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Traditional radar sends directional pulses of electromagnetic energy & detects a presence, position and motion of an object (like an airplane) by analyzing a part of the energy reflected from either the object back to the radiolocation station. Imaging radio detection and ranging tries to form the picture of the object too. Many techniques use at times evolved to wash this. Usually it choose benefit of the Doppler shift caused per rotation or even more motion of a object & per ever-changing watch of a object caused by the proportional motion between the object & the back-scatter that is perceived by radio detection and ranging of the object (a plane) flying on top the globe. Across recent improvements of the techniques, this may be precisely estimated. Imaging radiolocation has been utilized to map a Globe & more planets & to categorize targets for military systems.

FlightBrief
DTN's NEXRAD data website. Loaded with real-time aviation weather images, easy-to-use flight route planner, and complete airport information.

WeatherTAP
Commercial site offering NexRad Doppler Radar maps, updated every 6 minutes, including national, regional and state radar maps, and lightning strike data.

WeatherMatrix Radar Supersite
The WeatherMatrix organization, formerly CASI, has put together a nice collection of radar-related links. The links range from those to current radar data, to links about radar sites and how they work. StormMatrix, a very unique feature to the Internet, is the only place you can find free NEXRAD storm table data online(30 min delay).

Plymouth State College NIDS Data
Free and regularly updated NEXRAD radar data. All NEXRAD sites are available on the site and several radar modes are offered as well including Base and Composite Reflectivity, Base and SRM Radial Velocity, VIL, and Storm Total Precipitation.

Live Weather Images
NEXRAD images directly from the National Weather Service covering the United States.

Intellicast NEXRAD Data
National USA radar image, map. Updates twice per hour. Links to other radar maps: Summary, Regional, Local NexRad, Storm Relative Mean Radial Velocity.

Weather.Net by Freese-Notis Weather
InterRAD Internet based doppler radar service, GPS based NEXRAD, advanced software since 1994.

Recreation: Aviation