Package 'openair'

openair-package 3windRose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141Index 146openair-packageTools for the analysis of air pollution dataDescriptionDetailsThis is a UK Natural Environment Research Council (NERC) funded knowledge exchange projectthat aims to make available innovative analysis tools for air pollution data; with additional supportfrom Defra. The tools have generally been developed to analyse data of hourly resolution (or at leasta regular time series) both for air pollution monitoring and dispersion modelling. The availabilityof meteorological data at the same time resolution greatly enhances the capabilities of these tools.The project code is also developed using R-Forge (http://r-forge.r-project.org/projects/openair/).Package: openairType: PackageVersion: 0.4-15Date: 2011-04-12License: GPLLazyLoad: yesopenair contains collection of functions to analyse air pollution data. Typically it is expected thatdata are hourly means, although most functions consider other time periods. The principal aim tomake available analysis techniques that most users of air quality data and model output would notnormally have access to. The functions consist of those developed by the authors and a growingnumber from other researchers.The package has a number of requirements for input data and these are discussed in the manual(available on the openair website). The key requirements are that a date or date-time field musthave the name ‘date’ (and can be Date or POSIXct format), that wind speed is represented as ‘ws’and that wind direction is ‘wd’.Most functions work in a very straightforward way, but offer many options for finer control andperhaps more in-depth analysis.The openair package depends on several other packages written by other people to function properly.To ensure that these other packages are available, they need to be installed, and this requires aconnection to the internet. Other packages required come with the R base system. If there areproblems with the automatic download of these packages, see http://www.openair-project.orgfor more details.NOTE: openair assumes that data are not expressed in local time where ’Daylight Saving Time’ is