BG-Map Basemap Editing Tip

How to Break Out a Portion of Your Basemap

Updated 5/22/02

This document describes how to break out a portion of your basemap and place it into a separate file.

Sometimes, you may wish to break out just a small section of your basemap to send to an architect or designer. Here’s how:

1. Turn Off the GRID layer.

2. Draw a closed polyline around the area that you wish to include.

3. At the command line, type TRIM <Enter>

4. AutoCAD will prompt - "Select Cutting Edges Select Objects" Click on the closed polyline, and hit <Enter>

5. AutoCAD will prompt - "Select object to trim or shift-select to extend or [Project/Edge/Undo]:" Going around the closed polyline, one by one, click on each line that passes through the polyline, causing it to be trimmed at the polyline boundary. If you make a mistake, type U <Enter>, and the last trim will be undone. When finished, hit <Enter>

6. At the Command prompt, type -WBLOCK <Enter>

7. Select a filename to use for the drawing that you will be sending to the designer.

8. AutoCAD will prompt: "Enter name of existing block or [= (block=output file)/* (whole drawing)] <define new drawing>:" Hit <Enter>

9. AutoCAD will prompt: "Specify insertion base point:" Type 0,0 <Enter>

10. AutoCAD will prompt: "Select objects:" Select all of the objects inside the closed polyline, and then hit "<Enter>". All the objects will be written to the new file.

11. DO NOT SAVE THE BASEMAP! Instead, close BG-Map, and re-open it. You basemap should be restored to its original condition.