[OSRS-PROJ] why

[Gerald Evenden]

As pointed out in another response, the difference between lon_0 and
the longitude to be projected is about 32°---far outside the range
of elliptical transverse Mercator.

Keep the delta longitude within 5º.

On Jan 15, 2004, at 7:56 AM, Zhang Guo wrote:

> Hi,osrs-proj
>
> why ?
>
> 	
>  <20790> +proj=tmerc +lat_0=39.66666666666666 
> +lon_0=-8.131906111111112 +k=1.000000 +x_0=200000 +y_0=300000 
> +ellps=intl +pm=lisbon +units=m
>
> i
> use proj    +proj=tmerc +lat_0=39.66666666666666 
> +lon_0=-8.131906111111112 +k=1.000000 +x_0=200000 +y_0=300000 
> +ellps=intl +pm=lisbon +units=m
>
> 40 -10
> 6173267.02      -5732158.03
>
> then
>
> proj -I  +proj=tmerc +lat_0=39.66666666666666 
> +lon_0=-8.131906111111112 +k=1.000000 +x_0=200000 +y_0=300000 
> +ellps=intl +pm=lisbon +units=m
>
> the result is :
>
>
> 6173267.02 -5732158.03
> 39d44'58.08"E   10d5'12.587"S
	<snip>
_____________________________________
Jerry and the low riders: Daisy Mae and Joshua
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: text/enriched
Size: 1006 bytes
Desc: not available
Url : http://lists.maptools.org/pipermail/proj/attachments/20040115/ddcbb17e/attachment.bin