Alex LeReaux

Recent Posts

ArcGIS for AutoCAD 300 SP1

ArcGIS for AutoCADA new update for ArcGIS for AutoCAD 300 is now available. ArcGIS for AutoCAD 300 SP1 adds support for AutoCAD 2013 and includes enhancements and bug fixes.

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ArcGIS for AutoCAD Build 250 64-bit patch now available

An ArcGIS for AutoCAD Build 250 patch for 64-bit platforms has been released. This patch enables 64-bit AutoCAD applications to edit feature class attributes using the AutoCAD properties palette.

We recommend that all ArcGIS for AutoCAD 64-bit users install the patch at your earliest opportunity.

If you are running a 32-bit installation of AutoCAD Civil 3D 2010 on a 64-bit Windows operation system, reference Knowledge Base article 38453.

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What’s new in ArcGIS for AutoCAD Build 250


ArcGIS for AutoCAD Build 250 was released this week, and is now available for download. It can be installed on 32-bit or 64-bit versions of the following AutoCAD-based products by Autodesk:

  • AutoCAD 2010/2011
  • AutoCAD  Map 3D 2010/2011
  • AutoCAD Civil 3D 210/2011

For a complete list of requirements, see System Requirements.

Here are a few highlights of what’s new in this release. For a complete listing see What’s New in ArcGIS for AutoCAD Build  250. Continue reading

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Importing CAD Annotation

A common question the CAD team receives is how to preserve the original text height when importing a CAD annotation feature layer, or, if it has already been converted, how to scale it back to its intended size.

Define a Coordinate System

The best practice is to define a coordinate system for the CAD dataset before adding it to your map and before importing the annotation. More importantly, it needs to be a projected coordinate system with a unit of measure that matches the unit of measure the CAD file was created in.

Spatial Reference dialog box

Defining a projected coordinate system is important for two reasons:

First, if you don’t define a coordinate system, the tool has no other recourse than to use its own default unit of measure, which is meters. If the source CAD drawing was created in meters, this is not a problem. But if the drawing was created in units other than meters, such as U.S. Survey feet, your text will convert to a size that is likely to be unusable.

Unusable imported CAD annotation
Second, the Import CAD Annotation tool only references the coordinate system defined with the dataset, not the data frame. Therefore, you must define a coordinate system in a Catalog window before adding it to ArcMap if you want the tool to recognize one.

Convert to Geodatabase Annotation 

After you’ve assigned a correct coordinate system and added the CAD data to your map, right-click the CAD annotation feature layer in the table of contents and click Convert to Geodatabase Annotation.

Convert to geodatabase annotation
Run the Import CAD Annotation tool accepting the default parameters. When it has completed executing, the annotation will be added to your map.

Usable imported CAD annotation

Recalculate the FontSize Field

If instead, you no longer have access to the CAD file, but you know the unit of measure it was created with, then it is a simple matter of rescaling the font size with a conversion factor.

A common misconception at this point in the workflow is the idea that changing the annotation’s reference scale will correct the problem. Although useful in its own right, a reference scale is only a display scale, meaning it is the scale at which the annotation will display at its defined size. In this case, it does not correct the results that were caused by an undefined unit of measure in the input CAD dataset.

The solution to the problem is to scale the values in the FontSize field with the Field Calculator using the correct conversion factor. 

Open the attribute table, right-click the FontSize field heading, and open the Field Calculator.

Attribute table

For the sake of this discussion, let’s assume the CAD file was created in U.S. Survey feet. In this case, multiply all values by the conversion factor 1200/3937.

Field Calculator
One last note: If you’ve followed these instructions and the annotation is still displaying incorrectly in ArcMap, check the data frame’s units setting and verify that it also matches the units that your conversion factor calculated for.


In summary, if you need to import CAD annotation, you should always define a coordinate system before converting the data. The units should match the CAD file’s unit of measure. Defining a coordinate system defines a unit of measure that the Import CAD Annotation tool will use to calculate font size. If you don’t define a coordinate system, the tool will calculate one unit per meter. If you no longer have access to the CAD file, but you know the unit of measure, you can resize the font by applying a conversion factor to the FontSize field using the Field Calculator.

Contributed by Alex LeReaux of the CAD development team

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Importing CAD data in ArcGIS Desktop 10

In ArcGIS Desktop 10 you can now import CAD data directly from ArcMap. Best practice CAD conversion tools can be opened directly from the shortcut menu when you right click a CAD feature layer in the table of contents.  These tools open already populated with the selected input feature layer and output to your default geodatabase. Clicking OK runs the tool and adds the output to your map.

  • Convert CAD Feature Layer opens the Copy Features tool.
  • Convert CAD Feature Dataset opens the CAD To Geodatabase tool.
  • Convert to Geodatabase Annotation opens the Import CAD Annotation tool.

CAD To Geodatabase

The shortcut menu includes a new tool for importing CAD datasets. The CAD To Geodatabase tool imports all feature classes contained in the CAD dataset for the selected feature layer and converts it to a geodatabase dataset. Processing includes the dataset’s annotation using preset parameters.

Using this tool, you can also add multiple CAD datasets as input including mixed DWG and DGN formats. When you import more than one CAD dataset, the tool merges duplicate feature class types and their attributes, and applies the first coordinate system in the list to the new dataset. This tool replaces the Import From CAD tool.


ArcGIS Desktop 10 simplifies importing CAD data. The new shortcut menu provides easy access to best practice CAD conversion tools without having to know them by name. You simply click on the task you need to perform and the right tool opens ready to run. The new tool CAD to Geodatabase simplifies converting entire CAD datasets by incorporating several best practice tools into one easy tool.

Contributed by Alex LeReaux of the CAD development team

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