What different world maps get right - and what they get wrong

Image caption, The Mercator projection is the map widely used across the globe but inaccurately depicts the sizes of countries and continentsByJaroslav LukivPublished14 minutes agoThe UN has just called for the predominant world map to be replaced with one that more accurately reflects the true size of continents like Africa.The "Correct the Map" resolution adopted by the General Assembly aims to fix the discrepancy on the Mercator map, in which the African continent is shown as being of similar size to Greenland - even though it is in reality about 14 times larger.It adopted a new map, the Equal Earth projection, which better represents the true sizes of landmasses - but comes with problems of its own.There have been many prominent attempts over the years to solve the problem of accurately representing the surface of a sphere on a flat rectangle, each with its own benefits and drawbacks.Mercator mapImage source, Universal Images Group via Getty Images ImagesImage caption, The Mercator projection has been around since the 16th Century and was vital for navigating the oceansThe now widely used Mercator map was created in 1569 by Flemish cartographer Gerardus Mercator.Its main purpose was to help European sailors navigate the oceans, as cartography Professor James Cheshire at University London College explained."He wanted a straight line to be drawn on a map to look like a straight line in reality if you followed a compass bearing," he told the BBC. "That was what it was intended to do, and that's what it does brilliantly well."To keep those angles correct on a flat map, Mercator had to stretch the grid lines wider as they moved away from the equator toward the poles.His map accommodates for the curvature of the Earth by making countries near the equator seem much smaller than they are, with countries nearer the poles appearing stretched.The distortion is a result of it being impossible to accurately represent the surface of a globe on a two-dimensional chart.More than 450 years on, Mercator's creation is still the basis for many of the maps we see in classrooms, on TV and online, including Google Maps.But critics of the Mercator map say there is a psychological effect to viewing some places as smaller than they actually are and others as larger, as we instinctively view bigger things as more important.For Kenyan geographer Kioko Muendo, this has implicitly downplayed Africa's vast resources, population and investment opportunities."Maps are more than just guides for travellers - they shape how regions are perceived politically and economically," he told the BBC.Equal Earth mapImage caption, The Equal Earth map aims to represent landmasses' area more fairlyThe Equal Earth map aims to address this problem with the Mercator projection.It was developed by a team of cartographers in 2018 to present the size and shape of landmasses more accurately.As a result, the Equal Earth map was initially adopted by 54 members of the African Union, before being adopted by the UN.But to do this, it sacrifices the straight lines that made the Mercator projection perfect for navigating with - and it cannot be used for measuring the true distance between different places."You can preserve area, or you can preserve shape, or you can preserve distance and direction, but not everything at once perfectly, because otherwise you'd be back to a sphere," Cheshire said.Peters mapImage caption, The Peters map projection gives a fairer idea of land area but distorts shapeThe Peters world map was designed by German historian Arno Peters in the early 1970s. The rectangular map is based on the projection first described by Scottish cartographer James Gall in 1855.The projection sacrifices accuracy of shape in favour of accuracy of scale. So, polar regions are squished, while the bits near the equator are stretched. This fixes the Greenland-Africa size issue, allowing those who use it to get a sense of the comparative size of different landmasses, all while preserving straight lines of longitude and latitude.However, the map severely distorts the shapes of Earth's landmasses, making them all look slightly off.The straight lines on the Peters map do not represent true constant compass bearings and so are useless for navigation.Related topicsGreenlandUnited NationsAfricaMapsMore on this storyUN votes to adopt new world map to reflect Africa's true sizePublished13 hours ago