Questions tagged [satellites]

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20 views

What's a Good Soil Quality Index for Plowed Farm Lands?

I'm currently conducting research using Satellite/Weather/Soil (Mostly Sentinel-2 Satellite Imagery) Data to Model Smallholder Farms and their dynamics before Planting. Key to my progress is to find ...
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2answers
106 views

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

While google earth-researching the sea floor near Malpelo and Cocos Islands (Colombian and Costa Rican Pacific Ocean), I came along these strangely geometrical structures in the sea floor, located ...
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1answer
51 views

Where I can find high-res public domain images of Countries or Continents on the web

I found this one of Africa: That one is nice because it's > 3000x3000px which is large enough. I have looked around a bit for ones of these countries but haven't found anything that is large/high ...
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How to transform level 2 satellite retrievals to level 3 gridded data

Usually, I use level-3 gridded satellite data to analyze the spatial and temporal patterns of atmospheric compositions. However, there were some data sources which only afford level 2 product. For ...
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1answer
80 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 ...
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Detailed gravity maps

Does anyone know if it is possible to get a gravity map of a specific region of Greenland? The data I've found here http://icgem.gfz-potsdam.de/vis3d/longtime , are simply of to low spatial ...
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1answer
42 views

Where can I download Landsat 7 data as GeoTiff

I want to test a program for image classification that uses GeoTiff data with a separate file for each band. So I'm looking for some sample satellite data, preferably of Landsat 7, that doesn't need ...
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1answer
172 views

Landsat 5 DN's to Top of Atmosphere reflectance

The landsat 7 etm+ users handbook does the the Dn to top atmosphere correction (pages 79-80, link below). Is this applicable to landsat 5 tm as well? Landsat 7 User Handbook
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1answer
54 views

Satellite image displaying as panchromatic

I have a 4 band image (Blue, Green, Red and Near Infrared). If I display my image with only the green band in the RGB channel, the image displayed is panchromatic. Why is that?
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17 views

How long is the ISS visible from Earth? [closed]

If I‘d lie on the ground and the ISS became visible, how long could I see it (min/sec), if the circumstances were perfect and I didn't change my position?
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1answer
27 views

How to calculate the snow cover area from satellite data in better and efficient way?

Satellite retrievals contain cloud cover, biases e.t.c which is the main challenge to prepare the data for further analysis. After all, how we can efficiently calculate the snow cover and its ...
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65 views

Global Land and Sea Surface Temperature Data

We are a spin-off from TU Munich and currently working on equipping a CubeSat with a thermal imager. The imager should be able to acquire thermal/ir images with resolution of about 200m/px. In the ...
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1answer
85 views

Where can I find geomagnetic observations for the Indian Ocean region in 2017?

I am looking for the geomagnetic data for the Indian Ocean region. The 3D data should correspond to longitude-latitude grids at hourly intervals. The model data is easily available at NOAA but I need ...
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0answers
99 views

How to read EUMETCAST GOME-2 data?

We receive EUMETCAST data with different formats in our local station, I am having the most difficulty when trying to read or sometimes even know the format of a specific data product, in this case, ...
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1answer
77 views

Satellites minerals finding capability

Just wondering with the latest satellites currently available, is it possible to locate gold which is buried under 200 ft? what is the maximum depth that satellites can look for such minerals.
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1answer
165 views

What are these features in the Tombouctou Region?

I’ve recently been very interested in globe-trotting via Google Earth. At first I was using it to plan out hikes to possible mineral deposits locally, or potential fossils/ archeology sites. However I ...
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2answers
335 views

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

update: Searching "Rub' al Khali Empty Quarter" found "Q2: What are sabkhas?" in https://www.geocaching.com/geocache/GC6BYQ0_rub-al-khali-the-empty-quarter which seems to be related. From the NASA ...
4
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1answer
65 views

The higher value range for the same satellite product (NO2_OMI_TEMIS)

I'm dealing with NO2 column density of troposphere, and my data source is TEMIS. The NO2 level3 data can be derived from the original information of OMI instrument. I have downloaded two types of ...
4
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2answers
392 views

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

Having lived in southern California, I know that some areas on the planet can be absurdly sunny and clear throughout the year, and having lived several other places, I know some areas can be ...
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1answer
113 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 ...
4
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1answer
293 views

What is principle of inverse modeling?

I read a few paper related to emission inventory talking about the inverse modeling. It was another method to estimate the emission from ground(called top-down ...
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81 views

Which image is accurate viz insat or meteostat?

I regularly watch both the above said satellite images for India, particularly for chennai. I notice there is lot of difference between the two. Which one is accurate to foresee the rains ?.Generally, ...
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2answers
295 views

What is the average cholorphyll concentration for the ocean?

For chlorophyll-a, measured in mg/m3, what are the average values for: Open ocean in general (global) Northen latitudes (N. Atlantic Ocean) Coastal waters around the UK (North sea, Irish Sea, etc) ...
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2answers
220 views

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

Satellite remote sensing data is a powerful tool for researching the spatial distribution and temporal variation of atmospheric species. Aura is one satellite owing to NASA which meaning ...
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0answers
40 views

Conversion factor between different Landsats?

I have collected data (spectral bands) from Landsat 4-5 and Landsat 8. I was calculating NDVI when I noticed that the two Landsats have different band numbers designated as Red and Near Infra Red (...
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3answers
2k views

Difference between Meteosat and Insat satellite Images

I have seen many times that their are two kinds of Satellite Images shown on the websites like Skymet for India i.e. Meteosat satellite images Insat satellite images I want to understand the basic ...
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1answer
84 views

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

NASA's Earth Observing System produces many maps of air quality and land-surface variables, from instruments like MODIS, AIRS, OMI, VIIRS, etc. Both NASA and the scientific community produce maps of ...
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422 views

Monitoring air pollution with Landsat satellite data

I'm trying to build an air pollution model. So far I have built one for point sources. Now I'm looking at monitoring air pollution with satellite images, based on the idea that every basic pollutant ...
4
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1answer
267 views

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

A Google satellite view shows an unusual structure on a hillside in Miyazaki Prefecture, Japan (Latitude 31.782600°N, Longitude 131.233881°E): It measures about 170m by 120m and is structured in ...
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1answer
569 views

Locating Missing Airplanes using Remote-Sensing Satellites

The Maylaysian jetliner that went missing has yet to be found. There are many remote sensing satellites, equipped with radars, currently in service. Together, they provide good coverage of the entire ...
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3answers
2k views

What causes these banded clouds?

A set of banded clouds can be seen in MODIS imagery during several days in January and February over the Gulf of Maine. They tend to occur with very cold winds from the NW following storms. There are ...
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4answers
7k views

Are there any uncharted waters left on earth?

While reading about the ghost ship Jiang Seng I noticed that Wikipedia claimed it was drifting in uncharted waters in the Gulf of Carpentaria. I tried to find a primary source referencing uncharted ...