Here's the problem I'm running in to.
To generate the closures necessary to submit with my maps, I am using the Parcel feature in AutoCAD Civil3D 2015. And it works really well. Except...
I need to have my closure reports show angles to the nearest second and distances to the nearest hundredth. Which is no problem to accomplish by setting my Ambient Settings to display that.
However, in doing that, it reduces the precision of my closures. For nice shapes, like rectangles and such, it isn't a problem. But for complex shapes, especially when I have multiple compound curves with small radii and such, the little "rounding errors" will creep in. This normally only results in a closure error of 2 to 3 hundredths at the most. And the precision is at least 1 in 50,000.
But, one of the agencies with which I'm working refuses to accept this "large misclosure" because if the closure is not less than 1 hundredth, the map isn't "technically correct".
Now, if I change my ambient settings to show the angles to the nearest 10th of a second and distances to the thousandth, the "closure error" drops to well under the desired hundredth. But, then my report shows all of the courses to this degree of accuracy, and the person checking the map won't accept them.
So, my question is, does anyone know how to get the closure reports to have the nice, tight closure that I get from the 0.1" and 0.001' precision settings, but still have the report display only to 1" and 0.01'?
Alternatively, if someone can point me to a section of California Code that states that the "closure error" doesn't have to be under 0.01' as long as the precision is 1:50,000 or better (or whatever it may be). this would work as well.
thanks in advance!
-Syd
I don't know about your state, but in mine the State Board of Registration sets the minimum closure value, not some Little Napoleon in a state agency or private firm. Our closure / positional accuracy is set at NTE 0.05'. If you are nailing it at 0.01', you are as good as gold. If they want tighter closure then bill them extra and employ First Order procedures.
Syd
I am in California. Los Angeles County to be specific. Our Subdivision Ordinance specifies the allowable error of closure:
21.20.010 Standards for survey work.
A.
The procedure and practice of all survey work done on any division of land, whether for preparation of a final map or parcel map, shall conform to the standards and details set forth in Chapter 15, Division 3, of the Business and Professions Code, the Land Surveyor's Act. The allowable error of closure on any portion of a final map or parcel map shall be 1/10,000.
B.
In the event that the county engineer, county road commissioner, the State Highway Engineer or any city engineer shall have established the centerline of any street or alley in or adjoining a division of land, the final map or parcel map shall show such centerline, together with reference to a field book or map showing such centerline and the monuments which determine its position. If determined by ties, that fact shall be stated upon the final map or parcel map.
(Ord. 9071 § 11 (part), 1966: Ord. 4478 Art. 7 § 111, 1945.)
I'm no expert on Parcels, but I do know Civil3d.
Changing the ambient settings applies to the whole drawing. You can also change the default settings used for a specific command. Switch to the settings tab on the Toolspace and expand the Parcels group. Expand the Commands group and right-click on the ExportParcelAnalysis command. Hopefully somewhere in that list of options will be the one you need to change.
Good luck.
I think you are confusing map closure with measurement error. The map or legal description needs to close regardless of how tight your traverse is.
The BWho has experience in Civil3D 2015 and parcel closures?
The Board of Registration enforces the Minimum Standard. Any individual or agency can require a more stringent standard. The BOR has never written me check. the Client does.
Hi Syd,
Are you checking in "Enable Mapcheck across chord"?
Where is the result coming from? the Parcel properties dialog, or the Reports Manager in the toolbox?
Craig
I believe this is what I needed!
I'm still going through all of my reports to make sure it is doing what I want, but this seems to be making the difference. I've set the ExportParcelAnalysis settings to have the highest precision allowed. But the drawing ambient settings I've got set back to the desired level of displayed precision (0.01' distance and 0.1" direction). So far, it looks like it is giving me the report output I need.
I'll check back again once I determine that I'm in business with this.
thanks!
-Syd
Okay, it looks like I have the issue resolved. When I set the ambient settings in my drawing to the level of precision that I want displayed (nearest hundredth and nearest second) the report will display the way I want it. Then, when I set the specific ExportParcelAnalysis settings to have them out to the highest precision possible, it will use that higher precision to run the closure, giving me a closure report that indicates that the total error of closure is quite small (less than a hundredth).
Hopefully this will be the final resolution to this long-standing issue I've had.
Thanks all for you input!
-Syd