Surfer's geoprocessing commands, including buffers, are available for base map objects only. To create buffers around points, they must be used to create a base from data map layer rather than a post map layer. Complete the steps below to create a base map from your data file, and add buffers to the desired points in the base layer.
- Create the base map.
- Click the Home | New Map | Base | Base from Data command.
- In the Open Data dialog, select your ASCII data file created above.
- Click Open.
- In the Base from XY Data dialog, choose the rows to plot in the Data Rows section, and verify that your X and Y columns are set appropriately in the Data Columns section.
- Click OK and the base map is created.
- Add a buffer.
- In the Contents window, select the Base layer.
- Click Features | Group | Start Editing.
- Select the desired point(s).
- Click the Features | New Features | Buffer command.
- In the Buffer dialog:
- Enter the Number of buffers to create. If you choose more than one, they'll be concentric with equal distances between them.
- Enter the Buffer distance in the same units that the map is in.
- Choose whether or not to combine overlapping buffer polygons. You might want to combine them if you select multiple roads or rivers, so that you get one polygon around them all instead of individual overlapping polygons.
- Click OK.
- Click OK.
- Click the Features | Group | Stop Editing command. Each buffer polygon is created as a separate polygon, as seen in the Contents window. You can adjust the properties of each polygon individually to change the line or fill colors. To adjust the buffer distance, recreate the buffer.
Updated November 8, 2018