The opacity of a map, image, text, line, fill, symbol, or entire layer can be customized in Surfer. Opacity is the amount of light that is obscured by an object. An object can be made semi-transparent by adjusting the opacity value. Reducing the opacity of an object makes other objects visible through the less than 100% opaque object. An Opacity value of 0% means that the object is invisible. An Opacity value of 100% means that the object is fully opaque. Setting the opacity is useful when creating a semi-transparent map layer. For example, you may want to display a semi-transparent contour map layer over a satellite image base map layer so that both map layers can be seen. Being able to set the Opacity of entire layers is especially useful when you have multiple layers with filled objects and you need to see all of the layers.
First, we will create a filled contour map:
Click the File | New | Plot command or click the button on the quick access toolbar. A new empty plot window is displayed.
Click the Home | New Map | Contour command.
Select the grid file Golden.grd from the list of files in the Open Grid dialog. By default, the Samples folder is located in C:\Program Files\Golden Software\Surfer 15.
Click Open. The map is created using the default settings. Some settings are persistent while Surfer is open. If you have completed Lesson 3 in the same session, the map created in this step will have uphill hachures and white-text contour labels.
Click on the contour map layer to select it.
In the Properties window, click on the Levels tab.
Set the Level method to Simple, if it is not already Simple.
Click the next to Filled Contours to open the Filled Contours section, if it is not already open.
Check the box next to Fill contours to fill the contours.
Click the next to Labels to open the Labels section, if it is not already open.
Click the next to Font properties to open the Font properties section.
If the Foreground color is not Black, click the current color and select Black from the color palette.
Back to Lesson 7 - Adding a Surface Map Layer
Next to Adding Transparency to Map Layers