indiana university migrating from autocad to a geodatabase theresa thompson [email protected]
TRANSCRIPT
Total enrollment 2004-05 (7 campuses):
92,070 students
15,831 faculty and staff
714 buildings (7 campuses)
26,525,251 gross sq. feet of building space
2,963 acres
For the Bloomington campus
13 Utility SystemsChilled Water, Condensate, Communications,Electric, Exterior Lighting, Irrigation, Natural Gas, Sewer, Steam, Storm Water, Tunnel, Telephone, Water
Basemap
Indiana UniversityIndiana University
Utility Information GroupUtility Information Group
AutoCAD Map linked to Access via object data
GIS database
Database forms
Why move from AutoCAD Mapto a SDE Geodatabase environment?
Ease-of-Use for Editors Centralized Database/Graphics Environment Enterprise level data sharing Easier to bring CAD into ArcGIS than GIS into
CAD without conversion
IU GIS system• Windows based ArcGIS 9.1 – editors
Windows ArcReader 9.1 - viewersUnix ArcSDE/Oracle for geodatabaseUnix ArcIMS for web mappingTesting ArcGIS Server
Geodatabase – IU BloomingtonData Layers = over 58 basemap
over 100 utilities
Data Preparation for moving from AutoCAD Map to a Geodatabase
Database model in placecreate a geodatabase and set up boundary polygon for spatial reference
data naming/object/relationship standards for featuresdomain tables (lookup tables)
Clean your CAD and Attribute data before you convertobjects on correct layers / CAD Standardscorrect blocks / object linking
Expect data problems: there is no “perfect conversion”
http://downloads.esri.com/support/whitepapers/ao_/CAD_Translation_in_Geoprocessing_1004_J9324.pdf
Read this!
Approaches to converting CAD
CAD with no data linking but with block attributes– use Direct Read CAD file export into geodatabase (via ArcCatalog / ArcToolbox)
CAD linked to database/object data – use AutoCAD Map export to shapefiles or coverage, then load into SDE/Oracle
CAD annotation – use ArcToolbox \ Conversion Tools \To Geodatabase \ Import CAD Annotation
CAD text or blocks linked to polygons – use ArcToolbox\ CAD Translation \ PolygonsfromCADLinesandPoints
Simple CAD with no data linking but with block
attributes
Use Direct Read CAD file export into geodatabase (via ArcCatalog)
“The direct read functionality treats the CAD file
as a database of spatial features”
CAD files are rich in attribute data – don’t lose this during conversion
Filter out certain
CAD blocks
Rename field
names
Lists all the block names
in the dwg
“Text_” field = blockname
Attribute fields in feature class have new field
names
CAD linked to database/object data – use AutoCAD Map export to shapefiles
or coverage, then load into SDE/Oracle
There are currently no ESRI tools out there
to bring in database linked attributes via object
data or link templates in AutoCAD Map
AutoCAD Map 2006 has direct read capability to SDE/Oracle
Narrow what you convert in AutoCAD Map
by a query
Make sure your data source is connected and
the link templates you need are
active
For complex closed polylines you might need to convert to a coverage first, then geodatabase or shapefile
Select both drawing property attributes and
link template attributes to migrate over.
Here is your chance to
change the Output Field
Names
AutoCAD dwg property attributes and linked database attributes are now part of the
converted feature class.
Create a new personal geodatabase or new feature layers in SDE to import your
shapefile data into
Here is another chance to
change the field names or
decide not to bring in some attribute fields
your geodatabase
You can do similar functions several
ways...this time you use the Export to
Geodatabase command.
CAD annotation – use ArcToolbox \
Conversion Tools \ to Geodatabase \
Import CAD Annotation
Finally! A great tool for converting AutoCAD
Text into geodatabase annotation.
Preview AutoCAD
text to make sure it isn’t
mtext
You need to explode all mtext
for conversion. Set up a selection filter
for only mtext, then explode this.
Once you explode the mtext, save the dwg and
preview again in ArcCatalog
Be sure to select the dwg file annotation class for
conversion
You need to determine a
reference scale. We use 1:5000 for our
campus maps based on units of
feet.
This is how the converted CAD
annotation looks in the geodatabase
annotation feature class
You will be able to edit geodatabase annotation easily in a ArcGIS edit session with Annotation edit tools
CAD text or blocks linked to polygons
– use ArcToolbox\ CAD Translation \
PolygonsfromCADLinesandPoints
There are several powerful geoprocessing
tools/scripts in the CAD Translation toolbox.
Download this free
ArcToolbox
Notice the parcel number is just
text, not a block attribute.
We have filtered out just the parcel number layer to pull as an attribute for the
parcel polygons
Parcel polygons now have the
enclosed text from the CAD dwg as a
parcel attribute
Approaches to exporting from GIS to CAD
Set up a CAD template .dwg (with preinserted blocks, layers, linetypes)
Create geodatabase fields for CAD mapping like LAYER, ROTATION, LINETYPE, CADTYPE, REFNAME
For conversion to CAD – use ArcToolbox \ Conversion Tools \ Export to Geodatabase \ Export to CAD
Select all the Chilled
Water feature
classes to export into one CAD
file
Exported from SDE – this CAD file now has mapped blocks and attributes, layers and
linetypes automatically from the CAD template file (seed file)
For mapping geodatabase attributes back to CAD you need to make sure you have fields for
CADtype = insert
and the
REFNAME = blockname
In an ArcGIS edit session – use the Field Calculator to
populate the REFNAME with the
correct CAD blockname
2 new geodatabase fields you created to
export to CAD
Create a AutoCAD template file – make it
read-only
Point feature class in SDE is exported to new CAD file and block attributes automatically
populated to block inserts.
Note: open up newly created dwg in AutoCAD first, zoom extents and save before viewing in ArcCatalog.
