is a native Autodesk file-based geospatial format that is optimized
for storing large, classified data sets.
SDF is similar to SHP
format in that it contains both spatial data and attribute data.
However, unlike SHP, it stores both types of data in a single file
rather than a set of files.
drawing data is stored as SDF, you can use Autodesk MapGuide Enterprise
2007 to style and publish the data to the Internet. You can also publish
map data directly to MapGuide, without
exporting to SDF.
The current version,
which works with AutoCAD Map 3D and Autodesk MapGuide Enterprise, is
SDF version 3. AutoCAD Map 3D refers to this version as “SDF.”
SDF version 2 is still
supported by MapGuide 6.5 (and earlier releases), and AutoCAD Map 3D can
import and export SDF 2 using a separate import/export interface.
SDF has the following
advantages over DWG:
- It stores and manages an order of magnitude
more data than DWG
- It is very fast, allowing Autodesk applications,
such as AutoCAD Map 3D and MapGuide, to read and display tens of thousands
of features per second.
- It provides the power of a database without
the overhead and cost of a full relational database management system
(RDBMS) such as SQL Server or Oracle.
- An SDF file can store a single feature
class, or it can store multiple feature classes.
- It is easy to manage, providing access
to the database schema.
When importing SDF, you
can import each feature class in the SDF to a separate layer. You
can specify how you want to bring in attribute data and points.
You can also set an option to import polygons as closed polylines.
SDF has no import driver