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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #912297 07/22/16 05:41 AM
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This image comes courtesy of Copenicus Sentinel-2A over the Kingdom of Tonga . Isn't this a super picture? It shows the island of Tongatapu and some nearby smaller islands in the archipelago of 169 islands. [Image processing of Sentinel data by ESA]

There are coral reefs north of the main island. ESA reports that
Quote:
scientists are experimenting with Sentinel-2 to monitor corals and detect coral bleaching. That happens when algae living in the corals’ tissues, which are essential to coral survival, are expelled owing to higher temperature. The whitening coral may die, with subsequent effects on the reef ecosystem, and thus fisheries, regional tourism and coastal protection.

The recent El Niño weather phenomenon has caused increased bleaching across the world’s corals, and scientists are finding Sentinel-2’s coverage helpful in monitoring this at reef-wide scales.


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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #914680 10/05/16 07:12 PM
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This is the Quarkziz Crater in western Algeria. The image from the Copernicus Sentinel-2A satellite shows part of the Anti-Atlas mountains bordering the Sahara Desert.

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The Anti-Atlas range was born from continental collision, and geologists believe it was once higher than the Himalayas, but was reduced through erosion. Here the land is mostly dry and barren as the mountains belong to the Saharan climate zone. But some stream channels created by occasional water runoff or from when the climate was much wetter than today, are visible.

The circle at the centre of the image is the Ouarkziz crater. Some 3.5 km across, the crater was created when a meteor hit Earth less than 70 million years ago, when dinosaurs still roamed the planet.


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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #914682 10/05/16 07:45 PM
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the pictures from space are amazing. I'll be watching some show on archaeology and they show how they use images taken from space to find pyramids, cities, etc. underground.

Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #914898 10/14/16 04:36 PM
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Landsat-8 satellite takes us over Iceland’s southeastern coast and the Vatnajökull glacier I in this false-colour image from 6 September 2014.

Copyright: USGS/ESA

Glaciers cover 11% of Iceland’s landscape, the largest being the Vatnajökull, which at 8000 sq km is also the largest in Europe. Up to a kilometre thick, the Vatna ice cap has about 30 outlet glaciers.

A number of volcanoes lie underneath this ice cap, including the infamous Grímsvötn, which caused disruption of northern European air traffic in recent years following eruptions and the spread of ash plumes. This volcano is visible as a black arc on the central-left side of the image.

Last edited by Mona - Astronomy; 10/14/16 04:41 PM.

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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #915026 10/20/16 04:47 PM
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These beautiful images taken by ESA's Sentinel-3A were released on October 20, 2016.

The two images were taken over northeast Greenland on June 13 and August 22 of this year. You can see the differences in the sea ice over that time period.


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Kathmandu [Re: Mona - Astronomy] #915054 10/22/16 08:29 AM
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This image from Sentinel 2-A data shows part of Nepal, including Kathmandu the capital city .

It's a false-color image. The vegetation is in red, waterways and buildings are light green and blue.

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One of the easier features to pick out of satellite images are airports, and the runways of the Tribhuvan International Airport are clearly visible near the centre of the valley.

This image demonstrates just a slice of Nepal’s varied terrain: from the mountains to the north to the plains in the south. We can see how water runs off of the mountains, forming large rivers that cut through the forested plain, with some areas of agriculture. The lower part of the image appears hazier than the mountainous areas because humidity is higher in the plains.


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Putorana Plateau, Siberia [Re: Mona - Astronomy] #915194 10/28/16 06:12 AM
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Here is an image of the Putorana Plateau, Siberia captured in March 2016 by the Copernicus Sentinel-2A satellite.

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It shows part of the Putoransky State Nature Reserve, which is listed as a UNESCO World Heritage Site. Situated about 100 km north of the Arctic Circle, the site serves as a major reindeer migration route – an increasingly rare natural phenomenon – and is one of the very few centres of plant species richness in the Arctic.

Virtually untouched by human influence, this isolated mountain range includes pristine forests and cold-water lake and river systems. The lakes are characterised by elongated, fjord-like shapes, such as Lake Ayan in the upper-central part of the image.

 
Credit: Copernicus Sentinel data (2016), processed by ESA


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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #915325 11/02/16 04:24 PM
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On October 30 2016 a 6.5 magnitude earthquake hit central Italy. This is a map made using data from the satellites Copernicus Sentinel-1A and 1B.

We can see how much the ground was deformed by the quake over about 130 sq km. The Castelluccio area had the maximum displacement - you can see it in red on the map.

(Contains modified Copernicus Sentinel data (2016)/ESA/CNR-IREA)


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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #915546 11/12/16 04:54 AM
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The Virunga Mountains in east Africa are a chain of volcanoes that lie across Rwanda's northern border with Uganda, east into the Democratic Republic of the Congo. Two of the volcanoes are active.

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The area is one of Africa’s most biologically diverse regions, but high human population density, poverty and conflict pose a challenge to conservation. Across the mountain range, however, a series of national parks has been established to protect the fauna and flora.

In this image, we can easily identify the delineation between the protected and non-protected lands – the green, orange and yellow dots indicate changes in the surface of non-protected lands between the radar scans that make up this composite image. These changes are primarily in vegetation as the land surrounding the mountains is blanketed with agricultural plots.

In particular, we can see the grid-like pattern of agriculture is visible in the green and yellow square at the centre of the image.


Contains modified Copernicus Sentinel data (2016), processed by ESA


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Re: Earth from Space - beautiful images [Re: Mona - Astronomy] #915548 11/12/16 09:30 AM
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So weird to look down onto that photo -

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