2011

NOTE When you export from a map, only drawing objects are exported. Geospatial
features are ignored. To move geospatial feature data to another format, use
Migrating GIS Data (Bulk Copy) (page 617).
ESRI Arc/INFO stores coverages on your hard disk as a directory of files. The
main coverage directory, called the workspace, always includes one subdirectory
called INFO. Each coverage is written to its own subdirectory. If you do not
have a coverage workspace on your computer, AutoCAD Map 3D creates one
for you when you export to an ARC/INFO coverage.
Arc/INFO uses elevation values but they are stored in the coverage as a field
in the attribute table. Select the Elevation property to export elevation.
When exporting, the exported file is stored in memory before it is written to
the file. If you run into problems exporting a large drawing, increase the size
of your virtual memory.
PC coverages are single precision. UNIX coverages can be single or double
precision. AutoCAD Map 3D always exports double-precision coverages,
although it does import single- or double-precision coverages.
Map objects such as arcs, splines, and circles are segmented in the coverage.
You can change the settings used for segmentation by editing the mapimport.ini
file.
Exporting Restrictions
When specifying a coverage name, use fewer than 14 characters and do not
use periods in the name. If you use double-byte characters, you can use 6 or
fewer characters.
If you specify a directory name that already exists and it contains a log or text
file, those files may be overwritten.
Arc/INFO also supports a transfer format called E00 which writes all
information out to a single file, which can become quite large.
When exporting text or mtext to Arc/Info Coverages, the resulting objects in
the Coverage data are annotation. AutoCAD Map 3D does not support attribute
data for annotation. As a result any data linked to text objects will be lost
during the export process. The text value itself will be maintained.
1420 | Chapter 9 Publishing and Sharing Maps