[osg-users] osgdem: altitude value of the destination database

[Robert Osfield]

Hi Michael,

On 7/24/07, Welsch, Michael, HRD/AB <michael.welsch at mbda-systems.de> wrote:
> Ok, thanks. But one question remains:
>
> If I choose --cs "+proj=latlong +datum=WGS84" as target coordinate system, of which unit is then the z value ?
> Are there any further calculation that has to be done except the multiplication with the matrix to get the value?
>
> My goal is to get the z value as meters (mean sea level), while x/y should be long/lat...

In the case of x/y in long/lats the elevation is scale proportionally
to ensure that model is correct proportions so that effectively the
elevation is in degrees.

You really wouldn't want to look at a model that has x,y in degrees
and z in meters, it would look seriously out of kilter with massive
massive mountains for just little bumps.

Robert.