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how to draw a property line arc in civil 3d

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Entering Survey Data using AutoCAD

Introduction

These techniques utilise to basic CAD programs such as AutoCAD, IntelliCAD, etc. If you lot have a civil/survey program or addition, such as Land Desktop, SurvCADD, Eagle Point, etc., and so there are congenital-in tools for entering lines and curves.

Lines and tangent curves

Permit's say you have a newspaper plot or a legal description of a closed boundary. Let's work our manner effectually information technology. Below is an instance of what you might accept. Commencement with a line segment if there is 1. Let's start in the lower left (or well-nigh southwesterly) corner and work clockwise for this example.

For each line segment, a bearing and distance is given.

Start the ._LINE control and pick a starting signal. If you have XY or Northing and Easting coordinates, yous tin enter them, otherwise just pick any point in the drawing. So at the adjacent prompt enter @107.65<N28D45'21"Eastward.

Now stay in the line control and draw the next segment. Enter @27.23<S61D14'39"E

Now end the ._LINE command because you demand to draw a curve next. We volition presume that this curve is tangent to the previous segment (we'll embrace non-tangent curves after).

Draw a line perpendicular to the previous segment towards the within of the curve. Make this line the same length as the radius of the curve. You can apply the ._LENGTHEN command to set the verbal length. The opposite endpoint is the center signal for the adjacent curve. The prototype below is how information technology should look now (the greenish line is the new ane).

Now rotate this line, using the opposite endpoint as the radius point. Since this bend is to the right, rotate the line clockwise (meaning you volition have to enter a negative bending) the corporeality of the delta of the curve. -6035'03" in this example.

At present you take the 3 points needed to draw the ARC. Run into the moving picture below.

Start the ._ARC command, enter "C" for eye indicate and pick the endpoint of the line that represents the center point. Next pick the other endpoint of the line, that is the startpoint of the ARC. Next pick the endpoint of the previous line segment. Your curve is complete.

Now nosotros have another curve to describe. This curve is likewise tangent, but in this instance the previous entity is a bend. If the second curve goes in the same direction, information technology's called a compound curve, if the second curve goes in the contrary management, it'due south called a opposite curve.

Observe that this bend is to the left, not the right, so this is a reverse curve. We need to do the same equally above to detect the center point, except rather than describe a perpendicular line, we need to draw a radial line from the previous curve.

In this case we already take the light-green line in place, so extend it out past the last bend a chip. Now trim off the function that is inside the previous curve. It should look like this now.

At present use the ._LENGTHEN command to make this line 500 foot long (the radius of this curve). The other end is the center point for the side by side curve.

Now rotate this line the amount of the delta, but like before. Because this curve is to the left, the rotation angle will be positive, non negative. Now information technology should look like the picture below (the radius point is not shown since information technology is so far away).

Now you have your three points from which you can construct the arc.

The last line segment is synthetic merely like the kickoff ii. Start the ._LINE command and pick the endpoint of the last arc, and so enter @116.77<N86D32'54"W

Non-Tangent curves

The orientation of tangent curves is determined by the previous entity, but for non-tangent curves you need to know how the curve is oriented. This is the instance for non-tangent curves in the centre of a figure or if yous want to start your figure with a curve. Y'all can use either the Chord Bearing and Chord Distance or you tin use the Radial Begetting.

Chord Bearing and Chord Distance

The Chord Bearing is the bearing from the start bespeak of the curve to the end indicate of the curve.

Going back to the first curve in the figure above, we tin can run into that the Chord Bearing is N30D57'08"W. However, take a look at the effigy. Is the other cease of this curve really in the NW direction? No. This is something else you may meet. Depending on the direction y'all are traversing a effigy, yous may demand to contrary bearings by 180 degrees.

Remember, the Chord Bearing is the bearing from the start point to the end indicate so in this instance, the Chord Bearing is in the SE direction, non NE. So just supplant the NE with SW. The actual Chord Bearing is S30D57'08"E.

So now, draw a line that represents this Chord Bearing, using the same syntax every bit above. The cord you will use is @75.66<S30D57'08"E.

Subsequently y'all have this line, you can draw the curve. Outset the ._ARC command and select the start point, and then choose the "E" choice and pick the end indicate, then use the "R" option and enter the radius. If the curve is contrary of what yous expect, select the kickoff and end points in the contrary order.

Utilise this aforementioned technique for non-tangent curves.

Radial Bearing

The Radial Bearing is the begetting from the start point of the curve to the radius indicate of the curve.

If you are given a radial begetting, you can use this to lay out a non-tangent curve also. This line will run from the final endpoint to the center betoken of the side by side bend. In our original case, the radial bearing is not given simply it is S28d45'21W. And so start the ._LINE command and use the string @75.00<S28D45'21"W. It should look like this.

This should look familier. From this point on, you can follow the same steps equally above when you lot constructed the perpendicular line and rotated information technology.

Summary

Using well-nigh CAD programs including vanilla AutoCAD, you lot can enter survey data from a drawing or deed without needing any special tools or add together-ons. Withal, if entering this blazon of information is a frequent occurance, you may consider upgrading to a program that includes faster methods for this blazon of data entry.

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Source: https://www.cadtutor.net/tutorials/autocad/survey-data.php

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