[lkhoury]

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Date: Fri, 2 Nov 2018 20:35:21 -0500
Subject: Re: Can I use a .tin from microstation and create a terrain in the mapper?
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References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
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Hi!=20
The method I know requires 3D analyst tool. If you don=E2=80=99t have licens=
e for that then I=E2=80=99m afraid I can=E2=80=99t help you.
Good luck!=20

Sent from my iPhone

> On Nov 2, 2018, at 11:46 AM, [email protected] [via HEC-RAS Help] wrote:
>=20
> hi lkhoury,=20
>=20
> I do facing same problem, I have tin file from microstation/geopak, want t=
o make a terrain in Ras mapper, can u guide me step by step, will appreciate=
s. I have access to QGIS.=20
> Thanks=20
>=20
> If you reply to this email, your message will be added to the discussion b=
elow:
> http://hec-ras-help.1091112.n5.nabble.com/Can-I-use-a-tin-from-microstatio=
n-and-create-a-terrain-in-the-mapper-tp3830p6615.html
> To unsubscribe from Can I use a .tin from microstation and create a terrai=
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Hi! 

The method I know requires 3D=
analyst tool. If you don=E2=80=99t have license for that then I=E2=80=99m a=
fraid I can=E2=80=99t help you.

Good luck! 

Sent from my iPhone

On Nov 2, 2018=
, at 11:46 AM, ibrahim_004@hotmai=
l.com [via HEC-RAS Help] <[email protected]> wrote:

 hi lkhoury,

I do facing same problem, I have tin file from microstation/geopak, w=
ant to make a terrain in Ras mapper, can u guide me step by step, will appre=
ciates. I have access to QGIS.=20

 Thanks

=09
=09
=09

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If you reply to this email,=
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http://hec-ras-help.1091112.n5.nabble.com/Can-I-use-a-tin-from-microsta=
tion-and-create-a-terrain-in-the-mapper-tp3830p6615.html

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To unsubscribe from Can I use a .tin from microstation and c=
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NAML

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[lkhoury]

I had the same issue. It turned out that the survey data was adjusted by a correction factor (eg: 1.006). Are you sure your survey data point do not have any issues?

[lkhoury]

When you convert from tin to raster using Arc conversion tool, there is a sampling distance (optional) in the conversion window. You can pick the sampling size there. My other guess for a low resolution of raster is that the tin itself has big intervals.
Hope that helps..

[lkhoury]

That’s exactly what I did.. I have a good surface on the project I am working with but I will keep an eye on the resolution and will let you know if I find something new. Thanks for sharing

[lkhoury]

I did. The depths and WSE values were the same and I have a pretty good jump in the channel. However at the outlet of a bridge and near levees the cross sections look different than the mapper. Even the XYZ is different and I was wondering myself which one is more accurate. It matters when you’re checking flood plains for developments.
Do you have any structures or levees? I am going to put the levee as a lateral structure and see if it solves the problem. If you find an answer I really want to know… hope that helped a little though..

[lkhoury]

I figured it out. If anyone encounters the same problem, please let me know and I will be happy to walk you through it.

[Author]

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