# Thread: Contour Lines and Interpolating

1. ## Contour Lines and Interpolating

Registered forum members do not see this ad.

Does anyone have or is there an easy formula for interpolating to find the contour lines I guess is how you would put it. I am doing a Civil Drafting project and it has a grid of 18 horizontal and 12 vertical and they are 50' each square. I have the measurements, but cant seem to figure a formula or figuring them as they go down from 90' on the outer one, and then 80' and then 70' and so on.
Thank you.

2. Take the difference in elevation between two points and divide it by the distance. That will give you a rise per foot which can be used to determine the individual contours that fall between the two points.

3. I have that part, but I think I need the interpolated distance. cause after it says to use the measure tool and then using a polyline to connect all the points and then PDEDIT with a "FIT" command to make the polyline curve. So i take it there should be only one point between the 50' lines or maybe two points. I don't know.

I think I saw some post from individuals who were at Penn Foster taking Drafting with AutoCAD. This is the Civil Drafting project.

p.s. I am sorry for what are probably easy questions.

4. What is the contour interval?

Yes, there have been a few posts from some Penn-Foster students regarding the civil drafting project. Did you read any of them?

You do not have to apologize for asking questions.

5. Yes the Contour Interval.
And I looked at past posts from others on Penn Foster, but none on the Civil Project. But I did find things that are useful.

6. Shouldn't you be looking at the civil project then? Other projects aren't going to help you at this time.

7. I meant for other things, not right now while i am working on this project.

9. No I haven't.

10. Registered forum members do not see this ad.