[HOT] Contour lines overlay for remote mapping

[yvecai]

I figured out yesterday mapping Macenta that I had trouble understanding 
the way the area was build. It was my first mapping for HOT, and also my 
first mapping outside Europe.

Mapper could be interested to add this overlay on JOSM over the aerial 
to benefit from contour-lines :
tms:http://www.opensnowmap.org/opensnowmap-overlay/{zoom}/{x}/{y}.png
(source CGIAR-CSI SRTM V4.1 + ASTER beyond 60°N)

Ski pistes shouldn't disturb the mapper in the concerned area.

Yves - opensnowmap.org