AutoCAD Civil 3D :: Gaps Between LiDar Tiles
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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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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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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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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Jun 13, 2012
How to get rid of this gap? Everything I have tried just causes overlaps.
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Apr 10, 2012
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?
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Dec 11, 2012
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?
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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.
AutoCAD Civil 3D 2012 SP4
Windows 7 (64)
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Oct 10, 2012
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.
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Nov 26, 2013
I have 400 files each represent a tile of contour at 0.5m interval, if I xref all into one dwg it is extremely slow. These files have some 3d blocks which represent xyz and I made a .net program to open each file with "readdwgfile" method. However turned out that the points are not dense enough to generate the same accuracy contours as the 0.5m contours.
I am going home now to use my home computer and see if it can handle all these files xrefed and then bind and explode.
Worst case in make another program to extract only the contours and insert into a blank database. Always difficult when not given raw lidar point files.
Total size for these contour files combined is 327mb.
We have microstation capabilities not sure if it can put in the file in an easier way. I can work with the xrefed bogged down file. But is there a way to only export what's shown ? I have frozen the layers for all other objects from all the references.
I estimated total points from contours will be 20 million. Since each generate about 50000 points. Which is still workable. The computer i use in the office just make this more difficult. Slow cpu. Difficult day. Spent 7 hours programming and got it figured out but didn't solve the problem. I should have known better 20 points are not enough to generate that look in the 0.5m contours.
Civil 3D 2012
Work: Xeon W3503, 12GB, Quadro 2000, Dell P2211H x 2
Home: 3930k, 12GB, GTX 590, U3011, QX2710
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Dec 11, 2012
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.
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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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Dec 2, 2011
AutoCAD generates gaps to my drawing, sometimes there is NO gap and then it says there is when I'm selection new are to hatch (puts the red circle to old place where it didn't earlier say there is gap!). I have tried to use Gap Tolerance tool first with value of 10 but it didn't work. After that I changed it to 1000 and it worked but the hatch area wasn't good. I also tried to pull line over other and trim it, didn't work either. Used also join but it didn't work.
I have used object snap always when I drew the picture. I have zoomed as much I can and there is no gaps.
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Aug 1, 2012
We are having issues with gaps in our drawings when we print using Autocad LT. It has been fine for months and one day it just started printing with gaps between certain areas. However the gaps are not consistent and the gaps only happens with lines and not text or images.
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Jan 7, 2012
I have access to OS tiles that I need to put on to a drawing and I copy and paste the tile into modelspace then add my blocks and all looks good, then close the file switch off computer.
Next day come into work switch on computer load 2012LT, open file and the drawings have gone except for the outline of the tile with the path name of that file (Like a broken Hyperlink)...
Do I have to somehow import the file in to the drawing to stop this from happening somehow?
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Aug 1, 2012
I have attached a part. On the four corners of the front face there is large gaps. I am unable to use the seam comand to fix these.
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Jul 11, 2013
I am plotting this using an OKI C821 colour printer.
It prints with gaps between the black text/lines and the red and green sectors.
I want to eliminate the gaps.
I have tried increasing`VIEWRES' to 20,000 and segements in a Pline arc to 1000.
REV-A: Plot settings jpgs added.
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Dec 3, 2013
I have a really big DWG file and want to tile it into 4 smaller files. Is there a function for that?
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Jul 17, 2013
I am doing a small drawing with bolts and nuts. I wish to show the centerline visible, but with CENTER2, and selecting the line for Property, I changed the Linetype scale to .25. However, the actual line on the drawing doesn't show a centerline but a continuous line. See, figures below. I wonder if the gaps between the small dash and the long lines can be increased.
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Jun 17, 2013
I'm referencing in a WMS image (a momochrome LiDAR image) which shows fine on the screen. However when I plot, the image won't -- all other aspects of the drawing come through. It's not on a non-printing layer. I've fiddled with RASTERPERCENT, RASTERTHRESHOLD, and the plotter properties (currently using a PDF plotter but I have tried others with no success) but can't get the image to come through. Adding to the frustration, other images on the same server (i.e. color aerial) come through and plot without issue. Why this particular image won't plot? According to the WMS administrator, there is nothing on their end that "locks" the image prevening it from plotting.
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Jul 21, 2011
I am currently drawing some roof tiles for a house in 3d. I moved the tiles to another drawing so i could get my machine to focus on the tiles rather than walls, windows, doors etc. My machine is still lagging hectically. Basically i would like to know is there a way i can perhaps make the roof tiles file smaller or a "block" of it so that my machine can run properly and i can import it into the drawing with the rest of the house. The roof tiles drawing is 40.3mb big. My machine isn't inadequate-hopefully.
I am on a mac running vmware fusion with windows 7 32-bit and when opening editing the roof tiles file my cpu % spikes to roughly 70% then backs quickly down to 50% and will not increase with Autocad not responding-leave it for a bit and it loads but lags a bit when i orbit, copy or whateva then back to not responding.
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May 13, 2012
How can I draw tiles in a specific rectangle? Say I have a rectangle of 10x20. I have tiles of 3x8. I want to fill the rectangle from bottom left with the tiles so they crop at the edges of the rectangle.
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Oct 10, 2013
As part of a study project, I have to describe the steps of assembly of a product (a car within a factory) with a series of drawings.
I've drawn them in the model tab, having each step of the assembly in a separate "tile".
My problem is that when I want to print these drawings in a pdf file, it takes me ages because I have to select and print each drawing separately (plot, select window, print for 40 drawings is very long).
How to be able to print these in a more "automated" process ? I've tried to put them in "layout" but I cannot manage to adjust the drawing to the print zone, on the page (like what you would do when selecting the window before printing with the "adjust to the page" option).
The scaling is not a big deal at this step, as long as all drawings have the same scale (all tiles have the same dimensions).
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Dec 6, 2011
I created a mold design of bicycle frame. when i generated core and cavity, i faced some problems.
it said,
1. there are small gaps between these edges (edge set 1, maximum gaps is 25.16917 mm. edge set 2, maximum gaps is 25.16917mm)
2. runoff surfaces penetrate the porduct (surface 1, surface 2, until surface 6)
below this post i attach the file.
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Aug 9, 2011
I'm stil relativelyl new at DCL/Lisp programming even though I've been working with it for quite a while.
What I'm trying to do is if the user selects a specific radio button I'd like it so the next tile either enables or disables depending on the selection. How would I go about doing something like this?
If needed: AutoCAD 2013 User using Visual LISP for editing LISP and DCL files
Also I have AutoCAD 2011 currently still available for us, but we are using AutoCAD 2013 for 99.9% of AutoCAD use
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Jan 24, 2013
how to render roofs correctly so I made this simple drawing..When placing the roof material on the... roof, it looks correct on the west slope but upside down on the east slope
I know how to rotate the image and bump for the material, but do I have to do that and create numerous roof materials in my drawing - one for each slope? Or is there a different way to map the material to the 3D object?
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Mar 28, 2011
Sometimes when UV unwrapping, the map, for some reason ends up as individual tiles, even though the mesh is a single object. How can I fix that? Every single polygon has thick, green lines - like seams. When generating normal maps, it simply comes back as 'squares' of nothing, but laid out accordingly to the UV layout, so it's useless and holds no detail what-so-ever.
There are no inverted faces or overlapping faces, so that is not it. I can't weld every single vertex - there are thousands of them, of course, so it's rather baffling. The vertices, though, are connected, so that too is not the problem.
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