North Rotation - Basis of Bearings

[cujo]

I'm curious how others are handling this situation.
Very happy with Carlson, have 8 seats and 3 of SurvCE.
Before I was using LDT.

We often are putting several maps together in a basemap. As often as not, the 2 or 3 maps might have different basis of bearings. The common lines from one map to another are of course the same line, but have different "record" bearings on each map.

A common solution (what we're doing right now) is to key in the maps separetly on assumed coordinates, then translate and rotate one to meet the other.

With the high number of CORS stations, now 95% of our surveys come into the office on a grid basis of bearings. We no longer set ourselves to a bearing from long ago, everything is GIS ready. Right off the bat, I have a map with a bearing between 2 found points that I want to set the map to. As described above, I have to key in the map and then rotate it to match the found monuments.

Now ... what I used to be able to do: In LDT I was able to set a "North Rotation" Of the various options I could pick two points or a line in the drawing and assign that an azimuth, or more likely, a quadrant bearing.

So, my control survey says this line is N05-00-00E. I have a map from the 60's that calls this line due north from whatever basis they decided to use. I want to put this map into the drawing and there are numerous sidelines or parcels that I want put in base don the relative angle between the lines, but relative to the found points.

If I told LDT that the line or points in the drawing needed to be referred to as North, then any other command from the COGO menu that promted or reported a bearing or azimuth would be rotated 5d clockwise to match the "north rotation". This rotation was only a local software setting, the CAD drawing didn't know what I was doing and it would be invisible to anyone else I sent the drawing to. We would use the feature many times during the course of bringing different maps into an agreement of basis and then turn the whole thing off at the end so we were reporting and labeling in our correct basis (not the maps).

Is there anything remotely like this in Carlson? Can I temporarily assign a rotation to the bearings?

I remember before LDT another method I used was to determine the difference in basis between maps and then on all but the main one I'd go in with a pencil and "correct" all the bearings to what I was going to key into the COGO routines.

Feel free to suggest other workarounds or point out where I'm missing this in Carlson Survey.

Rich

[emorse4487]

Rich, have you found a solution to your problem?

It seems as your problem is much more complex than mine, however we do get drawings from other companies who use north rotation on their drawings rather than d-view. I had sworn away from using north rotation years ago because of problems with the rotation angle mysteriously resetting itself half way through the project and causing bearings and things to be off. I do from time to time need to work on other peoples drawings who haven't seen the light yet, and this is definetly something that would be a good alternative to rotating and relabeling everything.

Let me know if you found anything as I haven't been able to figure this one out myself.

Thanks,

[cujo]

No, I haven't heard a peep.

When I've brought it up at the Carlson booth at seminars, I'm met with a blank stare.

It was such a HUGE productivity tool for me in LDT that I'm still hoping to find a solution or talk someone into adding it in. I mean, come'on everything and the kitchen sink has been thrown in (which can be both good and distracting or confusing) can't I have this? I promise, when people see how quick and easy it is to work with maps and this feature, they'll wonder how they worked without it. I would TOTALLY be OK with the feauture just being added to Visual COGO or just ONE of the other routines that allows lines to be input by quadrant bearings, it doesn't have to be all pervasive like it was in LDT. Add an option to that one cool routine with practiallcy A-Z options in the command line and let me type in bearings not based on the CAD North ... please?

OK, thanks for letting me plead my case again. I didn't even want to bring up the point you do (others not using CAD North) but therein with LDT it was also a great tool to allow you to work with people's screwy drawing. I'm mostly interested in just allowing me to quickly work with multiple maps sharing common lines but different BOB's.

[emorse4487]

Ahhhh ok I see what you're getting at now... That's an interesting way of doing thing that I never thought about with north rotation. In the past after rotating all deed descriptions to a common corrordiate system I just forgot about it. When it came about that we had to make changes to an original parcel that had be rotated I just calc'd the new bearings based on the updates coordinate system by hand or drew it in and rotated it on.

I see what you're saying now and that would have definetley saved me some time. The thought of using north rotation scared me for so many year I didn't even think of that!

[cujo]

Thanks for the comments on understanding the use of this capability!

I had even forgotten about the use you describe, which was more serious and 'dangerous' but an awesome available tool. A great way to deal with some screwed up drawings, when you don't want to distrub the CAD oriantation so you can still pass data back and forth with other team members; but you wanna get a good basis going for labeling and boundary work.

Good luck to us...