[GRASS5] GRASS, PROJ and NAD

[Hamish]

> 
> Here is the spearfishLL DEFAULT_WIND file:
> proj:       3
> zone:	    0
> north: 	    44:26N
> south:	    44:24:20N
> east:	    103:51W
> west:	    103:48W
> cols:	    129582          <--??
> rows:	    10
> e-w resol:  0:00:10
> n-s resol:  0:00:10
> 
> The cols value is surprising (to me). However, this is what the
> dialogue provides when defining spearfishLL:


The 'east' is actually west of 'west', so that the longitudinal extent wraps around the planet, for all but the 5km between the two!

129582 cols * 1/6 nmile = 21597.

$ gcb n 44.25N103.51W 44.25N103.44W
Short Path Bearing is 090 Degrees for 5 Nautical Miles
 Long Path Bearing is 270 Degrees for 21595 Nautical Miles


.. swap west and east ..


Hamish