Adjusting Class Size and Opacity

You can define class size to increase or decrease the data display resolution. For example, if you select a data attribute such as Depth and depth values range from 1-1,000, and you define a class size of 100, this results in 100 distinct data classes with the data distributed across these classes. If the data is evenly distributed in the data set, the class values start at 1-10, then 11-20 and so on through 991-1,000. If you define a class size of 10, the result is 10 distinct classes with values starting at 1-100 and continuing to 901-1,000. In situations where the data is not evenly distributed in the data set, the minimum and maximum values of each class will not be evenly distributed since these values are based on actual data values in the data set.

Smaller class sizes permit you to define more data display properties for the range of data you are displaying. Spatial Explorer distributes data values as evenly as possible across the number of classes you define. If the number of classes you define equals or exceeds the number of discrete data values, Spatial Explorer displays the discrete values instead of any data classes.

For horizons and grids, you can adjust the value range of individual classes by changing the end value of a class. Spatial Explorer automatically changes the start value of the next class if there is one. If you change the class size (number of classes) after adjusting the range of an individual class, Spatial Explorer replaces any custom values with calculated values.

In some cases, you can also adjust the opacity of a class. The default value is 100% opacity. Adjusting opacity allows you to emphasize specific ranges of values in horizons and grids. If you change the class size (number of classes) after adjusting opacity for a class, Spatial Explorer resets opacity for all classes to 100%.