2 ms·
Regardless of the east vs. north distinction, I find it very unnatural to have an increasing vertical coordinate correspond to a movement towards the earth, if
by couchand 13y ago
Regardless of the east vs. north distinction, I find it very unnatural to have an increasing vertical coordinate correspond to a movement towards the earth, if for no other reason that calling sea level zero and using mainly positive numbers above seems very convenient (for any vehicle except submarines).
- 7952 13y agoIf you are measuring sea depth it doesn't make sense to have a minus sign when most of your values will be negative. Also, it is important to remember that sea level is an entirely arbitrary concept that depends on your frame of reference. On nautical charts elevations are usually measured against the lowest tide level which will be different to the datum on GPS (for example).