AutoCAD Civil 3D :: Created Surfaces With Grading Now Have Gaps
Oct 13, 2013
I am trying to create a surface using the grading tool. I have a known top and a designed floor. I extended the floor surface out to meet the top breakline. I then use the grading tool to run a 3:1 down to the pond floor so I know where the true breakline is, but there is almost always a gap or two in my surface. It is usually less than a foot, but it has made my OCD kick in and I am going crazy trying to figure it out. I've traced of the breaklines, and the contours and added them to the surface to try and fix it, but that doesn't seem to work.
why I would get gaps in my grading from a single feature line? The feature line is at the same elevation all the way around and I am trying to grade to my existing surface at a 1:1 slope. No matter what I do it continues to leave out portions of the grading. I have attached a 3d image showing what's going on.
I have an existing topo surface created as well as grading for a proposed elevated pad of earth done in civil 3d 2013. I simply want to calculate the cut and fill quantities. I created the grading with automatic surface creation checked on. When I use volume tools to see what the quantities are, it says 0.0 for both cut and fill.
I created another surface (TIN) and pasted the existing topo surface and the proposed grading surface into it and I couldn't get any quantities.
I created another surface (TIN volume) and set the base surface as the existing surface and the comparison surface as the surface created from the grading but again could get no quantities.
I have created several pond embankments using the grading tools and have created surfaces using the grading groups. The problem I am having is when I turn on the triangles for one surface, I get the triangles for all the embankments and EG. The software keeps adding to the EG and doesn't cut out each embankment. I know I'm missing a step but I'm unable to find it.
As you can see in my attachment, I have a emergency spillway coming out of a dugout wetland. The fill area, the pool area, and the emergency spillway channel are all separate surfaces. All three of these surfaces are created from gradings. The fill was a feature line drawn around the top witdth of the dam, and then graded down to the Existing Ground. The channel is another polygon feature line with elevations at each PI and then graded up to the EG. The pool was a feature line I drew around the perimeter of my pool, laid on the surface EG, and then graded down to an elevation on a slope.
I'd really like to blend all the surfaces together. Right now, they are all separated with tiny slivers of Existing Ground.
How do I go about this? As you can see, I'm still pretty green with gradings.
I started with a points file which I created an existing surface called EG. I then used a number of feature line to create the gradings, grading surfaces and associated volume surfaces (compared to EG) also had other drawing elements and aerial photo in place. I had a lot of grading scenarios to do and it was all in one file. It was getting out of hand, so I duplicated the file, deleted the gradings (retained the EG surface) then added another set of new gradings and volume surfaces against EG. I did this in 4 files. So now I have multiple files that contain duplicates of the same EG surface and other features, but have unique gradings and surfaces referenced to those individual EGs.
Files all have similar structure:
+Various features (duplicated in all files)
- base aerial photo
- other drawing elements
- EG surface (duplicated in all files)
- Grading A-1 surface
- Grading A-2 surface
- Grading A-1 volume surface
- Grading A-2 volume surface
- Grading A-1
- Grading A-2
I recognise now that I should have data shared the EG surface from 1 file (and xrefed the other common drawing elements??) but given my situation now, what is the recommend way of putting it all together?
I am trying to create a grading in Civil3D 2012, for a stormwater pond design. The sides have a 3:1 slope, and on one side the pond follows natural pre-existing contours, and on the other side there is a construted dam. When I created the grading, the generated feature line has some crazy spikes that are >10000' high. The slopes all look fine, it's just the feature line thats wacky, but it won't let me edit it because its part of a grading, and if I delete it, the pond goes too. In the attached screen shot, the green suface is my existing ground, the blue is my pond, and the white is the problem feature line.
for each sample line it samples 6 surfaces. but i can't get the sampled surface object from the sampleline.
maybe need to commit something before running that code? like i think if i let the program finish just do the samplelines and add surface in. and then go in again it will show the section objects can be counted. bug in the com objects by autodesk? so many bugs all over the plac.
'create sample line Dim oSampleline As AeccSampleLine = oSampleLineGroup.SampleLines.AddByStation(oPoint.Name, dStation, txtLeft.Text, txtRight.Text) oSampleLineGroup.SampledSurfaces.AddAllSurfaces(oAeccDb.SectionStyles.Item(0)) For i As Integer = 0 To oSampleLineGroup.SampledSurfaces.Count - 1
Civil 3D 2012 Work: Xeon W3503, 12GB, Quadro 2000, Dell P2211H x 2 Home: 3930k, 12GB, GTX 590, U3011, QX2710
"An infill grading has no criteria applied to it. Any area bounded by feature lines or lot lines that is not already a grading can be converted to an infill grading."
So given an area enclosed by a feature line, an infill grading can be created. Using the same features line, an feature line grading can also be created. what is the difference between these two surfaces? They both have no criteria applied to them.
Is there a way I can fill the gaps in this surface? The surface is a combination of four pasted surfaces with boundaries set so they dont overlap on each other and create a mess.. I can't have these holes/slivers in it because SiteVision wont accept it. So basically is there a command that will fill the gaps in for me?
I'm working with an area around a couple miles of road running SW to NE. I have metric lidar tiles in GeoTiff format. The tiles are 1,500 meters on an edge. I'm working in US Survey feet.
I originally tried creating a Surface of all 9 tiles I needed and then cropped the resultant Surface. But that was too large for my computer to handle. So I created 9 drawing each with one tile Surface in it. Now I've created a Data shortcut Reference for them all in one drawing. I got all the Surfaces in but noticed that there were gaps between the borders.
I was wondering if it was a coordinate system conversion problem. But all the settings check out. Now I think that this may be an expected behavior. I measured the gaps between the Borders and found that they all ran very close to 6.56'. In metric that's almost exactly 2 meters. 2 m is the separation of points in the Lidar surface.
BTW I'm working this in 2014.
Civil 3D 2012 SP 3 / IDSP 2014 Dell Precision T7400, Xeon CPU 3.16 GHz Win 7 Pro, 64-bit,12 GB RAM, Nvidia Quadro FX 4600
I've attached an image of some corridor issues.I've looked at the corridor properties, profile targets, and eg surface and everything checks out. So why would the corridor place a void in the daylight of the back slope of the new ditch?
I have received some sedimentary data of a seabed. I also have other geological layers the sit beneath (all in XYZ format). I have created point clouds using this data and would like to create a surface in order to use the elevational banding to represent thickness. Here lies the problem.
When creating a surface from the point cloud (whole extent), C3D seems to fill in gaps in the data. Is there a way that C3D can create a true representation without all the lines joining parts up? I know that I can edit the surface by deleting lines but this is very time consuming and I'm wondering if there is an easier way to do this. This problem isn't exclusive to point clouds either, as it does the same when adding points to a new surface.
I have attached a couple of screenshots. The first shows a Point Cloud with colours showing the desired effect. Unfortunately C3D doesn't allow me to print this. The second image shows how the surface looks when created.
Is there an easy way to raise an entire site by 1.0 foot and have the grading hit the previous targeted surface? The only way I have found is to grab all the feature lines and raise them up by the required amount, but by doing that, the grading bogs down my system and it crashes, plus, I have grading attached to 3dpoly's and not necessarily all feature lines.
I am drawing a pond levy. I draw the outline of the top of the fill, set that at the elevation I want, then grade it down to the existing surface on a 6:1. The grading works perfectly. The outline of the fill's footprint shows up just fine around the back of the fill, but the toe line doesn't show up all along the front side of the fill, but I still get the slope lines projecting down in the front.
I am working with Civil 3D 2014, I played with 2009 back in 2008 and before that it was Land desktop. I don't know if I am not following a standard workflow.
Build the EG from contours.Layout the CL for the ROW and convert to a horizontal alignments.Create the profiles.Design the vertical alignment in the profile.Create the assemblies for the different types of road sections.Full profile, pavement width assembly, the curb return assembly, the daylight left / right, 1/2 side left / right, and pavement width left / right.Build the corridor, set the target surface as EG or FG, depending on where the section of the corridor is located. (At the edge of the property to EG, then after the first building pad to FG)This is where I have a thought something is wrong. If I am grading the entire site, why would I have the ROW grade to the EG, when I will need the surface to grade from the ROW to the closest building pads?Create the intersections, using the different types of assemblies, per the ROW sections.Create feature lines and use elevation editor to set all the elevations around the pad.Using the Grading creation tool, grade to surface, using a 2:1 side slope. Then adding an infill to the pad.
I keep having the file crash after grading about 10 lots. I recover and it works find, but then the file runs very slow, and will crash. I haven't taken any classes in Civil 3d, and am looking for one in my area.
I am use to creating the vertical surface then creating points along the CL, TBC, FL, BOW then creating break lines along the points. Then create a break line for the pads, and build the FG contours from these break lines.
Say I have a grading that runs north south and goes down 2%, up 2% and so on waffling along. Is it a poor practice to trace the side edge of the grading (in the same site) to add another grading to pitch east west?
I have a building pad where I created a grading of 5:1 to existing grade. I want to change one side to 20:1. How do I go about transitioning the 5:1 to the 20:1. I create the 20:1 and the contours just dead end into the 5:1 grading area
1 - The square helicopter pad is flat and grading with 2:1 fill, 1:1 cut. 2- The second FL is 2% slope down and grading with 2:1 fill, 1:1 cut. 3- The third FL is slope down to meet the existing road, both sides will same cut and fill.
I am creating a helicopter pad, with cut slope 1:1 and fill 2:1. But when i created a transition between the pad and existing road, i don't know how to. I have added a feature lines and make a separate grading but somehow it didn't work.
I have a platform at level 13.275m and nearby there is a retaining wall at aprox. level 4.0m.
For the wall i've made a surface using feature lines from EG till level 15.0m and then pasted into the EG surface to create the 'barrier' for the slope. But when i do the grading with the fill slope projection to surface, when it reaches the retaining wall section, the contour lines go crazy and if i do a quick profile, the fill slope line (obvious) is iregular, rather than a straight down line (2:1) going from level 13.275m till it hits the EG.
I've attached a picture to show the problem better.
I am tring to grade a complex object. Please see the attached document. The two grading objects are not interfacing correctly when graded although i can get the surface almost correct i beleive. Is there a way to remove this issue or the grading will not create a lot of difference when computing the volume clacs ( we are talking volum computation roughly about a million cubic metres cutting).
I have noticed that the value I get when I use the surface volume comparison tool or look at a graded item in the grading group properties box is different than if I calculate it by hand and the discrepancy isn't even consistant. After spotting this problem in a job I am working on graded two simple ponds to check this. The first one is 100' x 100' and 5' deep w/ 2:1 side slopes. Calculating the volume by hand I get 1500 cu. yds but the grading group properties come up to 1506.17 cu. yds. The accuracy is off by less than 0.5% The second pond is 100' x 100' and 2' deep with 3:1 side slopes. The hand calc gets me 654.52 cu. yds. and the grading group properties reads 655 cu. yds. This discrepancy is closer to 7%. I really need to know if I can trust the volume tools in the program.
I have a compost pad and retention pond to design, I set my back Pad line to surface and then graded to elevation so the slope to the pond will have no cuts
I created a pond and left out the grading to surface on the up hill side towards the pad which will be paved one day. I now created two side feature lines to enclose the whole pad and graded by distance and slope.
My problem now is the two side and back seem to blend together as I attached the feature lines together but I can not figure out how to blend into the pond create as it has side slopes to EG and the front which must join to the side slope crest to enclose the pad to drain into the pond.
It has been too long since I created Grading Objects and Proposed Surfaces. I am working in a file with my existing surface DATA Linked. I am creating a grading plan. I have created three separate grading objects in the Site named Proposed. One in the building, One is a new ditch, one is a graded existing ditch. I need to make these three with the unaffected areas of the existing surface into a new surface. How do I accomplish that . All my grading objects appear to be individually accurate and are created with a Feature Line and Grade to Surface Styles.
1 Do I create feature lines at toe , then vertical between the toe and the cliff , then use the grading & elev.editor 2 Once I obtain the infill surface l, how rotate or orient the model w/ rocks so this photo 3 is draped over it.?
I am having difficulty projecting an existing feature line at a specified tie-in slope. I have a steep (3:1) feature line that I need to project at a specific slope (2.5:1)to intersect a surface model. When I create the grading object the generated grading object is not 3:1 along the feature line and 2.5:1 perpendicular to the feature line. Instead I am left with a new slope that is 1.9:1 between the generated contours. I have attempted slope to surface as well as slope for a distance.My design criteria is to not exceed a 2.5:1 tie-in slope.