Source: http://autodesk.blogs.com/between_the_lines/autocad-release-history.html

Source: http://www.gisuser.com/content/view/11991/53/

Source: http://www.esri.com/news/arcnews/winter0001articles/anewworld.html

Source: http://store.autodesk.com/store/adsk/en_US/buy/productID.226491200

Source: http://store.esri.com/esri/search.cfm?SID=2&

Source: http://map3d.wordpress.com/2010/08/09/a-history-class/

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GIS MilestonesTransition from CAD-based map to GIS-based map

1992-93 Release of ArcView – Affordable desktop GIS - point and click vs. command line – ease of use

1999 Release of ArcView 3.2 – enhanced CADReader extension, Projection utility

2001 ArcGIS Desktop 8.1 – ArcEditor option, improved CAD rendering, annotation, on-the-fly coordinate and datum projection, three application user interface.

CAD to ESRI Geodatabase

General process, considerations, tips & tricks

Document CAD data

• Thorough documentation is critical– List layers along with descriptions

• Are CAD attributes such as color and line type important?

– Layer forms polygon boundary?– Layer is no longer needed in GIS

environment?– Etc…

•Combine CAD layers into single feature classes

•Use geodatabase subtypes

Tools Used

• Mostly standard ArcGIS tools– Select Level from CAD Export selected

features to feature class– Copy/Paste– Import CAD Annotation

• CAD file needs a .prj file for this to work

• Data Interoperability extension– Great for automating repeated conversions

CAD lines for highway shields and other symbology are unneeded in the geodatabase

Example 1:

Example 2: Do not convert these lines. Use geodatabase annotation properties

Example 3: Do not convert these lines. Use geodatabase point feature

CAD lines that will form polygon feature classes need to be inspected closely for gaps

Example 1: PLSS lines Polygons

Mtext is a problem

Mtext does not convert to GDB

Exploded Mtext….

Converts to single GDB annotations

Fix misalignment of stacked lines with the Integrate tool

Gap

Double section lines

Integrate tool with .5 foot cluster tolerance will make these lines coincident.

Attribution techniques

•Buffer + Spatial Join

•Attribute Transfer Mapping (last resort)

•Spatial Join – point in poly

•Join PIN to database for subdivision attributes

Buffer + Spatial Join

Attribute Transfer Mapping

2 Spatial join methods

1) Count field shows number of points within poly

2) Poly receives attributes of closest point. Distance = 0 indicates the point is within the poly boundary.

Join for Count catches errors

Spatial join for attributes produces some erroneous attributes

Spatial join for attributes:distance > 0 indicates either non-

parcel polygons or errors.

Watch out for crazy stuff!!

Original CAD

Converted usingImport from CAD tool

Converted usingSelect Export

More crazy stuff • Workaround for Export to CAD bug w/ ellipse features

• DGN DWG GDB

The End