volumes.

 

You can get an area at each section by drawing in the final surface, and use the "boundary" command to get an area between existing and final ground surface.

[Car5858]

Here is an example:

[muchew]

That sounds pretty straight forward.

 

How did you create your profile on the left picture? Did you use a lisp like quickprofile?

[ReMark]

This is really annoying. You've posted two questions three times each. Is there a concept here you're having trouble with?

 

PLEASE STOP CREATING MUTLIPLE POSTS OF THE SAME QUESTION IN DIFFERENT FORUMS.

 

Thank you. And have a sparkling day.

[Car5858]

That sounds pretty straight forward.

 

How did you create your profile on the left picture? Did you use a lisp like quickprofile?

 

No lisp was used, just the survey data.

 

On the top of the left photo are the stations. The left scale is elevation in feet. The left profile repsents the centerline of the driveway.

 

Start with the survey data, add the contours at the survay data points.

 

Add the length scale at the bottom. Then you have to do the cross section the same way. Then is is just doing the calulations for each box. Cut will be negative and fill will be positive.

[muchew]

I posted a different question, and linked that thread to here. I realized I may get better feed back if I explained what I was doing completely.

 

Thanks for the help Car5858.

[Car5858]

muchew

 

For future reference, maintain the same question is the same thread. If needed one of the mod's will move or rename the thread as needed.

 

Giving the most information is best. This way we have the info to base our questions on, and to answer your questions.

 

What you have not answered so far is:

 

What is the reason for the fill?

 

Do you need dynamic compacting?

 

What is the design slope desired?

 

Will this be a road bed or railway bed?

 

You need to look at the overall picture in your mind, and develop a draw order (work flow).

 

This process will save you time in the end.

 

Make sure you use the osnap features, this project will take some hatching. Place the hatch boundries on their own layer. All the other layers can be truned off when hatching. Remember that all the boundries must be closed.

 

Your welcome to the help.

 

Welcome to the forum.

[ReMark]

Will the end product be in 2D or 3D or both?

 

The OP states he's creating a landfill. I get the impression there will be no road bed per se.

[Cad64]

I posted a different question, and linked that thread to here. I realized I may get better feed back if I explained what I was doing completely.

 

I've merged your other thread into this one.

 

In the future, please just post your question once and then wait for replies. Cross posting only creates confusion. It doesn't help you get your question answered any faster.