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Parking stalls along curves

44 REPLIES 44
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Message 1 of 45
Anonymous
4689 Views, 44 Replies

Parking stalls along curves

How are you drafting parking stalls along curves. I still go to LDT.

--
John Mayo, PE

Core i7 920 6GB DDR3
GeForce GTS 250 1 GB
Vista64
44 REPLIES 44
Message 21 of 45
Sinc
in reply to: Anonymous

I think all you're doing is using a Polar array, which is definitely documented.

The only thing that looks undocumented is that you can enter "C" instead of "P" at the prompt. But as far as I can tell, both options do exactly the same thing. Circular = Polar.

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 22 of 45
witzel
in reply to: Anonymous

I have never been able to get Polar array to work in the same way, even through VBA.

On the command line the prompts are certainly different using "C" vs "P"

It may in fact just be a subset of polar, just with different results and options. I do know that it works perfectly, for precisely laying out parking along curves. Something I have not been able to get polar to do.

Thanks,

Conan Witzel
Message 23 of 45
nmessina
in reply to: Anonymous

In all these responses, I can't believe nobody uses COGO points for calculating radial curves. I've always set temporary COGO points using the Creat Points Measure Object then select the curve and distance, typically 9 foot. Then I'd offset the curve 18' for the depth of the stall and draw my parking lot lines from the Node of the COGO point perpendicular to the offset line.

Occasionally you'll need to do that in reverse, where you first offset the 18' for depth then set your COGO points on the offset line depending on the direction of the curve. Just remember that the 9' with of the radial parking stalls should always be at the narrowest part of the stall.

You can also create an Alignment, if your row or parking stalls include tangent and curved lines, especially if at usual, the PC of the curve does not fall exactly on a parking stripe. Once the alignment is created use the Creat Points Measure Alignment to set COO points at 9' increments.
Nicholas, Messina Jr., PSM
Message 24 of 45
Anonymous
in reply to: Anonymous

I've used just plain plines and the base ACAD Measure command in the same
way since c. 1986..... the problem with this method, where curves are
concerned, is that the distance is measured along the curve, leaving you
with a slightly less than allowed width stall.

"Nicholas Messina"; "PSM" wrote in message
news:6232710@discussion.autodesk.com...
> In all these responses, I can't believe nobody uses COGO points for
> calculating radial curves. I've always set temporary COGO points using
> the Creat Points Measure Object then select the curve and distance,
> typically 9 foot. Then I'd offset the curve 18' for the depth of the
> stall and draw my parking lot lines from the Node of the COGO point
> perpendicular to the offset line.
>
> Occasionally you'll need to do that in reverse, where you first offset the
> 18' for depth then set your COGO points on the offset line depending on
> the direction of the curve. Just remember that the 9' with of the radial
> parking stalls should always be at the narrowest part of the stall.
>
> You can also create an Alignment, if your row or parking stalls include
> tangent and curved lines, especially if at usual, the PC of the curve does
> not fall exactly on a parking stripe. Once the alignment is created use
> the Creat Points Measure Alignment to set COO points at 9' increments.
Message 25 of 45
nmessina
in reply to: Anonymous

The minimum width is supposed to be at the narrowest part of the curve, then you draw the radial lines from that points. Thats why I made the point to note that at times you may have to place the cogo points along the other side of the stall.
Nicholas, Messina Jr., PSM
Message 26 of 45
nmessina
in reply to: Anonymous

See attached
Nicholas, Messina Jr., PSM
Message 27 of 45
Anonymous
in reply to: Anonymous

Yes, I agree. But..... If you take that dimension out to 3 or 4 places it
will be less than 9'. I have never been questioned about this by any agency,
but the fact remains they could.....and if you use the same method for
laying out lots, where the frontage is much greater, then those few
thousandth's convert to hundredth's and THEN the plan checkers squawk.

"Nicholas Messina"; "PSM" wrote in message
news:6232831@discussion.autodesk.com...
> See attached
>
Message 28 of 45
Anonymous
in reply to: Anonymous

I wonder if it could be done using a polygon? You would have to calc the
number of sides based on the arc radius to get the desired stall width. At
least it would create the stalls as chords to the arc verses along the arc
itself.
Message 29 of 45
Anonymous
in reply to: Anonymous

I thought I'd share an example of a linestyle I made for parking stalls in
Microstation. It makes the task relatively easy as can be seen in this video
clip. Hopefully the video clip will post with the attachment. Unfortunately
I don't know of any way to get this to work in Autocad.
Message 30 of 45
Neilw_05
in reply to: Anonymous

Unless the plan checkers can measure the stalls digitally do you really think they will notice? Also, how close can you expect the actual striping to be considering the stripes are 4 inches wide? Is a surveyor going to stake the stripes? Edited by: Neilw on Aug 8, 2009 5:03 PM
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 31 of 45
nmessina
in reply to: Anonymous

I always set cogo points, so that the dimensions are always accurate when the radial parking.
Nicholas, Messina Jr., PSM
Message 32 of 45
nmessina
in reply to: Anonymous

Parking stall widths are always measured from center to center of the parking strips. The 4" width of parking strips, in my experience has never been included in the minimum width specifications.
Nicholas, Messina Jr., PSM
Message 33 of 45
bretdt
in reply to: Anonymous

Has anyone figured out how to do this in AutoCAD? If so, would you be willing to share. . .I can't figure it out.
Message 34 of 45
Anonymous
in reply to: Anonymous

Hi bretdt,

This is a pure manual AutoCAD process for perpendicular bays

Make your self a block consisting of a single vertical line equal to the
length of a parking bay and with the insertion point at the top of the
line - give it a simple name as you'll have to type it to use it.

Draw your arc and then use the AutoCAD measure command.
Select the arc
Type B for block and type in the block name
Select Y when prompted to align block with object
Enter the bay width and you're there.

You will need to trim the end of the curve if it is not an integer
number of bays long.

Once you get it working, you can make your block show more detail such
as wheel stop kerbs.

If you need to bays on the inside of the arc, then you will either have
to compute the correct width, or offset the arc inwards and do the
measure command on the offset arc.


Regards,


Laurie Comerford


bretdt wrote:
> Has anyone figured out how to do this in AutoCAD? If so, would you be willing to share. . .I can't figure it out.
>
Message 35 of 45
mdriver1
in reply to: Anonymous

Okay. This is an old fashioned way of doing it and how I would set it up to survey out if a CAD file's not an option.

1) You have two curves- an interior curve which represents the entrance to the stall and an exterior curve which represents the depth of the stall
2) These two curves are at an offset equal to the required stall depth
3) you have to know where the total amount of stalls start and stop (call it POC to POC and not necessarily the PC or PT but could be)
4) You have to know how many stalls of course
5) find, on the interior curve, what angle subtends the required parking stall width (call it the chord, small chord whatever) at that particular radius
6) start turning angles and distances as all of the stall lines are radial

This was before CAD was the primary means BUT ensures accuracy. It was very easy to perform in a HP 48 loaded with a survey card because you could occupy and backsight a point and perform sideshots to your heart was content without 'traversing' to the next point, hence radial stakeout.

Mark Driver
Message 36 of 45
Neilw_05
in reply to: Anonymous

Here is a screen recording of a custom Microstation linestyle that creates the curbs and stalls all at once. The dashed line represents the 9' spacing for the stalls. Note how the curves stay tangent when the PI's are moved. In the end I measure the stall openings along the curve. The measurment is off slightly because I didn't snap to the ends of the stall.

http://screencast.com/t/MSUlBqkJuXv
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 37 of 45
Anonymous
in reply to: Anonymous

Hi Neil,

Your movie gave me the idea of defining an AutoCAD linetype to match at
least some of the Microstation functionality.

First
I then edited the file:
C:\Documents and Settings\User\Application Data\Autodesk\C3D
2009\enu\Support\AeccLand.lin
by adding the following:

*PARKINGBAY, 2.5 x 4.5 parking bay
A,1.25,-0.0,["l",STANDARD,S=4.5,Y=-4.5],1.25

I was able to load this linetype and in general it worked so long as the
inner arc was drawn. so as to maintain the 2.5 desired bay width. It
still suffered from the AutoCAD "dags" on the ends of the line and also
suffered from the "l" being too wide.

Next, I edited the file:
C:\Documents and Settings\Laurie\Application Data\Autodesk\C3D
2009\enu\Support\AeccLand.shp
by adding the following:

;;; Line for parking bay, testing
*134,2,MYLINE
014,0

This compiled successfully and I can add the shape to a drawing

I then modified the PARKINGBAY Linetype definition as follows:

*PARKINGBAY, 2.5 x 4.5 parking bay
A,1.25,-0.0,[MYLINE,AECCLAND,S=4.5,Y=-4.5],1.25

but when I try to load the file with the linetype command AutoCAD tells
me I have an error in the linetype definition.

I can use any of the other shapes in the AECCLAND.SHP file and the
linetype works.

I need an AutoCAD linetype expert to tell me what is wrong with my attempts.


Regards,


Laurie Comerford


Neilw wrote:
> Here is a screen recording of a custom Microstation linestyle that creates the curbs and stalls all at once. The dashed line represents the 9' spacing for the stalls. Note how the curves stay tangent when the PI's are moved. In the end I measure the stall openings along the curve. The measurment is off slightly because I didn't snap to the ends of the stall.
>
> http://screencast.com/t/MSUlBqkJuXv
>
Message 38 of 45
Sinc
in reply to: Anonymous

The way I usually create custom linetypes, I compile the SHP file into a SHX file. And I include the shapefile extension in the linetype definition.

What happens if you compile your SHP file into SHX?

You might also need to change your definition:

*PARKINGBAY, 2.5 x 4.5 parking bay
A,1.25,-0.0,[MYLINE,AECCLAND.SHX,S=4.5,Y=-4.5],1.25


All of my linetypes (including the ones created by Autodesk) use the SHX extension in the linetype definition. I'm not sure what Acad does if that extension is missing.

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 39 of 45
Neilw_05
in reply to: Anonymous

While you guys are working on a linetype solution, has anyone considered whether a dynamic block could work? With the new parametric constraints in 2010 I would think something could be made to work somewhat like the Microstation linetype, although I don't know enough about dynamic blocks to try it.

By the way, won't the custom Autocad linetype be affected by LTSCALE? Microstation linestyles can be set to maintain design units scale regardless of the linestyle scale setting of the drawing. I don't think we have that ability in ACAD.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 40 of 45
Neilw_05
in reply to: Anonymous

After digging in to parametric constraints it appears there is no way to constrain a line to stay radial to an arc, so the dynamic block idea is probably a no go, unless there is a way to do it without parametric constraints.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com

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