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Several of the most densely populated territories in the world are city-states, microstates and urban dependencies. The European Commission's Joint Research Centre (JRC) has developed a suite of (open and free) data and tools named the Global Human Settlement Layer (GHSL) to improve the science for policy support to the European Commission Directorate Generals and Services and as support to the United Nations system. World environments map provided for comparison with maps above However, if Antarctica is excluded, then population density rises to over 58 per square kilometre (150/sq mi). This includes all continental and island land area, including Antarctica. However, if only the Earth's land area of 150,000,000 km 2 (58,000,000 sq mi) is taken into account, then human population density is 53/km 2 (140/sq mi).
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Commonly this is calculated for a county, city, country, another territory or the entire world. Population density is the number of people per unit of area, usually transcribed as "per square kilometer" or square mile, and which may include or exclude, for example, areas of water or glaciers. Main article: List of countries and dependencies by population density Human densities Population density (people per square kilometre) by country, 2006 Population density (people per square kilometre) map of the world in 2005
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