# Reading M3 Files

## Documentation for package ‘M3’ version 0.4

- DESCRIPTION file.
- Package NEWS.

## Help Pages

M3-package | Functions to read in and manipulate air quality model output from files in Models3 format
combine.date.and.time | Combine date and time to obtain date-time in POSIX format
decipher.M3.date | Decipher Models3 date format (YYYYDDD) into R's Date class.
decipher.M3.time | Decipher Models3 time format (HHMMSS) into hours, minutes, and seconds.
get.canusamex.bds | Obtain map boundaries for Canada, USA, and Mexico
get.coord.for.dimension | Get the grid coordinates for the grid rows or columns.
get.datetime.seq | Read in a sequence of date-time steps from a Models3-formatted file.
get.grid.info.M3 | Get information about the grid used by the air quality model
get.M3.var | Read in variable values from Models3-formatted files
get.map.lines.M3.proj | Get map lines in the model projection units
get.matrix.all.grid.cell.ctrs | Obtain a matrix giving the locations of the grid cell centers
get.proj.info.M3 | Obtain information about the projection used in the Models3 file
M3 | Functions to read in and manipulate air quality model output from files in Models3 format
project.lonlat.to.M3 | Project coordinates from longitude/latitude to model units.
project.M3.1.to.M3.2 | Project coordinates based on projection in the first file to the projection given in the second
project.M3.to.lonlat | Project coordinates from model units to longitude/latitude
var.subset | Subset the array resulting from a call to 'get.M3.var'.