Questions tagged [radar]
The radar tag has no usage guidance.
17
questions
7
votes
2answers
732 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, ...
6
votes
1answer
254 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 ...
6
votes
1answer
137 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,...
5
votes
3answers
200 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 ...
5
votes
1answer
345 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 ...
5
votes
1answer
267 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....
5
votes
1answer
239 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 ...
4
votes
2answers
244 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 ...
4
votes
1answer
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 ...
3
votes
1answer
319 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 ...
3
votes
1answer
662 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
...
3
votes
1answer
120 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 ...
2
votes
1answer
120 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 ...
2
votes
1answer
45 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 ...
1
vote
1answer
79 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, ...
1
vote
0answers
80 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 ...
1
vote
0answers
28 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 ...
