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Lesson 7: Use Object Classes When Exporting
When you export to a spatial data format, such as Autodesk SDF, Oracle, or
SHP, you create feature classes. Feature classes are like object classes: they have
properties that represent the geometry of objects, as well as properties that
represent attribute data. Some database spatial data formats support multiple
feature classes within a single file. These formats include Oracle, SQL Server,
and some file-based data formats, such as Autodesk SDF. Some formats (for
example, SHP) store only a single feature class in each file.
If you have classified objects in your drawing, you can use the object classes
as the basis for the new feature classes. In this lesson, you export the object
classes in your drawing to multiple feature classes in a single Autodesk SDF
file. You then connect to that file in a new drawing to see how the resulting
feature classes appear in a map.
Exercise 1: Export object classes to SDF
In this exercise, you export the object classes in your drawing to multiple
feature classes in a single Autodesk SDF file.
NOTE
This exercise uses the map you created in
Exercise 1: Create objects using
object classes
(page 159).
To export to an Autodesk SDF file using object classes
1
If the ObjectClass.dwg file you created previously is not still open, open
it.
2
Click Output tab
➤
Map Data Transfer panel
➤
As SDF.
3
In the Export Location dialog box, do the following:
■
Make sure that Files Of Type is set to Autodesk SDF (*.sdf).
■
Navigate to the folder where you copied the tutorial data.
■
For the file name, enter Roads_Parcels_Signals.sdf.
■
Click OK.
4
In the Export dialog box, under Filter Selection, click Select Object Classes.
168 | Chapter 4 Tutorial: Classifying Drawing Objects
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