M2 - Coordinate Systems
This week we focused on learning projections and coordinate systems. This is the part that I tend to struggle teaching some of our field staff as I do not have full grasp on the subject itself. And that's why all maps are wrong because there is really no perfect projection as each projection comes with trade-offs in shape, land area, distance, direction and angle. For example, the Mercator is the widely known projection used in World maps and even Google Maps. It preserves direction (and that's why you use it for Google Maps) and shape but distorts distance and size (comparing Greenland to Africa). So the farther the country is to the equator the larger its size distortion. So if you'd like to have a map that correctly displays area, you would choose Gall-Peters or Equal-Area projection but it then distorts the country's shape. It really boils down on where you need to use it then those criteria will help you decide what projection to use. In part 5 of our lab exercise,...