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| How do I create a BLN file to display multiple polylines? |
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To create a BLN file to display multiple polylines, there are two options.
- Digitize from Surfer.
- This is best to create line segments from an existing map in Surfer (contour, base, etc.). When creating a blanking file in this manner the header information is added to
the file automatically.
- To create a blanking file with the Digitize command:
- Create a map in the plot
window, and then select the map. This can be an overlay, although the overlay
cannot contain a wireframe or surface, or be tilted at any angle other than 90
degrees.
- Choose the Map | Digitize command and the pointer becomes
a cross hair.
- Click the left mouse button
in the plot window to write the current coordinates to the digitize editor
window (digit.bln dialog box).
- If you wish to create
multiple polylines, click the digitize editor window and manually insert a blank
line between the coordinates that make up each polyline. Each group of
contiguous coordinates will form a separate polyline in the blanking file.
- When you are finished
defining the polyline(s), select the File | Save As
command in the digitize editor window, and save the file using a [.BLN]
extension. Press ESC or choose any tool button to exit digitize mode.
- Create Manually in a text editor.
- This method is best if you have known X,Y values for your line segments.
- To create a blanking file with a text editor, ensure that the format includes header information and save as a .BLN file.
- Below is an example of the proper format for 4 seperate polylines. The header consists of the (number of points, blanking flag value)
2,1
-170.036813503, 41.2459673979
-157.773313416, 57.8892889456
2,1
-103.171471766, 40.3700031059
-81.5643300805, 51.7575389017
2,1
-106.091352739, 26.0625638538
-120.398791991, 44.1658483712
2,1
-119.230839602, 35.9901591629
-155.729396734, 19.9308138099
Note: You can view your BLN file in Surfer using the Map | Base Map command.
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