V-Z V/H Velocity to Height ratio VCO Voltage Control Oscillator VHF Very-High Frequency VIRS Visible Infrared Scanner VNIR Visible and Near Infrared Radiometer VSAR Variable off-nadir angle Synthetic Aperture Rader VSWR Voltage Standing Wave Ratio VTIR Visible and Thermal Infrared Radiometer WAN Wide Area Network WBTR Wide-band Video Tape Recorder WCRP World Climate Research Programme WO Work Order WPS Wallops WRS World Reference System WS Work Station WWW World Wide Web XS Multi Spectral Mode