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compute angles relative to true north

17 REPLIES 17
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Message 1 of 18
darreng_oa
3037 Views, 17 Replies

compute angles relative to true north

line property angles seemed to be displayed in bearings.  is there a way to change this to display relative to true north?

 

thanks, oa

17 REPLIES 17
Message 2 of 18
HansSMS
in reply to: darreng_oa

Type UNITS, bottom of Dialog hit Direction Button, Direction control dialog select North 270d0' This sets your North refernce to AutoCAD's 270°.
Hans Moller
Surveying & Management Services
Gladstone Australia
Metabox 16GB, Intel i7-9700K 3.6Ghz, 500GB SSD, 2TB HDD Nvidia GTX 1060
AutoCAD Civil 3D 2018
Message 3 of 18
Pointdump
in reply to: darreng_oa

Darren,

 

This might be a place to check:

 

Bearing3.png

 

Dave

Dave Stoll
Las Vegas, Nevada

EESignature

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024
Message 4 of 18
odoshi
in reply to: darreng_oa

If you want azimuths, you can look in the command settings for Parcels or maybe make a custom Label style.

Regards,
Mike
Mike Caruso
Autodesk Certified Instructor 2014
AutoCAD/Civil 3D Autodesk Certified Professional 2014, 2015, 2018
www.whitemountaincad.com
Message 5 of 18
ericcollins6932
in reply to: Pointdump

Similar to this, you can also fix your labels to show north azimuth. Pretty sure they are in bearings by default.

Eric Collins, P.Tech.(Eng.)

Win 10
Intel i7 9700 @ 3 GHz
16 GB RAM
Civil 3D 2019
Message 6 of 18
darreng_oa
in reply to: darreng_oa

no luck. still cannot figure out what the angle number is in properties. my goal is for it to display the direction the line was drawn, with north = 360, east = 90, south = 180, and west = 270. currently, i have to determine the quadrant the line is in, and then adjust accordingly.

thanks!
Message 7 of 18
Pointdump
in reply to: darreng_oa

Darren,

 

Please clarify what you want to do. Are you trying to label a line with Azimuth? How about a screen grab showing us what you'd like things to look like.

 

Dave

Dave Stoll
Las Vegas, Nevada

EESignature

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024
Message 8 of 18
darreng_oa
in reply to: Pointdump

hi dave - thanks for the quick reply

i have a series of lines on a map in civil 3d, and i in need to follow those lines in the fieled using a magnetic compass. so therefore, i need the heading for each line.

thanks!
Message 9 of 18
Pointdump
in reply to: darreng_oa

OK, Darren, then it looks like the easiest will be to convert them by hand. Amazingly, I can't find a way to simply label a line with an Azimuth. I thought that would be the easiest way, and I'm sure it can be done, but I wasn't able to find a way.

 

Any data collector usually has a quick-n-easy function to convert between bearings and azimuths, and there's probably a conversion App for your Smartphone. Civil 3D has a really cool Quick Calc that should be able to do those conversions quickly and easily, but I can't figured out how to use it.

 

Sorry I'm not much help.

 

Convert.png

 

Dave

Dave Stoll
Las Vegas, Nevada

EESignature

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024
Message 10 of 18
AllenJessup
in reply to: Pointdump

I would have thought that creating a Label Style was all that would be needed.

 

az1.png

 

However that doesn't work when I try it. From 0° to 180° it labels the line at 90° 00' 00". From 180° to 360° it's labeled 270° 00' 00".

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 11 of 18
AllenJessup
in reply to: Pointdump

The math is fairly easy. In the NE quadrant you've already got the angle. In the SE quadrant subtract the angle in the Bearing from 180°. In SW add the angle to 180° and in NW subtract the angle from 360° I had to do that all the time when leading a Survey party. It helps to have a calculator that converts decimal angles to DMS.

 

Quick Calc Quadrant is a Quadrant Snap to a circle.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 12 of 18
AllenJessup
in reply to: AllenJessup

I found out that the Label Style does work. My drawing had some serious damage. That's why I got those results.

 

az2.png

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 13 of 18
Pointdump
in reply to: AllenJessup

Allen,

 

I'm not sure how Quick Calc Quadrant works, but that would sorta explain the preposterous numbers I got.

 

Quadrants.png

 

After your success with Azimuth labelling, I steeled my resolve and figured out how to label a line with an Azimuth:

 

Az.png

 

For a while, I thought I'd punched a Tar Baby on this topic.  SmileyWink.gif

 

So Darren, to answer your original question, I don't know how to get Properties to show an Azimuth, but a Line Label is definitely do-able.

 

Dave

Dave Stoll
Las Vegas, Nevada

EESignature

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024
Message 14 of 18
AllenJessup
in reply to: Pointdump

Good work Dave. Whatch those old references. The Quick Calculator is just a GUI for the geometry calculator. See attached.

 

allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 15 of 18
Pointdump
in reply to: AllenJessup

Allen,

 

Thanks for the Geometry Calculator Manual. Did you write it? It's brilliant!

 

Dave

Dave Stoll
Las Vegas, Nevada

EESignature

64GB DDR4 2400MHz ECC SoDIMM / 1TB SSD
NVIDIA Quadro P5000 16GB
Windows 10 Pro 64 / Civil 3D 2024
Message 16 of 18
HansSMS
in reply to: AllenJessup

The original question was how to get the azimuth to show up in the line roperties under the angle item. My solution works, provided you have North straight up the drawing. If not, set a UCS to the Y-axis is in line with your North, and the angle item in the line properties box will show correctly.
Hans Moller
Surveying & Management Services
Gladstone Australia
Metabox 16GB, Intel i7-9700K 3.6Ghz, 500GB SSD, 2TB HDD Nvidia GTX 1060
AutoCAD Civil 3D 2018
Message 17 of 18
AllenJessup
in reply to: Pointdump

No Dave. I compiled it from various AutoCAD help files and added a little explanation here and there. This was a long time ago when Help files were truly helpful. I don't think I could do the same thing today.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 18 of 18
AllenJessup
in reply to: HansSMS

Yes. That will work. However I stay away from the Units dialog. I use the recommended AECDWGSETUP. I'd be worried what changing the orientation would do to Civil if someone forgot to set it back to 0. I don't let anyone here use UCS for the same reason.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

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