Land Records. Drawing a curve knowing radius, central angle and arc length (plus tangent direction i.e. tangent curve to the left)

[Anonymous]

Good day/night.

I'm fairly new to Autocad. I have AutoCad Map 3D 2013 on my work desktop. In a deed that I am reviewing I have several curves listed that I'm having issues drawing. I know I should use the arc command. 

The first curve states as follows:

South 65d30'34" East 39.95 feet to the beginning of a tangent curve to the left; thence along said curve having a radius of 500 feet with a central angle of 20d43'46" and an arc length of 180.90 feet;

How would I draw this curve in Autocad?

Thanks for your time in reviewing my question.

Jeremy

[Pointdump]

Jeremy,
Welcome to the Autodesk Forums.
I don't have Map 2013, but there should be tools like these:

Dave

[Anonymous]

It does. I'm just stuck from that point on what to use and how to write it out.

[ChicagoLooper]

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@Anonymous wrote:

???????????

<<South 65d30'34" East 39.95 feet to the beginning of a tangent curve to the left; thence along said curve having a radius of 500 feet with a central angle of 20d43'46" and an arc length of 180.90 feet;>>

Sorry, but you have not provided enough info. You need to be more forthcoming.

What comes before South 65d30'34" East?

Better yet, upload the entire legal description, not just a part of it.

[Anonymous]

See attached. I can draw the straight lines easily. The curve though, I'm struggling with drawing it.

[Pointdump]

Jeremy,
"The curve though, I'm struggling with drawing it."
Me too. I can easily create property boundaries all day long in Civil 3D, but this is the first time I've tried any of the Map 3D tools for same. "MAPCOGOFUNCTION" is useless for points or lines. The arc tools are totally inadequate. Worse yet, Map 3D doesn't seem to know the difference between decimal degrees and DMS.

South 84-52-54 East 68.01'
South 65-30-34 East 39.95'
Tangent curve to left with radius 500.00' and central angle of 20-43-46 and arc length of 180.90'
South 86-14-20 East 30.80'
Tangent curve to right with radius 100.00' and central angle of 55-15-19 and arc length of 96.44'
South 30-59-01 East 246.58'
Tangent curve to right with radius 250.00' and central angle of 51-26-51 and arc length of 224.48'
North 31-29-14 East 148.40'
North 86-48-19 East 291.86'
North 00-20-14 West 1011.97'
South 81-17-39 West 295.53'
South 29-59-17 West 186.68'
South 15-55-09 West 243.78'
South 29-02-58 West 175.29'
South 76-18-35 West 150.26
North 84-52-54 West 147.72' to POB
Dave

[ChicagoLooper]

That legal description is over 100 years old. It's dated September 1919! Please explain in plain language, using the least amount of words, what are you trying to draw. Parcels? 

If you are trying to draw parcels, I would recommend using an up-to-date online source, such as county data, to draw (or download) the parcel boundary. The parcels may have been digitized since the time your legal description was created. Also, 'Claribel Road' may be critical since the legal description refers to the centerline of that road and the road has likely gone through modifications such as reconstruction, re-pavement, or widening since 1919.

Lot 23: 424404022000. Lot 22: 424404021000.

Legal descriptions, like the archaic one you reference in your original post, are commonly used as 'Exhibit A' in a mortgage, not as a source to draw. Exhibit A consists of pure words, no illustrations are involved. An online search quickly found an interactive map, which in turn, generated additional links to parcel maps.

Lots 22 and 23.

Parcel map for Monterey County.

Monterey County 'Survey Records Viewer' can be found >>HERE<<

[parkr4st · Accepted solution]

from a start point @Anonymous.95<S65d30'34"E Enter
USC OBject select the line
Continue arc option which will automatically grip the end of the line and draw a tangent arc .
Being a curve to the left go up and hold a polar snap @Anonymous<90 for example giving the arc center
https://handymath.com/cgi-bin/arc18.cgi?submit=Entry
enter radius 500. length of arc 180.90 calculate angle decimal is 20.72961 degrees

ARC center,start, angle snap to center, snap to the end of the line, enter the angle 20.62648
erase the first arc and the smaller arc and line are there.

USC W and repeat for the next line and arc

Slow going but it works in map3d

[Anonymous]

I work as a county mapper so I am using county data and trying to update the CAD drawing for those 2 parcels (and 4 others further south but I was able to do those). I'm more versed with ESRI products for drawing parcels/pipelines/etc but for this job I need Autocad knowledge. The senior mapper wasn't too forthcoming in how to draw it. Again I know how to draw the rest of it.. Curves wasn't something I've dealt with in my time here.

[Anonymous]

This is what I was looking for.

[Anonymous]

This works. Thank you so much.

[kfield111]

Coming from a boundary survey point of view:   Old legals like this are most definitely used to draw in parcels.  This happens all the time in the Illinois where descriptions are copied over years and years without ever having new legal descriptions written.

The history of a parcel can, at times, have a huge impact on its modern boundaries if those boundaries are in question.

In my opinion, to dismiss a description because of its age is reckless and is not in the best interest of the public.  We should use everything at our disposal and not just pick the easiest path.  Relying on the county parcel data to determine boundaries is a dangerous road.   All the tax maps we have ever used have a disclaimer on them saying they are for reference purposes only.  They are not surveyed lines.