Questions tagged [earth-observation]

Observations recorded on earth.

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8
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1answer
617 views

Why does this shoreline change this way?

There are different reasons why a shoreline can change, including tides. But I've found a phenomenon that I can't explain. It happens in a Mediterranean beach called L'Esparrelló/La Caleta (link to ...
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1answer
33 views

Does the Sun and Moon basically appear to "move on the sky" identically regardless of location and date? [closed]

For a long time, I've been trying to use Stellarium (simulation) and many visualizations and animations in order to get a good idea of how the Sun and Moon move across the sky, as seen by a human from ...
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0answers
64 views

Why is the Regener-Pfotzer maximum (radiation in upper atmosphere) above central California?

The site https://spaceweather.com/ has a section called Space Weather Balloon Data which shows the image below and says: The data points in the graph above correspond to the peak of the Regener-...
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3answers
3k views

Comparing the Earth with a basketball?

(Please excuse my English) The picture above is an image of the Earth without water. We know that the picture above is a very exaggerated one. If the Earth were to shrink to the size of the picture ...
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2answers
166 views

Measuring the circumference of the earth - revisited

I have done a bit of research on this topic already and the easiest way seems to be the experiment by Eratosthenes. We pick two locations on the same latitude (of which we know the distance) and then ...
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1answer
62 views

How to obtain the saturation point of a soil layer from the volumetric soil water content data?

Would you please let me know if the following is accurate as an answer to the question: Suppose we have sensors which measure the volumetric soil water content of a soil layer for a long period (more ...
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1answer
68 views

Where to find reliable snowfall rate data?

Would you please let me know where I can find/download reliable snowfall rate datasets? I am looking for multiple weather stations (in different regions) or field measured data, that contain both ...
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0answers
67 views

How high must one be to see the curvatue of the earth with the naked eye? [duplicate]

I have read the various answers to this question provided by people with a higher intellect than me, however I am still confused. Even from the ISS your view is to the horizon some 1,435 miles in all ...
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1answer
42 views

Have cosmic ray muons or solar neutrinos been used to probe inside the Earth?

By looking at the attenuation of cosmic ray muons passing through pyramids as a function of their direction, it seems it is possible to "look inside" by mapping their 3D density distributions. ...
3
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1answer
76 views

What Earth Science research will be done from the International Space Station?

The April 9, 2020 NASA press release NASA Astronaut Chris Cassidy, Crewmates Arrive Safely at Space Station mentions: It is the third spaceflight for Cassidy and Ivanishin and the first for Vagner, ...
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1answer
180 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 ...
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71 views

Earth's Electricity

This question s titled according to of one of the Nikola Tesla's patents. There he stated that lightning generates electric waves in Earth. "In the course of certain investigations which I carried ...
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1answer
528 views

What is this narrow band of clouds?

I came across a narrow streak of clouds in Asia when playing with Google Earth. Does anyone know what that is?
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35 views

Which unsupervised classification method for non linear multivariate time series earth observation data in python

I have collect several data sets for a small region in Germany called Hessisches Ried (about 90 km²) from different sources for a time period from 2015 to 2019. Daily rainfall amount & daily ...
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35 views

Earth's magnetic and electric field in Hilly Areas

Can you please guide me as to what is the intensity of earth's magnetic and electric fields in different regions of earth. Also, specifically in case of hilly or mountainious regions.
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3answers
9k views

Does gravity increase the closer to the core you get?

Or does the mantle and crust above you counteract the increase at one point and it actually decreases?
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3answers
1k views

How is global greenhouse gas emission calculated?

I am sure there are different methodologies to arrive at such a number. Can someone in layman terms describe some of the most widely used and trusted methods and what data are used? Sorry I am outside ...
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0answers
24 views

Why are Nowcasting SAF daytime products apparently truncated at solar angles of 20° (rather than the documented 10°)?

This image shows the Nowcasting Satellite Application Facility (NWCSAF) Cloud Liquid Water Path (LWP) product for 2020-01-08T12:00:00Z: Cloud LWP from NWCSAF. Source: NWCSAF. The Algorithm ...
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2answers
1k views

Can I see curvature of the Earth on a picture

I've been piloting a drone yesterday and made a video hovering at around 100m, the visibility was very good. I've shown the video to a friend of mine and we were arguing whether it's the curvature of ...
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1answer
59 views

Is there a name for a "moving meridian" corresponding to particular solar time?

Imagine a meridian that moves over the Earth's surface such that it remains at the longitude that corresponds to a particular solar time (e.g. midday). This meridian would remain stationary relative ...
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Why does the OSCAR database describe Landsats fire identification as "daylight only"?

The World Meteorological Organisation (WMO) Observing Systems Capability Analysis and Review (OSCAR) Tool describes the High-Resolution Imager (HRI) (which flies on Pléades-1A and -1B, among other ...
7
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1answer
57 views

Would the subsurface event leading to tree death at West Tern Lake in Yellowstone be visible in thermal imaging?

The New York Times article It’s Warm and Stealthy, and It Killed Yellowstone Trees and Turned Soil Pale describes an even that took place over the past few decades where a small and well-defined ...
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2answers
465 views

What are these Gizmos at Izaña Atmospheric Research Center in Spain?

This tweet from the account of the Centro de Investigación Atmosférica de Izaña (AEMET) http://izana.aemet.es Izaña Atmospheric Research Center (AEMET) shows images of meteorological instruments ...
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1answer
925 views

Where are old Himawari weather satellite images available to the public? Is the 18-Dec-2018 Bearing Sea fireball still there?

In Scott Manley's new video 173 Kiloton Explosion Over Bering Sea Was Asteroid Breaking Up a bit after 01:30 he says The good news is that in these days of near-...
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2answers
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Time standard for IERS Bulletin A

IERS Bulletin A and Bulletin B contains Earth orientation parameters. These include the time difference between UT1 and UTC and pole position. The values for these parameters are listed once per day, ...
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1answer
190 views

What are these Gizmos at Mauna Loa Observatory?

Artist Rosten Wu's Vimeo channel has a video title Bridging Time and there is discussion about the Keeling Curve and the site where it all began in Hawaii. In the video there is a shot of a weather ...
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1answer
57 views

Artefacts in PERSIANN-CCS data

I downloaded PERSIANN-CCS for the region of Pawlowdar, Kazakhstan and this has stripes all over my downloaded data. For another AOI in Kazakhstan I do not have this problem. Does anyone of you have ...
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26 views

The differences on the atmospheric transportation for various trace metal in atmosphere

I have known that the atmospheric lifetimes of chemical species were highly dependent on their physicochemical properties. For example, $SO_2$ might exist for 5-8 days, while $NO_2$ could only exist ...
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1answer
258 views

Seeming correlation between time of day and earthquakes

I live in a generally geographically active area (Southern California, near the San Andreas fault, if that matters), that has had two relatively minor earthquakes that I have felt in the last week (in ...
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1answer
208 views

What physical measurement / elevation is used to define Earth's radius?

Earth's radius is usually given as 6378137 meters (equatorial radius), its flattening is defined as 1/298.257223 (WGS84), and thus its polar radius is calculated as 6356752 meters. However, the ...
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1answer
642 views

Every 202,500 years, Earth wanders in a new direction; does it affect climate?

I refer to this article on nytimes.com: Every 202,500 Years, Earth Wanders in a New Direction TLDR: Scientists believe the earth's orbit oscillates between circular and more elliptical due to the ...
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2k views

Effects of CERN on earth's magnetic field?

CERN is a scientific site developed to create anti matter. Does this have any negative impact on the environment?
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1answer
156 views

Volcano in ocean?

Is it a volcano in this image ? The magnified version. I was browsing through earth images here when I spotted this orange thing. Is it some oceanic volcano? It may be an absurd question but is it ...
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78 views

How much curvature of the Earth can be seen at altitude? [duplicate]

Is there an equation that produces the amount of curvature of the Earth one should see at the altitude of x (whatever x may be)? ...
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4answers
4k views

What are we seeing when we see the curvature of Earth?

I don't know if this question's for here, physics, maths, or geometry. I know that this or something similar has been asked a million times, but I've recently come to the concept that since the ...
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1answer
417 views

Understanding pushbroom sensors

Does a push broom scanner scan a path perpendicular to the direction of satellite travel? I am confused because its detectors are arranged across track even though it scans along track.
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1answer
114 views

Can someone provide a map of Nazca lines with this image in it?

I found this image of a bird with another image below its right wing on google earth in nazca peru. Is there any maps or infomation available that can help me identify this one? Kind regards Jeff B.
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426 views

Trewartha climate classification overlap?

By my reading of the wikipedia page on the Trewartha climate classification, climate classifications are not mutually exclusive. Let's take a look at the climate classification of Iowa City, IA. The ...
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3answers
219 views

Had the climatologists predicted climate change as the deviations to both extremely cold and hot temperatures before?

Recently I read that the current extreme snowfall in northern temperate climate is caused by the increased evaporation due to the global warming. Had any scientist predicted these extremes before ...
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2answers
642 views

Climate change hoax [closed]

I see many scientific articles and newspapers out there saying that the climate change is happening. Yet, there are people who believe climate change is a hoax and a lie. But I haven't seen any '...
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1answer
24k views

What time and date is the sun directly overhead a given place on Earth?

In different regions, the sun is directly overhead at different times of the year. When do these event happen?
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Does the hour of the day and the position on the sun have any influences on the formation of a hurricane?

I am writing an essay and cannot find if a hurricane is influenced by the position of the sun or the hour of the day.
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1answer
117 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 ...
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1answer
1k views

How to locally identify a cold front passage?

I know that the passage of a cold front affects local conditions by decreasing the temperature and shifting the winds. Some precipitation could happen as well. How do software that analyze weather ...
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0answers
86 views

WMM and IGRF model?

I am studying about World Magnetic Model (WMM) and International Geomagnetic Reference Field (IGRF) model provides the seven parameters about the earth magnetic field. These models have to be deployed ...
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1answer
79 views

How can parameters of the ionosphere be calculated?

How can parameters of the ionosphere be calculated? Specifically, how do we calculate total ion density, total ion temperature and individual major ion densities from I-V Characteristics curve of ...
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3answers
644 views

What sort of geological features would you look for to find copper?

What sort of geological features would you look for to find this precious resource?
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1answer
170 views

Pure blue sky in Spring [closed]

I live in France. Is it true that there are more occurrences of deep blue skies during spring. If yes why ? Is it true also during autumn. Thank you for answering
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2answers
288 views

At what latitudes does daytime last exactly 24 hours once in the year?

I assume at the Solstice - a definite latitude would have exactly 24 hours of daylight. What latitudes (North and South) are these - they might vary a little with longitude?
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41 views

Distribution of thermometric devices on earth

In complex climate models, measurements of Earth-based thermometers are used. What is their geographic distribution - historically? Does each measurement get equal weight?