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. Press Esc when prompted for the insertion point if you do not want to insert a new block into the drawing.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! The drawing is regenerated, and the new definition is applied to all existing insertions of the block definition. If you choose to redefine the block, the existing block definition is replaced with the new block definition. ![]() = after the block name, the following prompt is displayed:īlock "current" already exists. ![]() Updating a Block Definition: If you make changes to a block file that is inserted in your drawing and you want to change the existing block definition without creating a new block insertion, enter the following at the Insertion Point prompt (following the Block Name prompt):.You can replace an existing block definition with an external file by entering Updating a block path: If you enter a block name without a path name, INSERT searches the current drawing data for an existing block definition by that name.The block definition is not added to the drawing. Preceding the name of the block with an asterisk (*) explodes the block and inserts the individual parts of it. You can control block insertion behavior using the following methods: In AutoCAD LT, you can list unnamed groups by selecting Include Unnamed Groups in the Group Manager.Įnter a tilde ( ~) to display the Select Drawing File dialog box (a standard file selection dialog box). In AutoCAD, you can list unnamed groups by selecting Unnamed Groups in the Object Grouping dialog box. Note: Grouped objects in an inserted drawing are inserted as unnamed groups.
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