[OSRS-PROJ] why

[John Smart]

I can't comment on what's happening inside the program but I notice your
test point is very far away from your projection origin. Perhaps you're
specifiying longitude & latitude in reverse order? (proj likes to have lon
lat, not lat lon.) Your projection origin is approx 39N, 8W but your test
point is 40E, 10S. Perhaps you mean to have 40N, 10W.

I get this with proj:
-10 40
40464.07        338683.60

then this with proj -I:
40464.07        338683.60
10dW    40dN

John Smart


----- Original Message -----
From: "Zhang Guo" <guozhangchina at 21cn.com>
To: <osrs-proj at remotesensing.org>
Sent: Thursday, January 15, 2004 8:00 AM
Subject: [OSRS-PROJ] why


> 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
>
>
>
>
>
>
>
>
> Best regards,
> Zhang Guo
> School of Information Engineering in Remote Sensing,
> Wuhan University,
> #129 Luoyu road, Wuhan,
> P.R.China
> Mobile: +86-27-62086580
> Office: +86-27-87871114
> Email:guozhangchina at 21cn.com
>       guozhangchina at sina.com
>       zhangguo_wtusm at 163.com
> 　　　　　　　　　　2004-01-15
>
>
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