Questions tagged [radar]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
7 votes
2 answers
857 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, ...
user avatar
  • 6,956
6 votes
1 answer
283 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 ...
user avatar
  • 167
6 votes
1 answer
201 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,...
user avatar
  • 161
5 votes
3 answers
204 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
5 votes
1 answer
798 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 ...
user avatar
  • 103
5 votes
1 answer
287 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....
user avatar
  • 153
5 votes
1 answer
248 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 ...
user avatar
  • 53
4 votes
2 answers
283 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 ...
user avatar
4 votes
1 answer
593 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!
user avatar
  • 41
4 votes
1 answer
100 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 ...
user avatar
  • 6,956
3 votes
1 answer
361 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 ...
user avatar
  • 22.3k
3 votes
1 answer
709 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
  • 6,277
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 ...
user avatar
  • 318
2 votes
1 answer
127 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 ...
user avatar
  • 6,956
2 votes
1 answer
49 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 ...
user avatar
2 votes
0 answers
23 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, ...
user avatar
1 vote
1 answer
81 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, ...
user avatar
  • 6,956
1 vote
0 answers
26 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). ...
user avatar
  • 111
1 vote
0 answers
108 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 ...
user avatar
  • 203
1 vote
0 answers
30 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 ...
user avatar
  • 191