Arch Length of Curved Site Lines

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DamonB
DamonB's picture
Arch Length of Curved Site Lines

V2012

Hi,

I would like to know how softplan users query arch length in softplan for pie shaped lots to confirm the arch is correct. SoftPlan does not have arch length anywhere. I would hope that perimeter would give me this but it gives me the chord length. My issue is this. My legal plans do not give chord lengths always, sometimes provide deltas over many lots but over all the info in inconsistent. i need to be able to possibly extend an arch length a set distance in a specified direction or at least know how long the arch length is. All i can figure out is that splines have curved lengths. if I could figure out how to convert an arch to a spline or draw curved property lines as a spline that would at least be a clean way to confirm some numbers. I am currently tracing a curve with a spline in tiny increments to get a ballpark and it is horribly unprofessional. Please understand I get lots that have 3 curved property lines and one straight one so this is very important to me. Any help would be greatly appreciated.

 

Thanks

DamonB
DamonB's picture
Arch Length of Curved Site Lines

Another creative solution. I just figured just now is to draw a single line polygon over my chord bearing. Set the deflection to the radius and you can see the arch length. I've been struggling with this for months. This is by far the best solution so far.  I still need to see if there is a way to extend a distance.

 

Thanks

 

DamonB
DamonB's picture
Arch Length of Curved Site Lines

Correction in my prior comment. I would query the distance between chord and midpoint of arch to get my deflection number not radius.

Bill Wimberley
Bill Wimberley's picture
Arc Lengths

Damon, your problem you are having with the arc lengths is exactly why I didn't use SoftPlan for site plans for a very long time.

I would suggest using another CAD program such as the free DoubleCAD XT to draw in your curved lot lines since it has much more robust arc drawing tools. You can start an arc and give it a radius and length. Then you can save to DWG and import into SoftPlan. If you want to convert the imported lines and arcs to Site Lines you can select Tools-->Convert Shape to Site Line.

Another option is shown in the tutorial Tangent Lines. It is a bit more involved but once you learn how to do it this way it becomes easier. Although not as easy as having an Arc command that you can give a length.

Bill is the owner and maintainer of SoftPlanTuts.com

DamonB
DamonB's picture
Arch Length of Curved Site Lines

Bill,

Thanks for the help. That is really good to know about you using a separate program for plotplans. We already have another program we can use for plotplans if needed. Old school geometry for drawing lots is how I started my career so most things I will still be able to draw. My big issue is checking the arch lengths as I am a professional. I have used that tangent technique for years with one time saving modification. I offset the property line the distance of the radius in the direction of the circle center. The end of the offset line will be the center of the circle.

I have made requests to softplan to improve upon this glaring arch length issue several times.

 

Thanks

Bill Wimberley
Bill Wimberley's picture
Arch Length of Curved Site Lines

Yep, I sometimes use offset to find the center of an arc. But in the tutorial I was assuming that you did not know the relative positions of the tangent lines, only their bearings and lengths. The method I described allows you to correctly position the lines relative to each other prior to adding in the arc.