34 votes
Accepted

Are there any uncharted waters left on earth?

There are many "uncharted waters". Nautical charts have information about water depths, dangers to navigation, aids to navigation, anchorages, and other features. You can see here what might be ...
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  • 12.7k
23 votes
Accepted

Do satellites decrease the amount of solar radiation reaching Earth?

Does this huge collective quantity of objects (together with space trash) reflect away enough solar radiation to have a measurable effect? Could this affect Earth's climate, mitigating climate change? ...
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17 votes
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What are these underwater structures near 6°N 85°55'W

As the other answer suggests, these are sonar surveys of the ocean depths. But the answer is a bit more complicated. The vast majority of the ocean floor has never been mapped. We really only know ...
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14 votes
Accepted

What causes these banded clouds?

These are most certainly boundary layer rolls and not gravity waves. While there exists a visual similarity between the two phenomena, and both may exist in similar atmospheric conditions, they can be ...
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  • 4,925
13 votes

Are there any uncharted waters left on earth?

Considering that the Mid-Atlantic ridge was just discovered recently (in geological terms), much of the Earth's water is still unmapped. The surface can be easily mapped by satellites, as said by ...
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  • 302
13 votes

What are these underwater structures near 6°N 85°55'W

Supplementing Wolfgang's answer, here's a National Oceanographic and Atmospheric Administration story that talks about the appearance of ocean-bottom artifacts: With legions of people around the ...
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  • 2,803
12 votes

Are there any uncharted waters left on earth?

A lot depends on the definition of "charted". How much detail must we know for an area to gain this status? As others have said, we have a low-resolution idea of all of the non-ice-covered seabed from ...
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11 votes
Accepted

What is this narrow band of clouds?

Given the weather patterns, it looks like Google Earth is generating those cloud overlays from some recent (i.e., the current day) satellite images. That line is suspiciously close to the edge of ...
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  • 3,133
11 votes

Why are atmospheric BrO and ClO important to measure by satellite?

BrO and ClO significantly deplete ozone from the atmosphere. Researchers at Harvard University state: It is a remarkable fact that perhaps the most important observation coupling climate forcing ...
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  • 20.4k
10 votes
Accepted

What is the purpose of this large structure on a Japanese hillside?

The structure looks similar to this photograph of a "Japanese land retention system" mentioned in passing towards the bottom of this webpage. From the linked page: Land retention systems in Japan, ...
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  • 5,380
10 votes
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Locating Missing Airplanes using Remote-Sensing Satellites

Civilian earth observing SAR satellites do not always operate over empty swaths of oceans (specially in the middle of Indian Ocean) in order to save power. They are not designed to track a fast moving ...
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  • 2,361
8 votes
Accepted

Convert NO2 concentration in Sentinel-5P data from mol/m2 to μg/m3 on the ground level

...measured in mol/m² within the total or tropospheric column. Is it possible to deduce concentrations for a specific slice of the troposphere? Not really, since you have a crucial bit of information ...
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  • 11.1k
7 votes
Accepted

How to remove 'silk braid' noise in satellite data?

You ask, How to remove these abnormal value for more precise data? The short answer is that you might be able to make your data look more representative of the natural 'truth', but you will probably ...
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  • 10.7k
7 votes

How to convert mol/m^2 to total mass ( e.g gram, kg etc )?

$\rm \frac{mol}{m^2}$ shows the amount of $\rm{NO_2}$ in the atmosphere over a square meter of surface area - in mols. The molar mass of the $\rm{NO_2}$ is $14+2\cdot 16=46$. It means, the mass of 1 ...
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  • 642
6 votes
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Have these optical satellite ground station locations been chosen for clear skies?

Yes, mean cloud cover is routinely measured from satellites. Like all satellite data (and in fact all measurements), it does have an uncertainty, but for the purpose of this question the satellite ...
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  • 11.1k
6 votes
Accepted

How to find SMAP Satellite acquisiton plan?

As @gerrit pointed out, the Pytroll project has a couple of package which could be useful. To answer your question and get the next overpasses for the next twelve hours above a given location, you can ...
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5 votes

How to remove 'silk braid' noise in satellite data?

Thanks for @Kwinkunks's answer. I have read this paper. And this figure may explain something important. What I have already done is plotting the original data like the first subplot. From Destriped -...
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  • 2,439
5 votes

Have these optical satellite ground station locations been chosen for clear skies?

This is just supplemental information to the accepted answer by @gerrit I took the ESA cloud cover fraction map provided there, and added dots that represent the approximate locations of the ground ...
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  • 6,956
5 votes
Accepted

Satellite image displaying as panchromatic

An RGB image can not be rendered if you only supply information for one color channel. This is because three channels are needed: Red, Green and Blue. Different software will deal with this invalid ...
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5 votes
Accepted

How to open old GOES-1 satellite image files downloaded from NOAA CLASS

Unfortunately, the older weather satellite data is, the harder it is to read. Perhaps NOAA's Weather and Climate Toolkit can open it. The old stuff usually comes in tightly packed binary formats ...
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  • 11.1k
5 votes

Why are atmospheric BrO and ClO important to measure by satellite?

pretext: Seeing this question on the list of network questions caught my interest to the site. I agree with the arguments put forward in the answer by Fred, gravitating on the radical character of ...
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4 votes

What produces these distinct shapes in the Rub' al Khali seen from space?

This a great example of "self-organization" in a geomorphological system; this one an oscillating system at a fairly large scale. On a much smaller scale, you find similar structures on sand dune ...
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4 votes

What is principle of inverse modeling?

To my understanding, the question refers to studies which aim to estimate pollutant emission fluxes using satellite retrievals of atmospheric constituents. Mathematically, this means estimating the ...
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  • 391
4 votes

Difference between Meteosat and Insat satellite Images

Meteosat:- The Meteosat series of satellites are geostationary meteorological satellites operated by EUMETSAT under the Meteosat Transition Programme (MTP) and the Meteosat Second Generation (MSG) ...
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4 votes

What's the minimum number of days needed for reporting a "monthly average" of daily satellite retrievals?

Provide a monthly average in every grid cell, and describe how many measurements were used for each cell. There is no fixed rule for the minimum number of days for reporting a monthly average. A ...
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  • 11.1k
4 votes

What causes these banded clouds?

These features are internal gravity waves (IGW) and are characterized by alternating areas of upwards and downwards movement of air parcels. They propagate on a sharp density interface between a ...
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4 votes
Accepted

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

The paper basically combines multiple datasets to figure out the changes in ice surface elevation and ice thickness at tidal and multi-year timescales. That way they were able to study grounding line ...
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4 votes
Accepted

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

In the case of a ground looking radar, the cross-polarized signals HV and VH generally increase with surface roughness. For example, dense vegetation is one of the more depolarizing surface types ...
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4 votes
Accepted

In meteorology, are satellite data "better" than reanalysis data?

Unfortunately, your question has no answer. Both have errors. Both can be unreliable. Your choice really depends on how you plan on using them. Satellites instrument contain sources of error, such as ...
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