Inroads works with Microstation while Civil 3D works with AutoCAD. Civil 3D is seamlessly built into the AutoCAD interface while Inroads is a separate window. This highlights the first main difference: integration with the CAD platform. Civil 3D’s integration into the user interface makes transitioning from AutoCAD to Civil 3D easy. Compare Civil 3D with AutoCAD, Infrastructure Design Suite, InfraWorks 360, and other Autodesk civil engineering design software. Explore the connected workflows of BIM for Infrastructure. AutoCAD Civil 3D 2018 delivers powerful new tools to help optimize designs, improve project quality, accelerate detailed design, and streamline delivery. Select up to 3 to compare The default product cannot be deselected from the comparison. May 15, 2017 SolidWorks is what we call a 'parametric' solid modeller used for 3-D design. Parametric means that the dimensions can have relationships between one another and can be changed at any point during the design process to automatically alter the soli.
Obtain feature lines from a surface or relative to a surface, so feature lines update with changes to the surface.
Create dynamic offset profiles using a default cross slope. Modify them by editing the profile properties.
Create a new dynamically linked alignment and profile that transitions between 2 intersecting alignments and their profiles.
Resize pipes and reset inverts, and compute the energy and hydraulic grade lines according to HEC-22 2009 standards.
Create plan/plan and profile/profile sheets by including multiple plan or profile views on a single sheet.
Add custom data to Civil 3D object labels by using property sets.
Create points, lines, and curves representing traverse legs and sideshots using COGO input and editing tools.
Resolve corridor bowties in daylighting conditions.
If you are using an AutoCAD-based product that is 2017 or later, you may have noticed that in your handy “Drawing Units” dialog, in the drop-down under “Insertion Scale,” you now have two options for working in feet. They are “Feet,” and “US Survey Feet.”
It may be a big surprise to many people to find out that a “foot” could be anything other than what you’ve got on your tape measure or your Architect’s Scale. But if you’re a Surveyor or a Civil Engineer, this is something you’ve probably dealt with before. Here’s a quick overview:
The two types of “feet” that AutoCAD deals with are US Survey Feet and International Feet (A.K.A “Standard Feet” or simply “Feet.”) “Why?!” you may ask. Well, the reasons stretch all the way back to the mid-1800s. Researching this is a fun history lesson, but in this blog, we are going to concentrate on how this affects us today.
First, let’s understand the difference between the two types of “feet.” The actual measured difference is very small, with one being derived as a decimal of a meter and the other being defined as an even fraction of meters:
As you can see, the US Survey Foot is slightly bigger, although not by much. This means that there are less US Survey Feet per meter than there are International Feet per meter. The ratio between the two is literally 2/100,000 or 0.000002. So your next question may be “Why does this matter? It’s so small!” Well, if you are dealing with small measurements, then it may not matter very much at all. But once you get into measurements over miles of road or pipe, and/or if you are working in State Plane coordinates whose values are often in the hundreds of thousands or even millions of feet, the conversion becomes pretty significant. Let’s look at how this affects a 50-meter building.
So far, not too bad. The difference is only about 3 ten-thousandths of a foot, which is only about 4 thousandths of an inch and is negligible. But, let’s take a look at something bigger, like the coordinates of a single sewer manhole in Virginia State Plane (South Zone) coordinates:
Notice that the difference between these is more than 23 feet in the X direction and over 7 feet in the Y direction! That’s a pretty big deal, right? The National Geodetic Survey has a great video that discusses the difference between International Feet and US Survey Feet, and why it is important to know which foot you are using. So if you want to understand this a little better, click here.
So what does this mean for AutoCAD users? Since AutoCAD now knows the difference between these two types of feet, it will convert one to the other during XREF and block insertion. If you have a drawing that is set to International Feet and you XREF it into a drawing that is set to “Feet,” the program will perform a conversion calculation and the coordinates in the XREF file will be shifted in the current file. This shift is not something you will readily notice in the XREF or the Block Insert dialog prior to performing the conversion. You may think you’re just fine because the insertion/XREF dialog shows a Scale Factor of 1, as shown below:
This is a product of the precision setting in your drawing being set too low to show the 0.000002 difference.
If you change the precision in your “Drawing Units” to show more decimals, as shown above, you will see the difference (illustrated below).
This can be extremely dangerous if you are dealing with drawings from AutoCAD 2016 or earlier since only the “Feet” option previously existed in the Units dialog. If you begin working in US Survey Feet now, then any legacy drawing you XREF or insert will come in shifted. With this knowledge, you may wonder why you would want to move to US Survey Feet at all. The answer comes if you or any of your contractors, partners, Surveyors, GIS Suppliers, etc., are working in State Plane Coordinates. Their coordinates will be in US Survey Feet and their drawings/files may very well be set that way. So if you are still working in Feet, then any attempt to insert this data could cause a shift that you may or may not even notice.
We have established that working in US Survey Feet may be very necessary for professionals like Civil Engineers and Surveyors. But what does that mean for all of those legacy drawings that you have from previous versions that are set to “Feet” because they had no other option back then? Unfortunately, as mentioned above, the answer is that unless that setting is changed, a conversion calculation will be performed and they will come in shifted from the correct location. The only known workaround at this point is to create a folder of your necessary XREF drawings, open each one in AutoCAD 2017 or later, change their Units to “US Survey Feet,” then save and close. Remember though, if you open and save these drawings in AutoCAD 2018 or later, the saved drawings will be in the new AutoCAD 2018 DWG format and will not be usable in previous versions without saving them back again.
For users of Civil 3D, the use of these two separate settings for “Feet” is an extremely important concept to understand. This is due to the fact that you are very often working in State Plane Coordinates in your drawing and/or your Survey Databases. It is important to note that establishing the “Drawing Settings” of a Civil 3D drawing and setting the coordinate system does not always automatically force the AutoCAD Units to be set to US Survey Feet, even though the units are clearly locked in on the “Units and Zone” tab of the “Drawing Settings” dialog, as shown below:
The key here is one of the check boxes that you see underneath of the “Imperial to Metric conversion” drop-down. If the “Set AutoCAD variables to match” box is checked, then setting the drawing to a coordinate system (ex. State Plane) that uses the US Survey Foot will automatically update the Insertion Units setting in the AutoCAD Units dialog to US Survey Feet. If this is not checked (which it is not by default in the Out-of-the-box templates), the Insertion Units in the AutoCAD Units dialog will not change, regardless of any of the selections made in this dialog.
Civil 3D Survey Databases and how they insert points into drawings will also be affected by this change. In Civil 3D 2016 and prior, if your Civil 3D Drawing settings were established as US Survey Feet and the drop-down in your AutoCAD Units dialog was set to “Feet,” then points inserted to the drawing from a Survey Database that was also set to US Survey Foot would come in correctly. That is no longer the case in Civil 3D 2017 and beyond. The AutoCAD units MUST be set to US Survey Feet. Otherwise, the database will think that your drawing is in International Feet, a conversion will be performed during the insert, and the Points and Figures will come in in the wrong location.
To avoid this issue, I have heard of many users switching their AutoCAD units to “Unitless.” Is this a good idea? Not really, for a variety of reasons. I discuss how the insertion of outside drawings such as Architectural buildings, details, blocks, etc. can be adversely affected by going with “Unitless” in a previous blog. For more information on this, see “Why can’t we all just get along?? – Helping Architects, Surveyors, and Engineers all play nice together in the AutoCAD sandbox.“
Yes! Because Recap and Infraworks both understand State Plane and other coordinate types, the difference between US Survey Feet and International Feet can also have a large effect on how data is created, inserted into, or exported from these programs as well! This is another reason why working with your AutoCAD units set to “Unitless” is not recommended and why careful attention should always be paid to the type of “Foot” in use and the necessary Coordinate Systems.
Based on my quick experimentation, it appears that inserting data from FDOs such as Shapefiles and SDF files are not affected by the difference between “Feet” and “US Survey Feet” in the AutoCAD Units dialog. Coordinate conversions performed by Map 3D are based on the Coordinate System set in the drawing by either the Map 3D or Civil 3D Drawing Settings.
Here are a few main points to keep in mind for working with US Survey Feet and International Feet in Autodesk products.
As a refresher, listed below are the steps to access each of these settings:
Good luck! And remember, Happy Units = Happy Sharing!!!
Contact us! Our CADD Care Certified Helpdesk provides you with direct access to a full-time staff of technical experts that will help you get your software questions answered quickly and accurately. You can email us at helpdesk@caddmicrosystems.com, or call 703.924.5310.
Marissa is the Practice Manager for Civil and Infrastructure at CADD Microsystems. Marissa graduated from Virginia Tech with Bachelor’s and Master’s degrees in Civil Engineering. She has been working with Autodesk products for almost 20 years, specializing in the Civil and GIS solutions. She has worked for a number of reputable civil firms in Virginia providing CAD support to transportation, utility, land development, mapping, and GIS projects. At CADD Microsystems, Marissa’s responsibilities include managing the Civil Team, performing product demonstrations, teaching classes, giving seminars and workshops, and performing consulting for many Autodesk products such as Civil 3D, Land Desktop, Map 3D and Raster Design.
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