help with spheroid

Hello Grass Users,

Thank you for all your help in the past. I now have another
opportunity for you to help me understand GRASS (and probably the
GIS world) a little better.

My understanding is that a spheroid must be associated with a
location when the location is created in GRASS. What are the
advantages and disadvantages of selecting a spheroid at this time?

For example, am I limited to working within that spheroid for all
data in that location set?

If a database was initialized with one spheroid, clark66, can
it be switched to another spheroid, wgs84, without re-inputting the
vector and raster data?

Please bear with me as I gradually learn about the GIS world.
Feel free to respond to me directly.

Virginia Jackson
Engineering Research Associates
e-mail: jackson@era.com