2011

DescriptionOption
select Sub or Master, the UORs in the DGN 7 file are conver-
ted to Sub or Master units according to the conversion factor
in the DGN file header.
When you import the file, one Master or Sub unit (whichever
you choose) will become one drawing unit in your AutoCAD
Map 3D map. The Unit Ratio value indicates the ratio between
the Master and Sub units. For example, if the ratio is 1:12 (as
it would be for Feet/Inches), imported object coordinates will
be scaled 12 times bigger if you select Sub.
NOTE When you import or export a DGN file with a master
unit of Imperial feet, AutoCAD Map 3D converts the master
unit from feet to meters. In addition, it does not recognize
any subunit selection during the import or export process.
Select the options to use during import. For example, select
Explode Complex Strings to return each component of a
Element Expansion
complex chain as its own feature (no feature will be returned
for the complex chain as a whole). Otherwise, all elements
of the complex chain merge into a single linear feature, any
arcs in the complex chain become linestrings, and any link-
ages on the component elements themselves are lost. Select
Propagate Member Linkages to return the linkages attached
to the first component of the complex chain to supplement
any existing linkages. Otherwise, any linkages on the compon-
ent elements themselves are lost and only linkages attached
to the complex chain itself are returned.
By default, cells are converted into blocks, maintaining the
cell grouping. You can choose to convert the cells to points
Cell Expansion
instead. You can also explode the contents of the cells into
their component parts, but the explosion is one level deep
only.
Select Create DWG to read all external reference files (xrefs)
attached to the source data set. If the reference file has nested
Reference Files
references, they are also imported, but circular references are
not. If you select this option, you specify a location for the
folder for these files. If the folder already exists, you can
choose to replace it (overwrite its contents) or cancel and
specify a different location. The default folder location is the
same as the selected DGN file location.
406 | Chapter 3 Bringing In Data