build_change_table.RdBuild Cover Change Table
build_change_table(csv, year1, year2, polys, lots, permits)
| csv | is a csv file with cols(id, year, type, obs(1:50))  | 
    
|---|---|
| year1 | is a number matching a value in csv$year  | 
    
| year2 | is a number matching a value in csv$year  | 
    
| polys | is a spatial polygons object (sampling boxes)  | 
    
| lots | is a spatial polygons object (riparian taxlots)  | 
    
| permits | is a csv file with cols(maptaxlot, record_no)  | 
    
prints a csv file with cols(id, change, maptaxlot, permits) to the working directory