![]() ![]() Additionally, he provided 6 years of engineering support at a municipal public works department. He is a California licensed Civil Engineer and LSIT with over 9 years land development design experience and 6 years Civil–GIS software consulting. homepage.ĭaniel is an Application Specialist for Infrastructure Solutions at the Ideate Sacramento office. Doing so will give you the visual prompt of the auto-scaling AutoCAD is about to perform.įor more information on the software solutions, training, and consulting Ideate provides, please visit the Ideate, Inc. Until then, I recommend setting the Drawing Units length precision to six decimal places for all drawings assigned US Survey Feet. Because it's old and undocumented, it does not include US Survey Feet.Īlthough it's great news that Autodesk finally added US Survey Feet to AutoCAD's supported units, we may not fully realize the benefit for a few more releases. It's occasionally used to address block insertion scaling of 12x or 1/12 even when INSUNITS is correct in both drawings. Lastly, some of you may be aware of an old undocumented AEC command called -DWGUNITS. An AutoCAD 2017 created drawing can still be opened by AutoCAD 2013-2016. You'll get the below warning upon changing the units. Note that the coordinates of the same point differ by -12.51, -4.07.Īlso note that 'US Survey Feet' is not understood by AutoCAD versions prior to 2017. In the below screen shot, I've externally referenced an Intl Foot drawing into a new 'US Survey Feet' drawing. It's negligible for low coordinate value drawings, but not for our state plane coordinate drawings. This is the ratio of Intl Feet to US Survey Feet, which comes to about 2 feet for every 1 million feet. Now, if you set your Drawing Units length precision to six decimal places, you'll see a scaling factor of 0.999998. The auto-scaling will not be obvious in the Attach External Reference dialog because the default Drawing Units length precision in most drawings is set to four decimal places. Remember that attaching an Xref is an AutoCAD based tool. This will also occur even if the referenced drawing is assigned a coordinate system based on US Survey Feet. Why do I say that?Įxternally referencing a ‘legacy’ engineering drawing (pre 2017), set to Intl Feet, into a 2017 'US Survey Feet' units drawing will now be automatically scaled, regardless of whether the application performing the reference is AutoCAD 2017, Map 3D 2017 or Civil 3D 2017. Now the sobering news… because 'US Survey Feet' is a new unit to AutoCAD (INSUNITS=21), potentially undesired automatic scaling of Xrefs will occur if we are not careful. Yet it makes a significant difference when you are working in large state plane coordinate values for mapping and civil engineering projects. The difference between a US Survey Foot (~0.3048006 meters) and an International Foot (0.3048 meters exactly) is quite small. ![]() AutoCAD tools to attach External References, insert blocks, and ReCap point clouds, auto-scale based on International Feet. The issue up until now, was that although Map 3D and Civil 3D functionality understood coordinate systems, and the difference between a US Survey Foot and an International Foot, underlying AutoCAD did not. US Survey Feet is preferred by California, Texas, Colorado, Connecticut, Maryland, Indiana, North Carolina, Nebraska, and Wyoming. It's been something we've wanted for years because many of us assign our drawings a State Plane Coordinate System (SPCS) using AutoCAD Map 3D or AutoCAD Civil 3D. Posted on Author: Daniel Armstrong AutoCAD 2017, AutoCAD Map 3D, AutoCAD Civil 3D, AutoCADĪs a Civil Engineer and Infrastructure Application Specialist at Ideate, I'm celebrating along with Surveyors, Mappers, and Civil Engineers in nine states… AutoCAD 2017 based products now support US Survey Feet! ![]()
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