Obtaining Maximum Lat/Lon from GlobeCanvass

[aszilagyi]

I have seen this has been an issue in the past, but I have yet to see a solution to this problem. I am developing an application in which the user sees a globe, which they can rotate and zoom. As the view changes markers should appear and disappear based on the current view of the globe. I feel I need to know the maximum latitude and longitude so I know which markers to place, but I do not know how to compute that.

Currently, I have a WorldWindGLCanvas, with the current markers viewed in a RenderableLayer. Markers are to be created and removed from the layer as the user moves the globe view. Are there any objects that I can use to compute these values?

(Note: these can be estimates, they do not have to be exact. if there is a way to obtain rough values, that will work too)

[tag]

For the layers containing the markers, call setMinActiveAltitude() and setMaxActiveAltitude(). This will control display of the markers relative to the eye altitude.