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Archive for October 20th, 2009

The Cook Inlet and Nearby Features, Alaska, USA

59.5N 155.1W

October 20th, 2009 Category: Lakes

Alaska, USA - August 11th, 2009

Alaska, USA - August 11th, 2009

The junction of two mountain ranges, the Alaska Range from the North and the Aleutian Range from the South, can be noted near the center of this image of Alaska, USA. Near this juncture is Lake Iliamna, dark blue, the state’s largest lake.

East of the lake and mountains is Cook Inlet, which stretches 180 mi from the Gulf of Alaska (below) to Anchorage (above) in south-central Alaska. Here, greyish-tan sediments flow from the upper reaches of the inlet down towards the gulf.

West of the Alaska Range and Lake Iliamna, on the other hand, is a flatter area of terrain. Here, the Kuskokwim River can be seen flowing southwest towards the Bering Sea. The river, which is approximately 724 miles (1,165 km) long, is also the longest river entirely contained within one state of the USA.

Fortaleza and the Orós Reservoir in Brazil’s Ceará State

October 20th, 2009 Category: Lakes

Brazil - August 31st, 2009

Brazil - August 31st, 2009

The city of Fortaleza, the capital of Brazil’s Ceará state, appears as an orange-tan area towards the center of the coastline. Located in Northeastern Brazil, Fortaleza has an area of 313 square kilometres (121 sq mi) and a population of over 3.4 million in its metropolitan region.

To the north of the city lies the Atlantic Ocean; to the south are the cities of Pacatuba, Eusébio, Maracanaú and Itaitinga; to the east is the county of Aquiraz and the Atlantic Ocean; and to the west is the city of Caucaia.

The land around Fortaleza is tropical forest with high rainfall of between 2,000 millimetres (79 in) and 1,700 millimetres (67 in) per year. The soil can be poor because high rainfall tends to leech out soluble nutrients.

South of the city, several large reservoirs can be seen, including the Orós Reservoir (surrounded by clouds on three sides, near the bottom center), the second-largest reservoir in Ceará. It was constructed in 1960 by damming the Jaguaribe River. The waters of the reservoir are used for irrigation upstream.

Wide-Swath Image of Northern Portugal and Northwestern Spain – October 20th, 2009

42.5N 5.5W

October 20th, 2009 Category: Image of the day

Portugal and Spain - August 27th, 2009

Portugal and Spain - August 27th, 2009

A Coruña

A Coruña

León

León

The main image here is an orthorectified wide-swath ASAR (radar) image of northern Portugal and northwestern Spain. The swath is five times wider than a normal IMM image, making it possible to observe larger areas.

The close-ups, on the other hand, examine smaller sections of the original image. One focuses on the city of A Coruña, the second largest city in Galicia in northwestern Spain. A Coruña is a busy port located on a promontory in the entrance of an estuary in a large gulf on the Atlantic Ocean.

The other close-up shows the city of León, the capital of León province in the autonomous community of Castile and León, in northwest Spain. The city is located below the Cantabrian Mountains.

Coast of Western Australia from the North West Cape to Perth

31.9S 115.8E

October 20th, 2009 Category: Snapshots

Australia - September 4th, 2009

Australia - September 4th, 2009

Western Australia is a state of Australia, occupying the entire western third of the continent. Australia’s largest state and the second largest subnational entity in the world, it has 2.1 million inhabitants (10% of the national total), 85% of whom live in the south-west corner of the state.

Here, the westernmost part of the state is visible from the North West Cape (the peninsula towards the upper left) in the Gascoyne Region to Perth, the state’s capital city. In total, the state has 12,889 km of coastline.

Here, the terrain gradually changes from rusty red and arid to bright green and vegetated. This is because the southern part of the state receives the bulk of rainfall, due to west- to east-moving cold frontal low pressure depressions, originating off the edge of the winter pack-ice in the Southern Ocean, south of South Africa.

Cold southern airflows, wedging beneath humid north westerly winds triggers vertical instabilities, bringing this region the bulk of its rain between May and August.