When I worked with ArcMap, I had no problem with choosing projection
ArcMap has a large number of predefined projections organized by world, continent, and country. You can navigate quickly to appropriate projections for any part of the world.
My current employer did not buy ArcMap, but I still need to choose an appropriate projection for my tasks. For example, I have got a list of coordinates in degrees (WGS84). I need to define (for example)
- some distances in meters
- areas in square meters
So, I need to select appropriate projection, transform original coordinated to this projection, make calculation, and sometimes transform result back to WGS84.
For this purposes I need mechanism to select the appropriate projection. What is it?