There are lots of data sources available for map makers online. These data sources provides information on satellite imagery, topographical surveys, aerial photography, populations,natural features, etc. The information they provide is vital for the accuracy of a map. Some of these sources are;
<u><em>Natural Earth</em></u>: A public free domain that provides cultural, physical and basemap data.
<u><em>USGS Earth Explorer</em></u>: This data source provides an abundance of satellite and aerial imagery worldwide.
<u><em>Open Topology</em></u>: Gives access to a high spatial resolution topographic data and tools like LiDAR (Light Detection and Ranging) Data.
<u><em>UNEP Environmental Data Explorer</em></u>: This is a United Nations based data source. It provides useful data on population, forests, emissions, disasters and GDP of people and places.
<u><em>Global Map Github</em></u>: provides useful data on boundaries, drainage, transportation, population centers, elevation, land cover, land use and vegetation of places on earth.
<span>Fossil Fuels such as coal, oil, and natural gas were formed over millions of years by organic matter like plankton, plants and other life <span>forms!</span></span>
Nomadic travelers in central and east Asia were able to survive the harsh conditions of the tundras by adapting to the harsh environment that is engulfing the area or region. Also they keep moving with their hut or shelter and also may uses oxen for transportation and carrying logistics.
