Visualize negative/positive data using levelplot in R

Question

I need your insights on how to visualize/map data that span negative and positive values. I have 6 rasters which have been stacked together (s) and will subsequentl

Answer 1

In my opinion, you have two choices:

1. Use a different key for each graph.
2. Rescale the data to create a common scale.

Because you need a single colorkey you should rescale the data. Although this document is about time series, it gives good advices about this issue.