[GRASS-user] Correctly Converting LL to LCC

[Rich Shepard]

On Tue, 29 Dec 2009, Glynn Clements wrote:

> Do you end up with feet? Or do you end up with metres but you're comparing
> against a reference given in feet? Your previous comment suggests the
> latter:

Glynn,

   Probably the latter.

> All of the built-in ellipsoids which can be selected by the +ellps=...
> option use metres. If you want proj or cs2cs to provide or receive
> coordinates in units other than those used when specifying the semi-major
> axis, you need to use the +to_meter=... option to specify the scale
> factor, e.g. +to_meter=0.3048 if you want units of 0.3048 metres (i.e.
> feet).

   This must be where I went off. The metadata tells me that the state uses
international feet so I need to have that translated to meters, or specify
in the location definition that the units are international feet.

> This is determined when you create the location.

   Your advice, please. Should I use the +to_meter conversion or specify all
distance units in international feet?

Thanks,

Rich