Why are some Radar images smoother than others?
363479
Mostly it depends on the people operating the radar itself. Sometimes they don't want 15 colors they just want 4 or 5 stark colors showing the most change in the severity of the storm.\n\nSecondly...It can also depend in the software that they use to interpret the radar data a show it on the screen. About 70% of the television stations out there use a form of Baron Services weather software for their radar data and storm tracking capabilities. For a sample you can go to http://www.baronservices.com
645231
Signals can be affected by multipath issues, where the radio signals reflect off surrounding terrain- buildings, canyon walls, hard ground, etc. This delay in reaching the receiver causes inaccuracy.
889347
I can't remember exactly, but it has to do witht the way the laser and disk interact.  It is something like the disk has a mid-line in each track and the image is created on one side or the other of the mid-line.  If you have a CDR+ drive trying to write to a CDR- disk, the information will not be correct because the laser was writing on the "unformatted" side of the track.  Like I said I don't remember exactly, so maybe someone else will be able to expand or clarify on the explaination..
470729
a good radar reflective surface has to be hard and flat, just like a ball bouncing back off a wall, you want the radar reflection to bounce back to the receiver with most of the strength that was sent out so you can get a good 'reflection'\nthe balloon is round so not a good reflective target, the aluminium is a metal so a good reflective material, it all depends on the line of sight as well. If the balloon was right in the middle of the radar beam width it might give of a weak sig? depends on the size of the balloon as well. A huge blimp of that material would give a better reflection than a normal size balloon. Hope this was a help.
363353
It's probably the water causing refraction of the scope.  You'll see that at higher magnifications.  I think it's the same principle as a snowflake.
8264
It's because of the minor imperfections in the placement of the mirrors. Also, because the effect can't be seen without seeing it at an angle, it causes a curve based on your viewpoint.
390325
Technically, no, there isn't any web site which offers truly delay-free radar imagery. This is because Doppler radar takes time (5 minutes in clear-air mode, 3 in severe weather mode) to pan the horizon. It's a mechanical device, with a narrow field of view, so it must rotate in order to complete each image. However, there are web sites which update their radar imagery in real-time, as the image is relayed. The one I tend to use is www.weathertap.com, an excellent and well-regarded site for and by severe weather experts. It's a premium site, but for $4/month, you get real-time Doppler feeds with movable zoom, and all possible products (including multi-tilt storm relative velocity, radial velocity, echo tops, VAD, vertically integrated liquid, everything). You also get extremely high res visible sat imagery (to 1-km), lightning data, and (a boon to aviation people) aviation weather products with official route briefings and a link to DTC DUATS. Clearly, this is not necessarily the site for civilians and it has a steep learning curve, but it is the best available.
765826
It's because p waves are faster than s waves, so the difference is related to how far away the source is.  The bigger the difference, the farther away.
709071
On some shot locations it has to do with the rotational angle to where it is you're searching. The other thing you may try is doing a very slow zoom, as this changes the focusing aperature. I have similar problems with my view cam when I zoom in to fast. The slower rate allows for the focus to establish more defined.
237188
they are smoother than the rest
482962
Radar works because radio waves are reflected off of many objects. Stealth fighters are designed to hide from radar by minimizing the amount of radio waves reflected. I am sure a technologically advanced civilization could hide from our radar, however that would also imply that they want to. If they were trying to make contact, I am sure they could make sure we see them on radar.
266011
the variation from scan plane to scan plane is normally larger than the variation over angle for a single scan plane
1050743
A radar that is based in space!
1091686
A\n\n-Doppler radar measures Speed of the target\n-While Normal radar only measures the Range or position of target\n-Pulse Doppler Radar(PDR) measures Speed+location of target
368313
Ans. C.\n\nThey are having different frequencies.\n\nThey move with same velocity.\n\nThey have same type of polarization.\n\nOrange has a longer wavelength than yellow.
133718
There are two kinds of doppler radar. One is the radar cops use to tell if you are speeding. The waves come out of the radar gun and bounce off your car. Depending on whether your car is moving toward the radar or away, it either adds a little energy to the waves or takes a little away. This changes the frequency (how many waves per second.) The radar gun detects the reflected waves coming back (like an echo) and calculates the speed based on the difference between the original frequency and the frequency when it returns changed. The radar gun displays a number, and that's how fast you are going. They are very accurate.\n\nDoppler weather radar works in a similar way, but it is measuring the speed of the clouds. The faster the clouds move, it generally means the heavier the rain is (also for violent thunderstorms and tornados.) The radar picks up the movement of the clouds, because just like the metal in your car, they reflect some of the microwaves that the radar set puts out. Same as the speed radar, they can tell whether the storm is moving toward the radar or away from it, and how fast. A computer assigns each speed value a different color and that is the radar map you see on the news channel. It shows the clouds all moving at slightly different speeds, with the fastest ones being the most dangerous (dump the most rain, generate the most lightning, cause the most wind damage.)\n\nProblems with it. If you are not moving toward the cop car or away from it, they can't tell how fast you are moving. The radar can't tell anything about something moving at a right angle to the radar beam. The waves come out in a fairly tight beam, like a searchlight, only invisible. The object has to stay in the beam for the radar system to recognize the waves that are coming back. In the case of an object moving across the beam, the waves return with their frequency unchanged, meaning that it is not moving closer toward or further away from the radar, then it moves out of the beam and the radar doesn't know it is there any more. It does not 'see' it.  That's why it can't tell how fast that item is moving. \n\nI think that weather radar usually has several stations throughout an area, or the radar beam sweeps across the area like a searchlight, so it can show several overlapping pictures of the same storm. Also, if it is just an air mass (no clouds) the radar can't 'see' it, because the radar waves go through the air. Air is transparent to radar, just like it is to light.\n\nI haven't said anything about how the radar set generates microwaves, or about how military stealth jets are less visible to radar, that would be another whole long topic. I think you wanted to know how the radar works in relation to the outside world, not how it works inside. I hope this helps.
28138
Infrared. Radar. Sonar. does that help?