[R-sig-Geo] summarize cells of different value intervals in a raster file by items in ESRI shapefile

[Robert Hijmans]

> I have a raster file (cell value varies from 0 to 1) and a ESRI 
> shapefile (there are countries, and provinces inside each countries), 
> the two files overlapped in the same region. I want to summarized the 
> cells (with different value intervals, say 0.0-0.25, 0.25-0.5, 
> 0.5-0.75, 0.75-0.1) by countries and provinces in countries. This 
> means I want to output how many cells of (0.0-0.25, et al.) in each 
> country and each province. 

Jianfeng, you can have a look at the polygon example for the extract
function in raster. Robert

library(raster)
?extract 


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