Fragstats - IJI with less than 3 cover types

Discussion created by alaeecology on Mar 12, 2018

I have been calculating Interspersion and Juxtaposition Index values on raster maps of wetlands. IJI, however, cannot compute a value when there is less than three cover types (patch types) because of the nature of its calculation… 

Because we are working with wetlands, we are primarily interested in the interspersion of open water and emergent vegetation. Has anyone also encountered this problem or know of a way of calculating IJI with less than 3 patch types?