You can query objects
from one drawing into another drawing of the same geographical area,
even if the drawings use different coordinate systems. The queried
objects are automatically converted to the assigned coordinate system.
If a drawing does not use a known coordinate system, align the objects to
the map manually.
In this exercise, you
georeference drawing objects by adding them to a map with a known
In practice, you can
obtain such a map from the local county or municipality. For example,
for a drawing of city parcels, obtain a digital version of an assessor
map of that city. Make sure that you know the coordinate system used
to create that map. We refer to this map as the “target map.” In
this example, you connect to an SDF data store containing parcel
You use the Rubber
Sheet command to align the drawing objects with known
locations in the target map.
To georeference drawing objects
- Create a drawing and assign a coordinate
- Click New Drawing.
Select the map2d.dwt template
and click Open.
- Assign a coordinate system. Switch to Map
Explorer in the Task Pane. Right-click Current
Drawing and click Coordinate System.
Enter CA-I and click OK.
- Connect to a parcel data store of the
same geographical area.
In this example, connect
to the tutorial sample file PARCELS.SDF,
which uses the coordinate system CA-I.
- Click Data Connect
- Under Data Connections By
Provider, select Add SDF Connection.
- Click the file icon next to Source
- Navigate to the folder where you copied
the sample files and select PARCELS.SDF.
- Click Connect to
add the parcel data file as a data source.
- Under Add Data To Map,
- Click Add To Map.
- Open the drawing containing your drawing
In this example, open
the sample tutorial drawing subdivision_block.dwg, which
has no coordinate system.
- In the subdivision_block.dwg drawing,
select and copy the objects to align.
The objects in subdivision_block.dwg are defined
as a block.
- Click anywhere on the block perimeter
to select all the objects.
- In the target map, paste the objects
into the blank area in the center of the drawing.
- Switch the current window to the parcels
drawing you created.
- Zoom into the large empty area in the
center of the drawing.
- In the empty area, right-click and select Paste.
- Click an insertion point for the block.
Paste the subdivision
block in the empty space. Find the parcel to which the subdivision
aligns. In this illustration, the parcel is red (but it is not red
in the sample file).
- Find the points that the target map and
the drawing objects have in common.
For example, if your
drawing represents new parcels, find the development that contains
those parcels. Find at least two common points.
In the parcels drawing
you created, the parcel you want is to the left of the empty area.
In the illustration above, it is red.
- Use the Rubber Sheet command
to align your drawing objects with the known objects in the map.
Where you are now
You created a drive alias
for drawings stored on a shared drive. You georeferenced drawing
objects, using the Rubber Sheet command to align
them with known locations.
To continue this tutorial,
go to Lesson 2: Clean Up Your Drawings.