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Online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. NPScape United States Department of the Interior National Park Service NPScape is a landscape dynamics monitoring project that provides landscape-level data, tools, and evaluations for ...
QGIS is a geographic information system (GIS) software that is free and open-source. [2] QGIS supports Windows, macOS, and Linux. [3] It supports viewing, editing, printing, and analysis of geospatial data in a range of data formats. QGIS was previously also known as Quantum GIS.
[2] Although it is a public database, GADM has a higher spatial resolution than other free databases, [3] and also higher than commercial software such as ArcGIS. [4] Those sources are commonly use to complete data analysis with data visualisation such as data plots, choropleth map, etc. [5] [6]
DIVA-GIS is a free geographic information system software program used for the analysis of geographic data, especially species occurrence data. The software was first designed for application to the study of the distribution of plants, especially crop wild relatives such as wild potatoes.
Africa is the world's second-largest and second-most populous continent after Asia.At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surface area. [9]
Download QR code; In other projects ... Political map of the African continent as in 2011 ... Version 1.2 or any later version published by the Free Software ...
Sub-Saharan Africa is the area of the African continent which lies south of the Sahara. The Sahel region covers a belt of grasslands south of the Sahara stretching from Senegal to Sudan . The Sudan , slightly more humid and arable region lying below the Sahel.
The main drainage of the continent is to the north and west, or towards the basin of the Atlantic Ocean. [1] To the main African rivers belong: Nile (the longest river of Africa), Congo (river with the highest water discharge on the continent) and the Niger, which flows half of its length through the arid areas.