How to Add X & Y Position Properties to Cogo Points

[cmclaughlinT5Q37]

I am working on a project that has two coordinate systems. The first coordinate system is a WCS in the Southern Ohio State Plane (NAD83). The second coordinate system is a UCS that reassigns a known point to (10000, 10000) and a baseline that has a Northing of 10000. Additionally, this same known point is designated as the project base point such that grid & ground northings & eastings are equal. Attachment 01 shows the transformation I used to achieve this. Note that the X & Y positions shown in Attachment 01 are User-Defined Properties that were hard-keyed.

The issue I am running into is that when I jump between WCS & UCS, the Northings & Eastings of my COGO points are always in the WCS. I noticed that for regular points (non-COGO), there are X & Y position properties that do indeed update to reflect the selected coordinate system. Is there a way to add something similar to X & Y position properties for regular points to COGO points? See attachment 02 & 03 which shows the behavior of regular point properties when I jump from WCS to UCS. This is what I want to achieve with Cogo Points. I understand I can simply drop regular points on top of the Cogo points, but I'm trying to avoid this. 

[Pointdump]

Hi Col,
I'm not sure I understand what you're trying to do.
Are you trying to work back-n-forth between Grid and Ground(10000,10000)? If you want to use the Transformation Tab you'll need to set it up differently.
Another option is to create a custom coordinate system.
Dave

[rl_jackson · Accepted solution]

On the Transforms Tab, were it says Local N & E place 10000 10000 there, and then for the Grid N E place the value of that point. I would recommend doing it by Point # this way you don't have to type the Grid NE. Once this is done remove the points and then insert them back into the drawing. You should have a Local and Grid NE in the point list. I would assume there is no rotation angle involde in the base point.

[rl_jackson]

Also, you may need to create a new Point file format that is set to your State Plane Zone so that C3D knows that the points are in Grid and will transform them to based on the transformation settings.

[cmclaughlinT5Q37]

Dave,

I tired this, and it does work, however, I'm looking for more freedom in switching between the WCS & the UCS that have been defined. Civil 3D doesn't have an issue doing this for lines, polygons, points, etc., but for some reason switching between the 2 coordinate systems doesn't effect the Cogo point properties. To be clear, I am looking for Civil 3D to provide both sets of ground coordinates for each coordinate system. The UCS is a shifted to make the project base point (10000, 10000) (both ground & grid) and rotated such that the site is oriented perfectly NS & EW. Please reference the attachment. The UCS (0,0) point is where the longer lines intersect & the coordinate system is oriented along those lines. I hope that makes sense.

Thank you,

Col

 

[cmclaughlinT5Q37]

Dave,

Is creating a custom coordinate system different that defining a UCS? If so, I will definitely look into this option.

[cmclaughlinT5Q37]

Rick, 

Thank you for your response. Please reference my response to Dave above. I am trying to achieve this without having to adjust the transformation settings every time I want to switch between the two coordinate systems. Also, I am importing the ground WCS coordinates, and I want to be able to switch coordinate systems and have C3D tell me what those ground coordinates would be in the UCS. The only concern I have with grid coordinates is that they are equal to the ground coordinates at the project base point, but it's not required that C3D spits out the grid coordinates for the UCS. I only need to know what the UCS ground coordinates are, which takes me back to potentially adding an X & Y position property (similar to standard points) to the Cogo points.

Thank you,

Col

[Pointdump]

Col,
Rick's way is definitely the path of least resistance.
Alan Gilbert shows >>>Here<<< how to create a Custom Ground Coordinate System. He shows a simple translation, but if you have at least 3 tie points to calculate the parameters it will easily handle scale and rotation.
Dave