Yes, if you have just XY data, you can still create a contour map in Surfer. Since you have to specify a Z value when gridding the data, you can use either the X or Y data as the Z column. Whichever column you use doesn’t matter because when creating a density grid the Z value isn’t used anyway. For example:
- Click Home | Grid Data | Grid Data.
- Select the XY data file and click Open.
- In the Grid Data dialog:
- Set the X and Y columns.
- Set the Z column to either the X or the Y column (it doesn’t matter).
- Change the Gridding Method to Data Metrics.
- Click the Advanced Options button.
- In the Data Metrics Advanced Options dialog, on the General page, select Data Location Statistics | Approximate Density.
- Click the Search tab and you may consider changing the radius of the search ellipse (this defines the area to look for points to calculate the density).
- Click OK.
- Change any other gridding parameter you want.
- Click OK and the density grid is created.
- Then you can create the contour plot by clicking Home | New Map | New | Contour, selecting the grid file and clicking Open.
Create heat maps in Surfer depicting the number of occurrences in a given area.
See also our knowledge base article: Create Heat (or Density) Maps in Surfer
Updated January 31, 2017