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Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It shares its southeastern border with Liberia, and the northern half of the nation is surrounded by Guinea. Covering a total area of , Sierra Leone has a tropical climate, with diverse environments ranging from savanna to rainforests. The country has a population of 7,092,113 as of the 2015 census. Freetown is the capital and largest city. The country is divided into five administrative regions, which are subdivided into 16 districts. Sierra Leone is a presidential republic with a unicameral parliament and a directly elected president. Sierra Leone is a secular nation with the constitution providing for the separation of state and religion and freedom of conscience (which includes freedom of thoughts and religion). Muslims make up about three-quarters of the population, though with an influential Christian minority. Religious tolerance in the West African nation is very high and is generally considered a norm and part of Sierra Leone's cultural identity. The geographic area has been inhabited for millennia, but Sierra Leone, as the country and its borders are known today, was founded by the British Crown in two phases: first, the coastal Sierra Leone Colony in 1808 (for returning Africans after the abolition of slavery); second, the inland Protectorate in 1896 (as the Crown needed to establish more dominion inland following the outcome of the Berlin Conference of 1884–1885). Hence, the country formally became known as the Sierra Leone Colony and Protectorate or simply British Sierra Leone. Sierra Leone gained independence from the United Kingdom in 1961, becoming a Commonwealth realm as the Dominion of Sierra Leone with Sir Milton Margai of the Sierra Leone People's Party (SLPP) as the country's first prime minister. A new constitution was adopted in 1971, transforming the country into a presidential republic led by Siaka Stevens of the All People's Congress (APC).

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Sierra Leone

Africa

Africa is the world's second-largest and second-most populous continent, after Asia in both aspects. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surface area. With billion people as of , it accounts for about of the world's human population. Africa's population is the youngest amongst all the continents; the median age in 2012 was 19.7, when the worldwide median age was 30.4.

Liberia

Liberia (laɪˈbɪɹiə), officially the Republic of Liberia, is a country on the West African coast. It is bordered by Sierra Leone to its northwest, Guinea to its north, Ivory Coast to its east, and the Atlantic Ocean to its south and southwest. It has a population of around 5 million and covers an area of . The country's official language is English; however, over 20 indigenous languages are spoken, reflecting the country's ethnic and cultural diversity. The capital and largest city is Monrovia.

Biodiversity Mapping in a Tropical West African Forest with Airborne Hyperspectral Data

Francesco Giuseppe Miglietta, Qi Chen

Tropical forests are major repositories of biodiversity, but are fast disappearing as land is converted to agriculture. Decision-makers need to know which of the remaining forests to prioritize for conservation, but the only spatial information on forest biodiversity has, until recently, come from a sparse network of ground-based plots. Here we explore whether airborne hyperspectral imagery can be used to predict the alpha diversity of upper canopy trees in a West African forest. The abundance of tree species were collected from 64 plots (each 1250 m(2) in size) within a Sierra Leonean national park, and Shannon-Wiener biodiversity indices were calculated. An airborne spectrometer measured reflectances of 186 bands in the visible and near-infrared spectral range at 1 m(2) resolution. The standard deviations of these reflectance values and their first-order derivatives were calculated for each plot from the c. 1250 pixels of hyperspectral information within them. Shannon-Wiener indices were then predicted from these plot-based reflectance statistics using a machine-learning algorithm (Random Forest). The regression model fitted the data well (pseudo-R-2 = 84.9%), and we show that standard deviations of green-band reflectances and infra-red region derivatives had the strongest explanatory powers. Our work shows that airborne hyperspectral sensing can be very effective at mapping canopy tree diversity, because its high spatial resolution allows within-plot heterogeneity in reflectance to be characterized, making it an effective tool for monitoring forest biodiversity over large geographic scales.

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