I'm sry I recently posted a simliar topic but this time it's a bit different. I got an .asc file from a 3D-scan (see attachments) because I usually find that .asc make the cleanest surfaces (surface from DEM command) but when I make a surface out of the file it looks like the following images. I already googled for hours but smoothing the surface and all this commands don't help at all, so I guess it have to do with the .asc file? Maybe someone can help me.
Your most likely going to need to reduce the amount of data in the surface. 1m x 1m is far to much information for a TIN surface so you'll most likely want to simplify surface wizard to reduce the overall amount of data. This will most likely have little if any effect on the overall surface.
I re-read you post if your using an ascii file to create the surface as a DEM, change it and dont use a DEM as that is a grid surface and you better served loading the ascii file as part of the surface definition as a point file. That should get elevate some of the issue, but you'll most likely still need to run the simplify surface wizard, for performance purposes if its a large area.
Rick Jackson
Survey CAD Technician VI
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Thanks for the answer!
I don't think the problem is because of the amount of data, in the same project I'm using a 0,5m x 0,5m xyz-file with about 14million points which doesn't cause any troubles at all (sry I somehow can't attach the file, maybe because of the size)...it seems like Civil somehow have troubles connecting the single points from the point file.
I tried the following things like you said:
- Convert the .asc file to .xyz file with Global Mapper
- Created a surface with definition -> point file -> .xyz file
- used the simplify surface command
The .xyz point file instead of the .asc and DEM command didn't really change anything and the simplify surface command made it even worse 😛 although I don't really know how to use this command
You could try change the smoothing value of the surface properties, but once you do that, I think your going to see a noticeable change in file size.
The simplify surface wizard allow you to reduce the amount of data being used based on a percentage, so if you have 14milliion points and you simplify by 50% if will reduce the points being used by 50% or 7 million.
I think in your case you may be better suited in going to the Planning and Analysis Workspace (Map3d), importing the data into a Point Cloud and creating a surface from that.
Rick Jackson
Survey CAD Technician VI
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Here is what I got from the ASC file you shared.
I could not see the contours for some reason until I exploded the surface. After that I could see what was going on as shown below.
The reason for jaggedness I believe is just due to how the data exists. It is a raster data and it is triangulating to triangles that are about 1 foot.
The reason it is so jagged is because there is that much detail in the data.
Also the data is on a GRID not a TIN this also makes a difference.
Rick Jackson
Survey CAD Technician VI
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I did this in C3D16 using a Point Cloud with a 50 intensity and then a further reduction of the data in the surface using a simply to remove 70%. But it gets a little better.
Rick Jackson
Survey CAD Technician VI
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I also did some additionally playing around with this and when you increase the contour interval, from 1/5m to 5/25m there is a lot less jogging in the contour lines, which tells me that although the information is provided at a 1m interval its not intended for that sort of display resolution. Maybe check with the data source.
Rick Jackson
Survey CAD Technician VI
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"I can't use all that smooth and simplify commands since it would falsify my surface way to much or at least it would be way to undetailed then."
It might be a good idea to hire a surveyor (or by a drone), if you need accurate data to design from.
Rick Jackson
Survey CAD Technician VI
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I'd be curious to see the metadata or link to this data with 1m contours, as I see it the data that was provided is only good for doing 5m/25m contour intervals, and with the area that your getting that sounds completely plausible.
Rick Jackson
Survey CAD Technician VI
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When you create the RCP, reduce the intensity to like 30% or even less (you could probably do 10%). The problem is its just far to much information than you'll never need or want in a real world solution. I've done land survey work on critical infrastructure (airport runway) and with conventional methods and the grid was 25' that worked just fine. LAS/LAZ and drone data in general is just too much information and completely necessary, I embrace the technology but, but the current methods of transferring the data to C3D IMO SUCK
Rick Jackson
Survey CAD Technician VI
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