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Posts tagged FAPAR

Cameroon and Eastern Nigeria, Observed by FAPAR

5.2N 8.9E

December 20th, 2009 Category: Climate Change

Nigeria - November 18th, 2009

Nigeria - November 18th, 2009

FAPAR, which stands for Fraction of Absorbed Photosynthetically Active Radiation, provides data on the vegetation index of a given zone and can be used to study the changes in the planet’s vegetation system. The color spectrum over land runs from red (1.0), to green, to yellow and white (0.0), while bodies of water appear blue.

In this image of eastern Nigeria (left) and Cameroon (right), photosynthetic activity increases as one moves away from the dry Sahel and towards the coast. Some dark red areas, indicating high photosynthetic activity, are visible near the  Niger River (far left) and the Nigeria-Cameroon border (lower left quadrant). The most active zone is  in that frontier zone, in the Korup and Cross River National Parks, which have a tropical rainforest habitat.

Rainforest Vegetation Near Mouth of Amazon River, Brazil

1.4S 51.6W

December 19th, 2009 Category: Climate Change, Rivers

Brazil - November 17th, 2009

Brazil - November 17th, 2009

The majority of the land visible in this FAPAR image of Brazil near the mouth of the Amazon River, is part of the states of Amapá (west of the river) and Pará (east of the river). The habitat of both states is mostly tropical rainforest. The State of Amapá has the lowest rate of loss of its original vegetation of any Brazilian state: only 2%.

In FAPAR images, the color spectrum over land runs from red (1.0), to green, to yellow and white (0.0), while bodies of water, such as the Amazon River, appear blue. Green to dark red areas indicate the presence of good to high photosynthetic activity, while white to yellow areas indicate none to low activity. Some cloud-covered patches, however, do appear white as well.

Vegetation Index Around the Chari River, in Chad and the Central African Republic

9.1N 18.3E

December 17th, 2009 Category: Climate Change

Chad and Central African Republic - November 19th, 2009

Chad and Central African Republic - November 19th, 2009

The Chari or Shari River, a 949-kilometer-long river of central Africa, flows from the Central African Republic (below) through Chad (above) in this FAPAR image. The watershed of the river covers 548,747 km².

FAPAR is an abbreviation for Fraction of Absorbed Photosynthetically Active Radiation, which provides information on the planet’s vegetation index. In such images, the color spectrum over land runs from red (1.0), to green, to yellow and white (0.0), while bodies of water appear blue.

This image shows that the land around the river and to its south, in the Central African Republic, is more photosynthetically active (green) than the land in Chad, which appears yellow to white as one moves northward towards the arid belt of the Sahel.

Vegetation Index of Thailand and Southern Myanmar

December 16th, 2009 Category: Climate Change

Myanmar and Thailand - November 29th, 2009

Myanmar and Thailand - November 29th, 2009

This FAPAR image focuses on southern Myanmar (west) and Thailand (east), both of which share the northern half of the long peninsula stretching through the center. FAPAR stands for Fraction of Absorbed Photosynthetically Active Radiation, which corresponds to the vegetation index of the area.

Most of the peninsula and land north of it appear red to dark green, an indication of high photosynthetic activity. The eastern part of Thailand, in the upper right quadrant, however, appears yellow, indicating low activity.

Vegetation Index of the Nile River Valley, Egypt

30.0N 31.2E

December 13th, 2009 Category: Rivers

Egypt - November 26th, 2009

Egypt - November 26th, 2009

The fertile Nile River Valley stands out against the surrounding sparsely vegetated Sahara Desert in this FAPAR image of Egypt and the Sinai Peninsula. The Fraction of Absorbed Photosynthetically Active Radiation of such images corresponds to the vegetation index of a given zone.

Most of the Nile River Valley and Delta appears green, ranging between 0.4 and 0.8 on the spectrum of photosynthetic activity,  while the surrounding desert areas show values between 0.0 and 0.2, indicating very low activity. Upon opening the full image, the Nile River can be seen continuing south to Lake Nasser, which shows no signs of vegetation around it.