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Questions tagged [radar]

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Is this the correct way to extract U and V wind components from NEXRAD weather radar?

I am working with NEXRAD radar data, and I am trying to plot the U and V wind velocity for each point on a grid. There is a channel in the data called "Velocity" described as "A measure ...
scp's user avatar
  • 11
3 votes
0 answers
193 views

Investigating the "Leesburg split" rainfall anomaly

I've spent some time in the Leesburg, Virginia (USA) area and I've noticed that whenever a line of thunderstorms approaches the area, it frequently splits and goes around a particular spot just ...
SlowMagic's user avatar
3 votes
2 answers
82 views

Radially symmetric rainfall radar pattern?

I notice this radially symmetric weather radar pattern over London, UK today. Is this a real weather pattern, or a measurement or model artefact? If it is a real weather pattern, what causes it? The ...
Croad Langshan's user avatar
1 vote
0 answers
26 views

Single-Antenna-Single-Pass SAR interferometry

As I understand, for elevation mapping using InSAR, one typically requires an out-of-plane baseline to create the required phase difference between images to detect objects at height. This usually ...
Jan Lynn's user avatar
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4 votes
0 answers
54 views

Using radar to measure ocean waves along the shoreline

What radar technology would be best to measure the attributes of ocean waves near (under 2k distance) the shoreline?
Beach Bum's user avatar
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3 votes
0 answers
53 views

Question about VV and HH polarizations in radar

I am doing something with ASCAT which is measuring backscatter to reflect the status of soil moisture. Some research indicated that VV polarization is much more suitable for soil moisture measurement ...
Xu Shan's user avatar
  • 171
2 votes
0 answers
38 views

Limitations of satellite radar for precipitation measurement?

Companies like tomorrow.io are promising satellite-based weather radar. However, I can easily imagine several flaws (especially in combination with the greater distance to storms than a ground-based ...
Kofthefens's user avatar
5 votes
1 answer
1k views

Strange Circular Rays showing up on radar

Can anyone explain these strange rays? They seem to be pulsing in roughly the same location when you watch the radar and are always in the same circle pattern. Thanks for your input!
Sabine's user avatar
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3 votes
0 answers
52 views

Does Environment Canada offer archived radar data in gridded format like in the US?

I have seen social media-rologists (weather weenies on Twitter) using the Weatherscope app to display data from the Canadian radar network, which was recently upgraded to dual-pol. For many years, ...
spillthrill's user avatar
1 vote
0 answers
36 views

The-nature-of-sar-pixel-value-vs-of-panchromatic-pixel-value

When we compare sentinel-1 SAR orthorectified 8-bit image vs a very high resolution panchromatic 8-bit image, the panchromatic cells are a resemblance of signal amplitude in an 8-bit scale (0-255). ...
Ash's user avatar
  • 111
1 vote
0 answers
221 views

Noise level estimation using Hildebrand & Sekhon method

I have some data from a radar to process in order to find the moments and in turn the wind speeds. I have no prior knowledge in signal processing so it's giving me a hard time to estimate the noise ...
RogUE's user avatar
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6 votes
1 answer
344 views

What are these lines that I frequently see on doppler radar?

I frequently see lines like this (the red arrows in the image below point to what I am referring to) on doppler radars. They are usually propagating outward from a line of thunderstorms. What are they,...
magicmq's user avatar
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5 votes
1 answer
2k views

What is the use of HV or VH polarization in Radar?

Radar is a common tool in remote sensing, it is a so-called active instrument, hence it emits and receives energy. Modern Syntethic Aperture Radar (SAR) systems are capable of both transmitting and ...
ckrk's user avatar
  • 103
2 votes
1 answer
172 views

Why is Venus so cracked?

Wired.com's Space Photos of the Week: Perfectly Safe Celestial Coronas includes radar images of the surface of Venus taken from spacecraft in orbit around it. One of them shown below. What causes ...
uhoh's user avatar
  • 7,072
2 votes
1 answer
55 views

How does SMAP detect soil statistics?

So there's a NASA satellite called SMAP currently orbiting Earth right now, and it can measure soil moisture, and detect whether or not soil is frozen or thawed. It knows this since it uses radar to ...
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4 votes
1 answer
105 views

Giant Cavern the Size of Manhattan Under Thwaites Glacier in West Antarctica - how was satellite and airborne radar data combined?

This is a follow-up question to Giant Cavern the Size of Manhattan Under Thwaites Glacier in West Antarctica. The work is reported in an open access paper in Science: Heterogeneous retreat and ice ...
uhoh's user avatar
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3 votes
1 answer
488 views

Circular rain cloud observed in rain radar

This circular rain pattern was observed in Sydney’s rain radar today. It remained for the entire loop, wiggling around a bit but mostly staying in the same place. The fact that it’s centred around ...
Gimelist's user avatar
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5 votes
3 answers
210 views

Can weather radar be used to track swarms other than mayflies?

Along the Mississippi River swarms of emerging mayflies have been seen on radar. The radar and image below are from a July 11, 2017 emergence near LaCrosse, Wisconsin. On the radar you can see the ...
user avatar
1 vote
0 answers
38 views

Which wavelengths is limestone most transparent to?

I think of the non-ionizing range, e.g. Terahertz or Radio. Limestone clearly is transparent to x-ray or gamma but thats not what i am asking for. Natural to low ranges of porosity/water content ...
HannesH's user avatar
  • 221
1 vote
1 answer
86 views

Help understanding radar data in subglacial lake complex beneath Devon Ice Cap

The BBC News article Isolated lakes found beneath Canadian ice sheet links to the open access Science Advances article Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, ...
uhoh's user avatar
  • 7,072
7 votes
2 answers
1k views

How does ice-penetrating radar "see" through kilometers of ice without being absorbed?

The BBC News article Isolated lakes found beneath Canadian ice sheet links to the open access Science Advances article Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, ...
uhoh's user avatar
  • 7,072
5 votes
1 answer
325 views

Can I use radar data to estimate snowfall, or is there a better way?

The problem: There are lots of websites that provide snow forecasts for various ski resorts. The area of interest to me is Japan, specifically the Nagano area, where I use snow-forecast.com and www....
alvion's user avatar
  • 153
5 votes
1 answer
276 views

Need help understanding rain rate formulas from drop sizes

I have come across different formulas by which the rain rate [mm/s] or [mm/h] can be computed from the drop size distribution. I'm somehow unable to convert the different formulas into each other. It ...
jenna's user avatar
  • 53
3 votes
1 answer
121 views

Has PAZ satellite been launched?

There are several mentions in the net about Spanish radar satellite called "PAZ", which should work in tandem with German TerraSAR-X and should have been launched in 2015. But most results I can find ...
kakk11's user avatar
  • 338
4 votes
2 answers
368 views

Why can't radar's decibel scale be used to determine the intensity of snowfall?

According to the FAA's Aviation Weather Services advisory circular, Values below 15 dBZ are typically associated with clouds. However, they may also be caused by atmospheric particulate matter ...
Ryan Mortensen's user avatar
3 votes
1 answer
808 views

Using Range Height Indicator scan of radar

I am learning about the several modes of radar that are used to study structure of thunder storms and mesoscale systems. There are three modes of radar scans as documented here - Weather Radar Systems ...
user avatar
6 votes
1 answer
347 views

Eliminating range folding error in doppler radar returns

With weather radar, it's not uncommon to see large areas of the image blocked out due to detected range folding. It's my understanding that this occurs when a reflection outside of range comes back ...
Brad's user avatar
  • 167