[R-sig-Geo] Chi-square test with spatial data

[Christof Bigler]

Hi

I have grid based, spatial data, and for each grid cell I have several 
variables (fire severity, elevation, vegetation etc.). I would like to 
know if there is e.g. lower fire severity above 3000 m a.s.l. as 
compared to below 3000 m.
Since the data are highly correlated, I wondered if it's possible to 
test the independence of two variables using chi-square tests. Is there 
any correction that could be used to correct the p values?

Thanks for your help!
Christof