Hi there. First off I'd like to say that I'm in the land surveying field, so I'm new to the layout of AutoCAD Civil 3D 2013. Previously I have used AutoCAD Land Desktop.
I work primarily in 2d space and have set up my templates and settings to reflect those I used in Land Desktop. Working on a few drawings today, I noticed when I went to dimension a building to the boundary line, the perpendicular command would become skewed and snap to a point far down the line. When pulling the lengths with the distance command, the same thing would happen. When I pulled the lengths and checked my math, I noticed the dimensions were utilizing delta-z dimensions rather than the delta-x or delta-y.
I know these two are related and I have searched the web for an answer, but I couldn't find anything related to surveying. Thank you in advance for any help.
Solved! Go to Solution.
Solved! by TRogers. See the answer in context.
You will need to change the point style to reflect flattening them to elevation 0...
Solved! by jmayo. See the answer in context.
Ok point num 43 is off the parcel and it has a desc of CHK. I do not see any point marked as a brick column and I see only magenta lines and arcs.
Note that your prop lines all have varying Z values as do your points and blocks. Acad snaps perpindicular in 3 dimensions so if your start and end points do not have the same Z value the perpindiclar will not be correct for plan measurements.
The best way to get a perpindicular to your prop lines is to FLATTEN the prop lines to elv zero and set osnapz to 1.
You are snapping to points with different z values.
When measuring, dimensioning you may want to set the OSNAPZ system variable to 1.
If you are snapping to points you may want to use point styles (or edit the one you use) that display the points at z=0
Thanks for the quick reply John!
My OSNAPZ settings were at 0. When I changed it to 1 it made the skew much worse. As far as adjusting the display to be z=0, I deal with northing and easting location. Could it be when I rotate the boundary its skewing the dimensions because I've messed up its alignment with GPS or some other thing? I'm currently working my way through a "how-to" book but I have not seen anything about altering a project-wide rotation base.
Sounds like your UCS is off. Reset it by UCS>World, then PLAN>World.
Ok first, in my last post I should have started with, "I think.."
Without seeing exactly what you are snapping two and what comands you are using this is tough. Posting a file would help.
If you draw a polyline across the dim lin does it skew?
Are you in a plan view? World coords?
Are there multiple objects under the line you are snapping perpindicular to?
I wouldn't think this has anything to do with GPS. I am still thinking this is the measure or dim is working with an elevation change somewhere. If you temporarily go to a Right View, does everything appear to overlap as a line at elev 0?
The dist and dimension object commands should work fine with a rotated UCS.
.. But the x,y, and z will be switched.
Yes the UCS will set that back but the values are good. I would think there is something else if the dimensions are skewing.
My bet is on the points being inserted at elevation. I'm a surveyor too, and it drove me crazy, until if found how to insert the points at 0. Another issue that may be encountered is line styles may look wrong. A dashed line with a large z difference will not look correct when plotted, especialyy is there is a large difference in the z value.
yes, i use it often, but when you have unlocked points in the dwg, you have to crash out to keep it from changing all of them. Is there a way to cancel without crashing the dwg?
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