File:Saint Helena Island.jpg

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Summary

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Description
English: This astronaut photograph shows the island’s sharp peaks and deep ravines; the rugged topography results from erosion of the volcanic rocks that make up the island. The change in elevation from the coast to the interior creates a climate gradient. The higher, wetter centre is covered with green vegetation, whereas the lower coastal areas are drier and hotter, with little vegetation cover.
Français : Photo de l'île de Sainte Hélène prise par un astronaute de la NASA. On peut voir les pics élevés de l'île et ses ravines profondes. Cette topographie accidentée résulte de l'action de l'érosion sur les roches volcaniques dont l'île est constituée. Le changement d'élévation entre la périphérie et le centre de l'île créé un gradient climatique: le sommet est plus frais et humide, il est couvert de végétation. Les côtes, plus chaudes et sèches, laissent apparaitre la roche nue.


International Space Station InsigniaISS Crew Earth Observations: ISS019-E-14918International Space Station Insignia
Identification
Mission ISS019 (Expedition 19)
Roll E
Frame 14918
Country or Geographic Name ATLANTIC OCEAN I(S).
Features ST HELENA I., JAMESTOWN, DIANA PK., FOR., RAVINES
Center Point Latitude -16.0° N
Center Point Longitude -5.7° E
Camera
Camera Tilt
Camera Focal Length 400 mm
Camera Nikon D2Xs
Film 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.
Quality
Percentage of Cloud Cover 11-25%
Nadir What is Nadir?
Date 2009-05-07
Time 08:37:05
Nadir Point Latitude -15.7° N
Nadir Point Longitude -5.5° E
Nadir to Photo Center Direction Southwest
Sun Azimuth 62°
Spacecraft Altitude 193 nautical miles (357 km)
Sun Elevation Angle 26°
Orbit Number 3952
Original image caption
Saint Helena Island, located in the South Atlantic Ocean approximately 1,860 kilometers (1,156 miles) west of Africa, was one of the many isolated islands that naturalist Charles Darwin visited during his scientific voyages in the nineteenth century. He visited the island in 1836 aboard the HMS Beagle, recording observations of the plants, animals, and geology that would shape his theory of evolution. This image was acquired by astronauts onboard the International Space Station as part of an ongoing effort (the HMS Beagle Project to document current biodiversity in areas visited by Charles Darwin.

This astronaut photograph shows the island’s sharp peaks and deep ravines; the rugged topography results from erosion of the volcanic rocks that make up the island. The change in elevation from the coast to the interior creates a climate gradient. The higher, wetter center is covered with green vegetation, whereas the lower coastal areas are drier and hotter, with little vegetation cover. Human presence on the island has also caused dramatic changes to the original plants and animals of the island. Only about 10 percent of the forest cover observed by the first explorers now remains in a semi-natural state, concentrated in the interior highlands.

Saint Helena Island is perhaps best known as the final resting place of Napoleon Bonaparte I of France. Bonaparte was exiled to the island following his defeat at the Battle of Waterloo in 1815; he died on the island six years later in 1821. Today, the island is a British Overseas Territory, with access provided thirty times a year by a single ship, the Royal Mail Ship St. Helena.

Date
Source NASA Earth Observatory
Author This image was taken by the NASA Expedition 19 crew.
Other versions
Camera location 15° 56′ 59.9″ S, 5° 42′ 00″ W Kartographer map based on OpenStreetMap. View this and other nearby images on: OpenStreetMap - Google Earth info

This photograph was acquired with a Nikon 2DXs digital camera fitted with a 400 mm lens, and is provided by the ISS Crew Earth Observations experiment and Image Science & Analysis Laboratory, Johnson Space Centre.

Licensing

Public domain
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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File history

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Date/Time Thumbnail Dimensions User Comment
current 11:28, 23 March 2015 Thumbnail for version as of 11:28, 23 March 2015 1,440 × 1,080 (634 KB) Julian Herzog Reverted to version as of 18:00, 19 March 2015, rotation was done then.
08:00, 20 March 2015 Thumbnail for version as of 08:00, 20 March 2015 1,440 × 1,080 (634 KB) SteinsplitterBot Bot: Image rotated by 180°
18:00, 19 March 2015 Thumbnail for version as of 18:00, 19 March 2015 1,440 × 1,080 (634 KB) SteinsplitterBot Bot: Image rotated by 180°
09:40, 15 June 2009 Thumbnail for version as of 09:40, 15 June 2009 1,440 × 1,080 (622 KB) Originalwana {{Information |Description={{en|1=This astronaut photograph shows the island’s sharp peaks and deep ravines; the rugged topography results from erosion of the volcanic rocks that make up the island. The change in elevation from the coast to the interior
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