Magnetic impurities in the sensor and errors in the measurement of the frequency are the two causes of errors in these magnetometers. The relationship between the frequency of the induced current and the strength of Earth's magnetic field is called the proton gyromagnetic ratio, and is equal to 0.042576 Hertz per nanotesla (Hz/nT).īecause the precession frequency depends only on atomic constants and the strength of the external magnetic field, the accuracy of this type of magnetometer is very good. This produces a weak magnetic field that is picked up by the same inductor. The field is then interrupted, and as protons are realigned with Earth's magnetic field, spinning protons precess at a specific frequency. One type of magnetometer is the proton precession magnetometer, which operates on the principle that protons are spinning on an axis aligned with the magnetic field.Īn inductor creates a strong magnetic field around a hydrogen-rich fluid, causing the protons to align themselves with the newly created field. Some scalar magnetometers are discussed below. The use of three orthogonal vector magnetometers allows the magnetic field strength, inclination and declination to be uniquely defined.Ī special magnetometer that continuously records data.Įxamples of vector magnetometers are fluxgates and superconducting quantum interference devices, or SQUIDs. Have the capability to measure the component of the magnetic field in a particular direction. Measure the total strength of the magnetic field to which they are subjected, and Magnetometers can be divided into two basic types: These include magnetic anomaly detectors for sensing submerged submarines from aircraft, unmanned remote detectors of the metal of vehicles and personnel, detonators that trigger when sensing a large metal mass (e.g., a ship), etc. There are a variety of military applications for magnetometers. There is a grid of magnetometers around the world constantly measuring the effect of the solar wind on the Earth's magnetic field. Magnetometers are very sensitive, and can give an indication of possible auroral activity before one can even see the light from the aurora. Magnetometers are also used to detect archeological sites, shipwrecks and other buried or submerged objects.Ī magnetometer can also be used by satellites like NASA's Magsat or German CHAMP satellites to measure both the magnitude and direction of the Earth's magnetic field. could put money into worldwind or make their own versions.Magnetometers are used in geophysical surveys to find changes in concentration of magnetic minerals in geologic formations (and also deposits of iron because they can measure the magnetic pull of iron). This coming from a Fed worker, at least my fulltime job. One last thing on the US govt, they are not suppose to do or be everything. The US govt = we the people, if the people want it, then we people step up to the plate.i.e., the volunteers and private donors to the worldwind project. Regardless of their decisions of where and how much they spend. budgets and funding for certain programs. Too me, bored real quick and less of an attention grabber.Īs far as US govt. What helped, was my background in geography focused on environmental applications of GIS and remote sensing. It didn't take me long to use the program.
#Nasa world wind vs cesium software#
I came upon the software not long after it's release.
Just takes more time and patience to use, the length of time is dependent on education and/or skill. Worldwind may be harder, but it doesn't take a rocket scientist to use either. Yes, google earth is easier for the general public. Ummm WorldWind is whatever the user whats to make of it. Can't really "use" screen shots from the application. Can be addapted to many different uses without having to change licenses or fork out a lot of money. WW, while slower, works on a modem connection. have to use buttons on the app to do most simple tasks. zoom is backwards to every other application out there. which is why they go to GE (even though it's interface is crap to use) May actually be too advanced for most users. so you ALWAYS have to be connected to the internet.
#Nasa world wind vs cesium free#
a lot of the stuff going on may actually be illegal to do in the free version. can't use it for anything other than personal use. well, GE may be older because they used a bastardized LandSat where WW uses USGS 1-meter imagery. but it is 90% of the US though because we can find it easier there.Īs for age.
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