[GRASS5] GRASS, PROJ and NAD
hamish_nospam at yahoo.com
Mon Oct 13 06:28:10 EDT 2003
> 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 ..
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