Georeferencing CAD data ArcGIS

August 27, 2008






We worked with a CAD dataset fo the AB-Tech campus that was not in real world coordinates. To set the coordinates for the data frame, as the first layer, we added campus buildings layer (this layer is 'defined' as State Plane NAD 83 feet - therefore the data frame will be defined as SP NAD 83 Feet).

1. first layer added to data frame defines coordinate system, campus buildings (CS = NC State Plane NAD83 feet)


2. open CAD file ABTmap_full.dwg(CS = not real world)


3. turn on Georeferencing toolbar


4. Zoom to campus buildings layer


5. Make sure CAD polyline layer is selected in georeferencing toolbar


6. Georeferencing ==> 'Fit to Display'


7. two point transformation on CAD layer


8. select from CAD polyline layer using field "Layer" for valeu "BUILDING"


9. Export selected data using coordinate system of data frame, to a geodatabase


10. Repeat export to create layers for

• utility poles (also from points layer)


• Roads paved
  
• Roads unpaved
  
• Sidewalks

The CAD data is organized by attributes related to graphic display.