[R-sig-Geo] To extract coordinates and NDVI value for each pixel

[Komine]

Hi, 
I want to do  maps of changes for NDVI for several days. When I use a map 1
for day 1, map 2 for day 2, map 3 for day 3 etc… in a same page, differences
between maps were not visible.  For this reason, I want to do  maps of
changes using differences between pixels value (or NDVI value) . Thus I want
to extract coordinates and NDVI value for each pixel of my image (the image
covers all a country). However, I have not all the pixel coordinates, but I
have the coordinates of the image.  
Please how to extract coordinates and NDVI value for each pixel of my image
when I don’t know the coordinates of all pixels. I use R. 
Sorry for my bad English.
Thank you in advance
 
Komine 


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