the landing angle depends on the kind of jump, speed, size, launch angle, distance and difference in height (a good stepup can even land perfectly on flat while step down will have quite steep landings ....)
in essence your landing should be a tangent to your flight trajectory, but in practical fashions, they're allways less steep since conditions may vary in the jump and you don't want to overshoot by a mile ....
this is a simplified drawing, ie. drag wasn't considered
let's say you build a table feature, so your takeoff and landing are on the same height, you can see that in theory takeoff and landing are equally steep....
for a stepup, let's say your jump is at 45°, the blue line, if you put your landing on x=60 distance and about y=28 high, you could have a flat landing and be perfectly fine :)
for stepdowns, lets take the purple graph, at x=55 , y= 45 is a cliffdrop, you can see, the further you jump, the steeper it gets, lets say your trajectory follows the purple graph, if you drop 45, you see that you have covered a distance of about 55 (x=110) and you're moving in a 60 ° angle, so in theory a 60° landing would be perfect....
http://c-stem.ucdavis.edu/overview/examples/projectile/projectiles.png
^^in case embedding fails
