| RNCEP-package | This package of functions retrieves, organizes, and visualizes weather data from either the NCEP/NCAR Reanalysis or NCEP/DOE Reanalysis II datasets | 
| gull | GPS data points from a lesser black-backed gull | 
| NCEP.aggregate | Temporally Aggregate Weather Data | 
| NCEP.Airspeed | Calculate flow-assistance according to equation 'Airspeed' | 
| NCEP.array2df | Convert data from an array to a data frame | 
| NCEP.bind | Bind Two 3-D Arrays of Weather Data Along the Prime Meridian | 
| NCEP.flight | Simulate Trajectories | 
| NCEP.FlowSpeed | Calculate flow-assistance according to equation 'FlowSpeed' | 
| NCEP.gather | Queries Weather Data | 
| NCEP.gather.gaussian | Queries Weather Data | 
| NCEP.gather.pressure | Queries Weather Data | 
| NCEP.gather.surface | Queries Weather Data | 
| NCEP.Groundspeed | Calculate flow-assistance according to equation 'Groundspeed' | 
| NCEP.interp | Interpolates Weather Data to a point in space and time | 
| NCEP.interp.gaussian | Interpolates Weather Data to a point in space and time | 
| NCEP.interp.pressure | Interpolates Weather Data to a point in space and time | 
| NCEP.interp.surface | Interpolates Weather Data to a point in space and time | 
| NCEP.loxodrome | Calculate the loxodrome angle between two points on Earth. | 
| NCEP.M.Groundspeed | Calculate flow-assistance according to equation 'M.Groundspeed' | 
| NCEP.NegFlowSpeed | Calculate flow-assistance according to equation 'NegFlowSpeed' | 
| NCEP.PartialSpeed | Calculate flow-assistance according to equation 'PartialSpeed' | 
| NCEP.restrict | Temporally Filters Weather Data | 
| NCEP.Tailwind | Calculate flow-assistance according to equation 'Tailwind' | 
| NCEP.track2kml | Plot a track in Google Earth | 
| NCEP.uv.revert | Reverts speed and direction to U and V components. | 
| NCEP.vis.area | Visualize Weather Data on a Map | 
| NCEP.vis.points | Visualize Weather Data Interpolated to a Point on a Map | 
| RNCEP | This package of functions retrieves, organizes, and visualizes weather data from either the NCEP/NCAR Reanalysis or NCEP/DOE Reanalysis II datasets | 
| robust.NCEP.gather.gaussian | Queries Weather Data | 
| robust.NCEP.gather.pressure | Queries Weather Data | 
| robust.NCEP.gather.surface | Queries Weather Data | 
| robust.NCEP.interp.gaussian | Interpolates Weather Data to a point in space and time | 
| robust.NCEP.interp.pressure | Interpolates Weather Data to a point in space and time | 
| robust.NCEP.interp.surface | Interpolates Weather Data to a point in space and time |