Contour Lines

Contour Lines

Return to topic list

Wed Feb 14 17:59:09 2018   by   Pedant
Just a query about the contour lines on the online generator–what elevation are they supposed to represent? Only it's a little unclear, and it could be important in working out the local climate...
 
Thu Feb 15 09:54:51 2018   by   Torben
Each contour line represents 5, 10 or 20 steps in the colour scale, so the distance in meters depends on the colour map.

Furthermore, the vertical scale on the maps is rather abstract, so even with a fixed colour map, you must apply your own conversion to meters.
 
Fri Feb 16 12:21:07 2018   by   Pedant
Hmm...any suggestions? I'm somewhat new to this...
 
Mon Feb 19 10:05:51 2018   by   Torben
Different colour maps have different numbers of colours, so a conversion to meters will require knowing the number of colours.

The Olsson colour map has 25 colour steps between sea level and the snow line.  At the equator, the snow line is approximately 4500 meters above sea level, so one colour step is roughly 4500/25 = 180 meters.  So using five colour steps per contour line will make them roughly 900 meters apart.

The Burrows colour map has 111 steps between sea level and the snow line, so there is roughly 40 meters between each step, so five steps per contour line gives 200 meters per contour line.

Note that the different colour maps are not consistent about at what height value the snow line is, so you will see snow line move as you change the colour map.

 
Thu Mar 1 14:47:56 2018   by   Pedant
That's...actually really helpful! Thank you! How about for Lefebvre?
 
Thu Mar 1 17:35:12 2018   by   Torben
Lefevbre has 145 steps between sea level and snow line.
 
Sat Mar 3 19:42:15 2018   by   Pedant
Many thanks again!
 

Return to topic list



New message:
Topic:
Posted by:

Type the values of the dice shown below:

Return to topic list