how can i get the surface between to elevetion splines?

[psyfr3ak]

i have an elevetion map and i want to get the surface between tho level lines. i want know if there is any posibility to to this without define a region and get his propierties, becouse i have about 400 elevetion lines and other maps waiting :(

[rustysilo]

Maybe this (http://www.cadtutor.net/forum/showthread.php?t=8618&highlight=drape%2C+image) thread will help.