Hello,

I want to give census tracts categories values ( layer tenn_county_all) based 
on there centroids location in a grid layer that I have made 
(tenn_county_grid). The grid is nubered 1-42 and also as letters i.e. row A 
colunm G. 
 I was planning to do something like

if centroid of tract X in grid box 12 write out category 12 for that tract X.  

I don't want to do this by hand but I am not sure how or if I can query between 
two layers. 

I am not attached to any particular method just need something that will do the 
job. 

I looked up info on the web and found bounding box in v.edit so I think that is 
a way to go but have not seen anything on how to do this. 

Thanks,

Matthew

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