Guides

How to get a parcel boundary into AutoCAD or Civil 3D

Download the parcel polygon from your state or county GIS (as a shapefile or GeoJSON), reproject it to your State Plane zone in feet, then import it: Civil 3D and Map 3D read shapefiles directly with MAPIMPORT; plain AutoCAD needs a DXF, which QGIS can export. Set the drawing units to match the zone's foot (US survey or international).

1. Get the parcel

About 30 states publish a free statewide parcel layer; elsewhere it's the county assessor or GIS department. Start with free parcel data by state. Most are ArcGIS REST services you can add to QGIS or ArcGIS Pro and export from.

2. Put it in State Plane feet

Parcel services usually serve Web Mercator or latitude/longitude. In QGIS, use Export > Save Features As and set the CRS to your county's State Plane zone in feet (for example NAD83 / Washington South (ftUS)). Whether the zone uses US survey feet or international feet depends on the state; the difference is about 2 ft per million, which shows up at State Plane coordinates.

3. Import

• Civil 3D or Map 3D: run MAPIMPORT, choose the shapefile, and assign the coordinate system (MAPCSASSIGN) so it matches.
• Plain AutoCAD: AutoCAD can't read shapefiles, so export a DXF from QGIS (Save Features As > DXF) and INSERT or open it. Coordinates come through as-is.

Traps

• Importing latitude/longitude by mistake gives a parcel a fraction of a unit wide near 0,0.
• Drawing units left as inches or meters. Set UNITS to the matching foot before anything else.
• Using the line as the property boundary. Assessor lines are for taxes and can be 5 to 50 ft off; see parcel lines vs legal boundaries.

Everything here is planning-level public data. Confirm boundaries, topography, wetlands and flood status with a licensed surveyor and the right specialists before design decisions depend on them.

Related

• Assessor parcel lines vs legal boundaries
• How to make a site base plan from an address
• How to get real topography into SketchUp

Updated October 2026.