create_cover_df: create cover data frame
In emchristensen/quadprocessing:

creates data frame of cover data from polygon data layer from gdb

1	create_cover_df(df, quad_info, desired_columns)

`df`	data frame of polygon data created by readOGR
`quad_info`	information about quadrat name and year gleaned from layer file name
`desired_columns`	vector of column names that should be extracted from the attribute table

returns a data frame with columns: quadrat, year, species_code, area, perimeter

emchristensen/quadprocessing documentation built on May 4, 2019, 4:15 a.m.

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