[LandXML] Re: Calculate height at start of ParaCurve
- From: Martin Pineault <martin.pineault@xxxxxxxxxxxxxxxxxxx>
- To: Richard.Bradshaw@xxxxxxxxxxx, daniel.lidstrom@xxxxxx
- Date: Thu, 26 Apr 2007 10:19:32 -0400
I know that InRoads let user do non-collinear vertical alignment. But this
information is lost in LandXML file!
So what should we do with it?
Martin Pineault
Directeur
Informatique OSG Inc.
-----Original Message-----
From: landxml-bounce@xxxxxxxxxxxxx [mailto:landxml-bounce@xxxxxxxxxxxxx] On
Behalf Of Richard.Bradshaw@xxxxxxxxxxx
Sent: 26 avril 2007 10:08
To: martin.pineault@xxxxxxxxxxxxxxxxxxx; daniel.lidstrom@xxxxxx
Cc: landxml@xxxxxxxxxxxxx
Subject: [LandXML] Re: Calculate height at start of ParaCurve
Inserting a PVI at a non-collinear element would be required and expected.
But I'm not sure how adding a PVI prior to each circular vertical arc helps
since no one else is writing the data out that way!
R. W. Bradshaw
-----Original Message-----
From: landxml-bounce@xxxxxxxxxxxxx [mailto:landxml-bounce@xxxxxxxxxxxxx] On
Behalf Of Martin Pineault
Sent: Thursday, April 26, 2007 8:50 AM
To: 'Daniel Lidström'
Cc: landxml@xxxxxxxxxxxxx
Subject: [LandXML] Re: Calculate height at start of ParaCurve
So LandXML should review there vertical alignment design to use the same
element method like the horizontal alignment!
Anyone listening from LandXML group?
Thank you.
Martin Pineault
Directeur
Informatique OSG Inc.
-----Original Message-----
From: Daniel Lidström [mailto:daniel.lidstrom@xxxxxx]
Sent: 26 avril 2007 09:35
To: 'Martin Pineault'
Subject: SV: [LandXML] Calculate height at start of ParaCurve
Martin Pineault scribbled:
> No problem,
>
> Yes, what I need is the starting point of the parabola is not on the
> line done by previous PVI and the PVI of my parabola. It's not
> collinear like in horizontal element. So you think we should just
> add a PVI with no length at the same position than the starting point
> of the parabola. This is ugly by the way; we will end up with to
> point on the same position? Exception case handling in the way!!
Aha, yes we have the same problem. Our system does not use PVI, but instead
we store start point of each vertical element. So when writing LandXML I
just
put a PVI where each vertical element begins. It is an ugly solution, but
that
is inevitable when storing tangent points instead of intersection points.
Here is what happens:
This nice vertical alignment:
<PVI>396560 61.83</PVI>
<CircCurve radius="50000"
length="75.0000270250073">396654.000021376 61.8298749849364</CircCurve>
<CircCurve radius="50000"
length="150.00005625405154">397214.069000002 62.6705001265687</CircCurve>
<CircCurve radius="50000"
length="424.98430684170251">398470.588193339 61.6940460906159</CircCurve>
<CircCurve radius="20000" length="399.98666596623877">399144
54.9601000075043</CircCurve>
<CircCurve radius="30000" length="599.980998999281">400708.9925
70.6098599892529</CircCurve>
<CircCurve radius="40000"
length="279.98748692798614">403042.899315129 47.2710531459537</CircCurve>
<CircCurve radius="40000"
length="120.00004499956418">404166.5177975 43.9000000000015</CircCurve>
<PVI>404226.518 43.9</PVI>
when read by Geo and saved as LandXML, becomes this:
<PVI>396560 61.83</PVI>
<PVI>396616.4435 61.8299</PVI>
<CircCurve radius="50000" length="75.113">396654.000022204
61.8298401712956</CircCurve>
<PVI>396691.5565 61.8862</PVI>
<PVI>397157.118 62.585</PVI>
<CircCurve radius="50000" length="113.902">397214.068976536
62.6704683743444</CircCurve>
<PVI>397271.02 62.6262</PVI>
<PVI>398240.0291 61.8732</PVI>
<CircCurve radius="50000" length="461.1067">398470.588178474
61.6940236793394</CircCurve>
<PVI>398701.1358 59.3886</PVI>
<PVI>398944.0136 56.9599</PVI>
<CircCurve radius="20000" length="399.9728">399144
54.9600720104529</CircCurve>
<PVI>399343.9864 56.9599</PVI>
<PVI>400409.0108 67.6101</PVI>
<CircCurve radius="30000" length="599.9635">400708.9925
70.6098839858111</CircCurve>
<PVI>401008.9742 67.6101</PVI>
<PVI>402902.918 48.6709</PVI>
<CircCurve radius="40000" length="279.969">403042.899315615
47.271095144993</CircCurve>
<PVI>403182.887 46.8511</PVI>
<PVI>404106.5147 44.08</PVI>
<CircCurve radius="40000" length="120.0065">404166.517829586
43.8999900034323</CircCurve>
<PVI>404226.5212 43.9</PVI>
<PVI>404226.518 43.9</PVI>
Exception cases very likely! :-)
Hälsningar,
Daniel
SBG AB
Phone: +4687112090
Fax : +4687112098
Location:
59 14'10" N
18 00'09" E
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