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Oblique equidistant azimuthal projection

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Message 1 of 16
nikoue
758 Views, 15 Replies

Oblique equidistant azimuthal projection

How can i define a Oblique equidistant azimuthal projection in civil 3d ?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

15 REPLIES 15
Message 2 of 16
Sinc
in reply to: nikoue

ADEDEFCRDSYS

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 3 of 16
nikoue
in reply to: nikoue

i know where
i cant find this type of projection
can i manualy create a projection?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 4 of 16
Sinc
in reply to: nikoue

I see what you mean... It looks like the closest projection to that in C3D is a Lambert Equidistant Azimuthal projection.

Why do you want this type of projection? Is it a standard zone somewhere in the world, or is it a custom projection for your particular project?

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 5 of 16
nikoue
in reply to: nikoue

its the projection of a old coordinate system in greece.
what about a custom projection?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 6 of 16
Sinc
in reply to: nikoue

Civil 3D lets you define custom projections, in that you can specify custom parameters for a type of projection. However, Civil 3D has to know how to create that type of projection, and it looks like it doesn't know how to create an "Oblique equidistant azimuthal" projection.

It occurs to me that there may be a way of approximating your coordinate system, using a standard oblique Mercator projection. If you are very close to the center of the projection, then there might not be much difference between an oblique mercator and an oblique equidistant azimuthal.

Out of curiosity, why do you want to use this projection? Typically, in Civil work, we like to use a conformal projection.

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 7 of 16
nikoue
in reply to: nikoue

i dont understand what do you mean when you say Civil 3D has to know how to create that type of projection, and it looks like it doesn't know how to create an "Oblique equidistant azimuthal" projection.
How let you define a projection.
I am looking in the folder geospatial coordinate system and i find files with extension .csd. From there civilreadthe projection?
i also have .csd files with the system witch i tolld you from my trimble program. is there a way to use it with civil3d?
When i say custom i mean to create myself the Oblique equidistant azimuthal" projection.
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 8 of 16
Sinc
in reply to: nikoue

There may be some terminology being mixed up.

The CSD files let you define a custom coordinate system. In other words, the CSD contains various parameters for the coordinate system. One of those parameters is the type of projection. But since the mathematics for each type of projection is different, the ability to handle a particular projection must be built-in to Civil 3D.

As long as C3D knows how to handle the mathematics behind the projection, all you have to do is specify the appropriate metadata. But when it comes to an entirely new projection method, it requires more than simple metadata. The equations that form the projection must be built-in to the software.

I don't suppose the "Equidistant Conic" projection will work for you...?

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 9 of 16
nikoue
in reply to: nikoue

No it doesn't
Is there a way to built in to the software, or only autodesk can do it?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 10 of 16
nikoue
in reply to: nikoue

Also can i transorm a dwg file from one system to another?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 11 of 16
Sinc
in reply to: nikoue

If there is a way to add a projection method, I don't know how.

You might try opening a support request with Autodesk. Open it with the Map team, and not the Civil 3D team - I believe the Map team is the one that deals with coordinate systems.

You can sort-of transform a drawing. You can use Map to connect to other drawings, and then use Map Queries to pull the data from the source drawings into your current drawing. Map transforms items as it queries them.

Unfortunately, Map Queries do not work on Civil 3D entities. So you can query plain Autocad items, but not things like Alignments, Gradings, Feature Lines, etc.

You can also use LandXML to transform items between coordinate systems. So, if you have a Surface in one coordinate system, you can Export it to LandXML. As long as you have the coordinate system correctly set in your drawing before doing the export, the LandXML file will contain coordinate system information. Then, when you import the LandXML, it is reprojected to the coordinate system of the drawing you are importing into.

So you can kind of transform things, in a very stilted, cumbersome, and often-incomplete fashion.

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 12 of 16
nikoue
in reply to: nikoue

Thanks a lot for your answers.
Have you heart if autodesk design Map Queries to work on Civil 3D entities in the future?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 13 of 16
Sinc
in reply to: nikoue

All I can tell you that it's been requested ever since the release of Civil 3D 2005. 😞

-- Sinc
http://www.ejsurveying.com
http://www.quuxsoft.com
Sinc
Message 14 of 16
nikoue
in reply to: nikoue

can you transform Alignments, Gradings, Feature Lines, etc using landxml?
AutoCAD Civil 3D 2013 Hotfix 3.
Win 8 pro x64, OCZ RevoDrive 240GB
Intel i7 930, 12 GB Ram, Ati Firepro V7800

Message 15 of 16
Anonymous
in reply to: nikoue

Hi,

And from a personal communication with a senior Civil 3D manager, it is
quite clear the Civil 3D team are as frustrated about this as we are.

Keep in mind that Civil 3D is built on top of Map, so it would take
serious effort at the Map level to 'anticipate' the Civil 3D objects and
deal with them. It is clear the Map managers haven't been prepared to
assign the necessary portions of their budget to this end.

Thus the decision to do it must be imposed on the Map team from a higher
level and you can imagine the internal politics of whose budget this
comes from.

Regards,


Laurie Comerford

dei-feif wrote:
> All I can tell you that it's been requested ever since the release of Civil 3D 2005. 😞
>
> -- Sinc
> http://www.ejsurveying.com
> http://www.quuxsoft.com
>
Message 16 of 16
Anonymous
in reply to: nikoue

Since the Beta testing is over, hopefully I am not going out of bounds with
this quote from Nick (somewhat out of context):


"You have a valid request, however it is a misnomer that Civil 3D is built
on top of Map. They are actually completely separate at this juncture. As
you suggest the only thing in common is the coordinate systems we share,
otherwise each product functions entirely without the other. Hence why it
is not as easy to simply have Map recognize our objects.

Hopefully you submitted a feature request for this item on the left hand
side menus."

Nick"






"Laurie" wrote in message
news:6368175@discussion.autodesk.com...
Hi,

And from a personal communication with a senior Civil 3D manager, it is
quite clear the Civil 3D team are as frustrated about this as we are.

Keep in mind that Civil 3D is built on top of Map, so it would take
serious effort at the Map level to 'anticipate' the Civil 3D objects and
deal with them. It is clear the Map managers haven't been prepared to
assign the necessary portions of their budget to this end.

Thus the decision to do it must be imposed on the Map team from a higher
level and you can imagine the internal politics of whose budget this
comes from.

Regards,


Laurie Comerford

dei-feif wrote:
> All I can tell you that it's been requested ever since the release of
> Civil 3D 2005. 😞
>
> -- Sinc
> http://www.ejsurveying.com
> http://www.quuxsoft.com
>

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