This page contains informations and thoughts about some tags and how they will be handled.

== altitudeMode ==
 * clampToGround -> will be ignored, Z = 0 in OGR, #
 * relativeToGround -> Z in KML ==> Z in OGR, #
 * absolute -> Z in KML ==> Z in OGR, 100% match

# points aren't exactly the same because of curvature of ground

== !NetworkLink ==
With that you can include other KML files, so you can create on KML file and include 
vektors for streets, for rivers and one file with a raster.

Handling:
 * if the link is online, try to download
 * if download fails, look for the filename in the same directory
 * if that fails, too, warn the user and skip the !NetworkLink