AutoCAD Civil 3D :: Simple Lidar Surface Clipping
Apr 19, 2013
I've been downloading whole tiles from OSIP for lidar surfaces. I've been using the grid files, and they work great. But, I don't really need an entire tile while working in my drawing, and I'd like to clip just my area of interest out of the tile. What is the fastest way to do this? These whole tiles are data hogs, and I fear they are slowing me down.
I used to have a computer at my old job that wouldn't slow at all using this stuff, so I haven't had a reason to learn how to do this until now when i'm forced to work on a laptop.
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May 28, 2013
I have a surface profile which has 2 surfaces in it. The surfaces overlap, and where there is overlap I just want to show one surface. Right now it looks like I'm going to have to smack a new boundary on the one surface to clip it, but I thought there might be a way to limit the display range of one surface in the profile.
Right now, I've only figured out how to do this so both surfaces are limited to the same range, but I can't figure out how to do it if you want to just control the range displayed of one surface and show all of the other surface.
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Aug 17, 2010
I have several LAS files that I have brought into AutoCAD and created PCG point cloud files. You have the option to assign Civil3D properties so I assign the LAS classification properties but they don't apply to the file.
The classification style seems to work with the ISD file extension in Civil3D, but do the LAS classifications not work for the PCG format?? I can only view the PCG file by single color or by elevation range, not by classification.
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Dec 20, 2013
In Civil 3D 2014 while import .las or .asc file using point cloud I keep getting an error in processing data message.
I have in the past brought in the data successfully (2012, though not often)?
Datum and projection are correct, the data goings in to ArcGIS(had GIS group five the file a try).
The error message in not any more specific than "there was an error processing data"
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Jan 14, 2011
I have recently upgraded to Civil 3D 2011 when we started receiving LiDAR data. I have been playing around with the data a bit and have a few questions on how the data is dealt with. It appears that when a point cloud is added to a surface, it is using the point cloud display somehow to generate the TIN. I believe that the point cloud display is showing a percentage of points based on the maximum number of 1.5 million points. On these particular datasets (citywide LiDAR coverage, about 2,600' x 2,600' panels), we may have 4-7 million points in each LAS file. Is Civil 3D ignoring all points beyond 1.5 million in surface building operations? Also, when adjusting the slider, is there any way to know which points will be displayed...or maybe the points are reduced randomly??
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Nov 19, 2013
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
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Jun 20, 2013
I wanted to import a shape file from GIS, but all contours elevations are 0. The attribute data on contours have ID elevation. How do I query those ID elevation to the contours?
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Aug 14, 2012
We have lucky enough to obtain LIDAR for most of our small City as well as ground only points. My problem is that profiles produced using it are rough and jagged (see attached). I've tried contour smoothing to no avail as well as point removal. Perhaps I haven't just tried enough options.
Should mention also I have breaklines along the CL alignment as well as Edge of Pavement.
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May 10, 2012
Succesfully producing a slope analysis exhibit using LIDAR topographic base information with this version of Civil 3D? I have followed the instructions as best I can and have had no luck. I am using a trial version and this is a big factor in whether or not I will ultimately make the purchase.
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Apr 1, 2011
I've been working on creating a sword in 3D Max for the last couple of days and have run across a problem. At the base of the blade, it goes up straight for about an inch and then tapers out and up another half inch in a curve.From there, the blade tapers/curves back in, then out once more to create a thicker end of the blade, width wise. I need to know a simple way of doing those curves. A friend of mine suggested using quick loops, then individually scaling them to get the curving effect. That just seemed like it took too much time to me, and I thought there must be a simpler way. I tried adding a taper modifier to the selected area, but that didn't really seem to do much, except give the opposite effect that I wanted.
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Nov 1, 2012
is there a simple way to superimpose print onto the surface of a photo in Lightroom 4 ?
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Dec 2, 2011
I often have to do storm pond surfaces that (for the purposes of planning) are flat on the bottom. These surfaces are created from a combination of survey data and grading groups and the tin of these surfaces is perfectably acceptable. However, when contours are shown, the flat bottom is shown with contours jig-jagging all over the place.
The attached image shows a comparison of the same pond. The top was created with survey data and grading groups; the bottom was created using contour data only. The generated surface on the top shows the bottom contour going in different directions and has parts where the an expected contour is missing.
How to correct/manipulate the surface to show a proper flat surface?
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Oct 22, 2012
Has instances where you set your tolerance for the maximum triangle lenth to say 50m to reduce the amount of triangles along the edge that run at long distances. When I do this I end up with multiple surface holes and I'm not sure why as there are points in the area.
I thought well maybe it's because i should've reduced my max triangles first then added breaklines. Would this matter? I also thought I could add a line to the surface to fix the holes vs. deleting surface lines along the entire edge of a surface for many many miles.
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Nov 14, 2012
I am trying to add points into a surface. I have done this before without any problems, but now I am having issues.
When I ID points which makes up the surface it gives me the correct Z level e.g. 24.5m, however when I hover over the surface it shows me the surface name and a different z level e.g. 0.65m. What is the reason for this difference in z levels? I think this may be causing the issue I am having when I add new points.
I select the surface and use the 'edit surface command' in the ribbon, choosing add point.
When I add a point at the level I require(23.89m), it puts it in a lot higher than the surrounding area, so I tried to put the point in to the lower z levels (0.4m) it puts it in a lot lower!
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Dec 10, 2012
My goal is coming up with the volume bounded by the design surface and the existing surface. I don't have the design surface modeled yet.
Do i need to create alignment offsets?. Alignment 1 profile view is also attached. Then Alignment2.
What about starting with alignment1 profile view? Since I have created a polyline as the design profile ?
how do I shrink labels? Where is it in the settings ; the Align folder had been check.
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Oct 2, 2012
I am issues with DEM files that I am downloading from the USGS website.I download 24k, elevation for the area I need. I then choose staged 1 second, add a surface to a blank drawing, then upload the DEM files to the surface.
The surface imports correcty, but when I try to import points taken by a surveyor on the same drawing, they plot incorrectly.The DEM surface and the points from the surveyor do not correspond. Also, the DEM surface is in meters, not feet. I have tried changing drawing settings, datum types, coordinate types, etc.
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Apr 4, 2012
Is there any way to change the referenced surface on a Surface Elevation Label. I can see the surface in the properties but cannot change it.
C3D 2011
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Jul 29, 2013
I have a project involving 3 programs. I am creating a planned development in 3d to be 3d printed when finished. The project is a 5 acre tract containing 8 buildings. I have built the surface in C3D and each building in Revit. The buildings are not in the same Revit file. For my solid work, I will bring the files over into 3ds Max Design to section into smaller quadrants to build in the 3d printer.
The questions:
Would it be better to import the surface into Revit to merge surface and buildings together?
Would it be better to import the buildings into C3D to merge entities?
Would it be better to bring those entities into 3ds Max and then merge them into one? Will 3ds Max Design allow me to insert entities accurately in the environment?
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Sep 15, 2013
I need to create a sub-set surface from my main surface. not sure what the vernacular is for a "subset surface" in c3d but i do have a feature line that bouinds the desired area, but that is as far as i can solve.
i did try creating a new surface - pasted the main surface in the edit definition, then deleted triangles until the boundary alighned wiht my featureline. This seemed to work, but when i view the properties of the smaller subset suface, it shows a mimum and maximum elevation that is incorrect.
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Mar 1, 2013
Im currently using an addon for Civil 3D called Novapoint. It allows me to create 3D models of surfaces made out of 3d faces and easily models cut and fill 3d-models for me.
The only thing i need to create a cut and fill model is one or several ground surfaces (existing ground, earth layers, rock etc. whatever i need) and a closed polyline/3Dpolyline that represents the level I want my cut and/or fill model.
I enter the spcifications I want such as; earth cut angle, rock cut angle, fill angle, select which surfaces i want to include in the model calculation and select the polyline.Novapoint then calculates the cut/fill model from the surfaces to the polyline and models the different cut/fill angles and gives me the results in a 3d-face model and a specification of the volyme of rock cut, earth cut an fill.
1. Novapoint is quite unstable and crashes alot
2. You cant create profiles out of 3d faces
3. Novapoint does not automaticly combine the start surfaces with the modeled cut/fill surface
4. A large surface made out of 3d-faces demands alot of computer power
So I want to how I do the same that Novapoint does for me in Civil 3D? (I have access to Civil 3D 2007-2013 depending on which one you're using)I know I can take the 3Dfaces i created in Novapoint and make a surface in Civil 3D with them but I want to exclude Novapoint completely.
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Mar 26, 2012
all of a sudden whenever I run audit on my corridor file the surface definition becomes a snapshot. To add to the drama, the corridor surface will not paste into an empty surface. Why?
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Feb 7, 2013
My problem added with pic ... I want to make volume calculate for sample road project. When I try to compute materials I cant use Corridor surface for DATUM... There is only target surface on option..
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Mar 6, 2012
I am trying to visualize a road project. The problems is, whenever the corridor surface goes below the EG surface (when the road is in cut) the EG surface is the only visible surface.
I sort of need to subtract the corridor surface from the EG surface, or merge the both surfaces into one.
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May 3, 2013
I was wondering if there is an easy way to trim one surface to another. Right now, I have two slopes (3:1) that are perpendicular to each other. They meet at a corner and I have extended them past each other so that I could see the intersecting edge. Now I would like to trim them to each other like you would a polyline etc... but I am not sure how to do this.
If I select surf trim, it tells me they are the wrong object type, but they are tin surfaces?
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Aug 2, 2013
I have Lidar files both IMG files and LAS files. I work in Civil 3D so have most Map 3D functions. We also have IDSP 2014 so I have a full version of Map 3D 2014 in there. The Lidar is in UTM - Meters. I need to create a Civil 3D Surface in State Plane - Feet.
Civil doesn't work with IMG files. I have no problem creating a Point Cloud from the LAS files using that to create a Surface. With the Zones set correctly in the drawings I can get the horizontal aspect of the data into State Plane. However the Elevations are still in Meters. If the LAS files were in ASCII. I would convert them directly, but they're not.
Is there any method in Map 3D to do a vertical transformation on either of these file types?
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
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May 17, 2012
I would like to open discussion about function that could easilly convert Civil 3D drawing with its all corridors, grading groups, feature lines etc. to regular AutoCAD 2D drawing to be able to hatch, measure, trim and so on. Is it clear, that corridor edit commands and features are not good enough to add another structures as stairs, culverts, parking lots with green islands and another civil structures...
Export to AutoCAD or AEC Explode converts drawing to some 2D/3D exploded hybrid, where it takes hours of editing, flatting and joining lines to make graphically correct and usable 2D drawing. And what worse, when the design is changed, user has to start from scratch again and again, which is not twice effective... And it is just directly against all Autodesk marketing phrases how to work smarter using BIMs.
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Sep 9, 2012
When I generating contour(surface) using Civil 3D it gives very complicated contours.Some times those contours cuts each other and have very strange shape.
I used to use SURFER software to generate contours.It gives simple contours.But I like to use Civil 3D because.
I attached SURFER contours and Civil 3D contours. I also attached AutoCAD file those who using older versing of Civil 3D.
I know how to smooth contours in Civil 3D but it does not solve my problem. You may say "You should use commands like swap edge,delete line .
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Apr 3, 2012
how do I use Civil 3D to do basic pipe analysis computations? For example, I give it the slope, material, etc. and it spits out the flow velocity, flow depth, slope min, etc.
All I want for now is a basic tool for sizing pipes without all the bells, loops & whistles. I can learn the fancy pipe networking stuff later.
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Sep 10, 2012
I need to export a .SHP file containing some polygons to a GIS user so he can lay the shapes in a GIS map. The data he needs from me is the outlines of several wetlands I've designed in C3D 2010. There isn't any elevation data associated with the outlines. They are just traced waterlines from each pool set into a layer called "permanent pools." He wants these to show location in a GIS plan.
When I try to MAPEXPORT, and then selct each of my 10 pool outlines, it says "no object selected" in the command line.
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Feb 13, 2013
I might be missing somehting completely, but I am reading with Civil 3D 2013 you should be able to clip a Point Cloud, but I am not seeing the clipping panel under the point cloud tab.
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Sep 14, 2012
I have a simple catchment area that I've routed to an inlet and then to an outfall. The 10 year storm peak flow going into the inlet is 3.91 cfs and my flow in the link to the outfall is 10.55 cfs. I do not understand why it is increasing going into the pipe. I've attached the pdf results here because for some reason it won't let me attach.spf file.
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