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Posts tagged ASAR

Ships in Hakata Bay, Japan

33.5N 130.4E

April 27th, 2012 Category: Snapshots

Japan - January 14th, 2012

Visible in the lower left quadrant of this orthorectified image is Hakata Bay, located in the northwestern part of Fukuoka city, on the Japanese island of Kyūshū. It faces the Tsushima Strait, and features beaches and a port, though parts of the bay have been reclaimed in the expansion of the city of Fukuoka. The Bay is defined by Shoal Umi-no-nakamichi and Tombolo Shika-no-shima (Shika Island) to the north, and Genkai-jima (Genkai Island) to the northwest, and the Itoshima Peninsula to the west.

The bay is roughly 10 km from north to south, and 20 km from east to west, covering an area of roughly 133 km². The coastline stretches 128 km. The mouth of the bay is only 7.7 km wide, shielding it to a great extent from the waves of the Strait. The bay is only 10 metres deep on average, 23 m at its deepest point, though the tides bring a two metre change in the water level. Set routes are used, therefore, through the bay, to protect ships’ drafts. Several ships can be observed in the bay upon opening the full image, appearing as small white dots.

Multiple Rivers Near St. Louis, Missouri, USA

38.6N 90.1W

March 2nd, 2012 Category: Rivers

USA - December 29th, 2011

The bright white area in this ASAR image is the city of St. Louis, Missouri, USA. According to the United States Census Bureau, St. Louis has a total area of 66.2 square miles (171.3 km²), of which 61.9 square miles (160.4 km²) is land and 4.2 square miles (11.0 km² or 6.39%) is water. The city is built primarily on bluffs and terraces that rise 100–200 feet above the western banks of the Mississippi River, in the Midwestern United States just south of the Missouri-Mississippi confluence. Much of the area is a fertile and gently rolling prairie that features low hills and broad, shallow valleys. Both the Mississippi River and the Missouri River have cut large valleys with wide flood plains.

The Missouri River forms the northern border of St. Louis County, exclusive of a few areas where the river has changed its course. The Meramec River forms most of its southern border. To the east is the City and the Mississippi River. Near the southern boundary of the City of St. Louis (separating it from St. Louis County) is the River des Peres, virtually the only river or stream within the city limits that is not entirely underground. Most of River des Peres was confined to a channel or put underground in the 1920s and early 1930s.

Start of Iceberg Calving Off Pine Island Glacier, Antarctica – February 6th, 2012

75.1S 100W

February 6th, 2012 Category: Climate Change, Glaciers and Ice Caps

Pine Island Glacier - January 28th, 2012

The Pine Island Glacier, visible at the center of this image, is a large ice stream flowing west-northwest along the south side of the Hudson Mountains into Pine Island Bay, Amundsen Sea, Antarctica. The image focuses on a floating ice shelf at the downstream end of Pine Island Glacier. The crack shows the start of a large iceberg calving.

The area drained by Pine Island Glacier comprises about 10 percent of the West Antarctic Ice Sheet. Satellite measurements have shown that the Pine Island Glacier Basin has a greater net contribution of ice to the sea than any other ice drainage basin in the world and this has increased due to recent acceleration of the ice stream.

The Pine Island and Thwaites Glaciers are two of Antarctica’s five largest ice streams. Scientists have found that the flow of these ice streams has accelerated in recent years, and suggested that if they were to melt, global sea levels would rise by 0.9 to 1.9 m (2 ft 10 in to 6 ft 3 in), destabilising the entire West Antarctic Ice Sheet and perhaps sections of the East Antarctic Ice Sheet.

Bays and Bridges of San Francisco Bay Area, USA – January 31st, 2012

37.7N 122.4W

January 31st, 2012 Category: Image of the day

USA - December 27th, 2011

This orthorectified image shows the city of San Francisco and the San Francisco Bay Area, a region of 7.15 million people in California, USA. It encompasses a land area of about 46.9 square miles (121 km2) on the northern end of the San Francisco Peninsula, giving it a density of about 17,179 people per square mile (6,632 people per km2). It is the most densely settled large city (population greater than 200,000) in the state of California and the second-most densely populated large city in the United States after New York City. Here, this area appears bright white.

What is frequently referred to as the San Francisco Bay is actually a system of several interconnected bays: the San Francisco Bay (bottom) is connected to the San Pablo Bay, which in turn is joined with the Suisun Bay, above the image center. Here, the bridges spanning these bays can be observed as thin white lines over the dark black waters. These are, moving from just above the center to the lower right corner of the full image, the Richmond-San Rafael Bridge, the San Francisco-Oakland Bay Bridge, the San Mateo-Hayward Bridge, and the Dumbarton Bridge.

Bologna Near the Apennine Mountains, Italy

44.4N 11.3E

January 8th, 2012 Category: Mountains

Italy - December 29th, 2011

This orthorectified image shows urban areas in Emilia-Romagna, Italy. Visible near the right edge is the city of Bologna, the capital city of the region. The city lies between the Po River and the Apennine Mountains, which are visible in the lower part of the image.

More specifically, Bologna is located in the Padana Plains, at the foot of the Apennines, between the Reno and Savena river valleys. The provincial territory stretches out from the western edge of the Padana Plains on the border with Ferrara to the Tuscan-Emilian Apennines, ranging from 29 meters above sea level in the suburb of Corticella and 54m downtown to 300 meters above sea level in Sabbiuno and the Colle della Guardia, and 1945 meters above sea level at Corno alle Scale.

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