<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML dir=ltr><HEAD><TITLE>[Proj] Terminology for origins</TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16674" name=GENERATOR></HEAD>
<BODY>
<DIV dir=ltr align=left><FONT face=Arial>Clifford J Mugnier<SPAN
class=259515106-06102008> wrote ( <SPAN class=259515106-06102008><A
href="http://lists.maptools.org/pipermail/proj/2008-October/003865.html">http://lists.maptools.org/pipermail/proj/2008-October/003865.html</A> ):</SPAN></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=259515106-06102008><FONT face=Arial
size=3></FONT></SPAN></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Tahoma><FONT size=2><SPAN
class=259515106-06102008><FONT face=Arial size=3>> In North
Africa, several of the Grids also have a False Northing at the False Origin
in order to avoid negative northings.</FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=3><SPAN
class=259515106-06102008>> </SPAN>Really!</FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=3><SPAN
class=259515106-06102008>> </SPAN>:-)<SPAN
class=259515106-06102008> </SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3>Sorry, I don't understand. In what sense are you using the term
"False Origin" here? </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3>If you are using it as EPSG does (at least for Lambert Conformal Conic
2SP </FONT></SPAN></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=3><SPAN
class=259515106-06102008><FONT>and Polar Stereographic Variant C),
</FONT></SPAN><SPAN class=259515106-06102008><FONT>then your statement is not
surprising, since </FONT></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=3><SPAN
class=259515106-06102008><FONT>that's how </FONT></SPAN><SPAN
class=259515106-06102008>such a False Origin works: it does have a False
Northing and a </SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT size=3>False
Easting. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3>If you are using it in the other sense, as the point where False Easting
and False Northing</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3>are both zero, then your statement is contradictory (that's a little too
surprising). </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3>So, you must be using the term "False Origin" in some third, more general
way. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><FONT face=Arial><FONT size=3><SPAN
class=259515106-06102008><FONT>Could you give a concrete </FONT></SPAN><SPAN
class=259515106-06102008>numerical example? </SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=259515106-06102008><FONT face=Arial
size=3>Best regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left></SPAN></FONT></FONT><FONT size=2></FONT> </DIV>
<DIV dir=ltr align=left><FONT size=2>--<BR>Mikael Rittri<BR>Carmenta AB<BR>Box
11354<BR>SE-404 28 Göteborg<BR>Visitors: Sankt Eriksgatan 5<BR>SWEDEN<BR>Tel:
+46-31-775 57 37<BR>Mob: +46-703-60 34
07<BR>mikael.rittri@carmenta.com<BR>www.carmenta.com</FONT> </DIV></BODY></HTML>