Geocentric tiles structure

classic Classic list List threaded Threaded
2 messages Options
olegviz olegviz
Reply | Threaded
Open this post in threaded view
|

Geocentric tiles structure

Hi ,

What is the map geocentric tiles structure ?

Each tile has its own center and vertices are relative to its center .
But its seems that also something else that I"m missing .

On geocentric globe each tile has also some orientation matrix or everything related to 0,0,0 at the center
of the earth ?
gwaldron gwaldron
Reply | Threaded
Open this post in threaded view
|

Re: Geocentric tiles structure

That's right - each tile has a positioning matrix that positions the tile's local origin somewhere near the tile itself. This is necessary because the 32-bit precision of most GPUs is not sufficient to represent geocentric coordinates (for Earth).
Glenn Waldron / Pelican Mapping