[R-sig-Geo] Spatial Correlogram

[Sadz A]

Dear list,

I am trying to explore spatial patterns in some density data that I have 
(attached txt- RDdensityChange). I have successfully carried out Moran's I 
correlogram on the data using the library (pgirmess). I now wish to carry out an 
anisotropic correlogram, I have looked at the ncf and ape packages but I am 
failing to get the out put I want: 

I would like to find the direction in which the change is occurring, how 
significant it is etc.  

To do this I believe I need to calculate the distance between points 
(municipXY.txt attached is the latitude longitude location of my data points) 
when they are projected onto a perpendicular line (of angle 0 ie. north line). 
use the distances calculated to to run a new morans I. And then repeat for a new 
angle (eg 45 degrees (North east), 90 degrees (east) etc). 

Unfortunately I don't know how to do this, I am very new to spatial analysis and 
R. 
I would greatly appreciate any help on this matter. 

Thank you for your time, 
S.
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