Re: A question about Italy Map Projection.
"Jerry Helfand" <[email protected]> Wed, 2 Jul 2003 22:32:24 -0500
| Newsgroups | gmane.comp.gis.osrs |
|---|---|
| Message-ID | <005c01c34113$b8928520$1d825e42@computer> |
This is a multi-part message in MIME format. ------=_NextPart_000_0059_01C340E9.CF0B7CA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I don't know the details of the zones for Italy, but I have a comment Based on website, http://rmmcnt7.cr.usgs.gov/cscodes.htm=20 Italy zones are divided thus: "[Italy] IT-W =3D Italy, West Fuse, West of 12 degrees E IT-E =3D Italy, East Fuse, East of 12 degrees E " Thus, you have to know which part of Italy you're working. Unless the = False Easting at the central meridians differ enough, as Todd Jamison = said, x-y pairs would not be unique so some prior knowledge of = geographic location is necessary. Jerry Helfand=20 ----- Original Message -----=20 From: Max Zhao=20 To: [email protected]=20 Sent: Tuesday, July 01, 2003 3:37 PM Subject: [OSRS] A question about Italy Map Projection. I am working to convert a set of E&N coordinates in Italy back into = latitude and longitude. I know there are tow zones (east zone and west = zone) in Italy. The projection method is: Transverse Mercator or Gauss = Boaga. I also know the Roma 1840 Datum for the 2 zones.=20 My Question is: If I am given a pair of (E,N) coordinate, how can I = tell it is in the east zone or it is in the west zone?=20 I would greatly appreciate if any body can help me with this. Max zhao = -------------------------------------------------------------------------= ----------------------------- Max Zhao RM2D15, Building104 Florham Park, NJ07932 Phone: (973) 236-6493 Fax: (973) 236-6679 = -------------------------------------------------------------------------= ----------------------------- ------=_NextPart_000_0059_01C340E9.CF0B7CA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT size=3D2>I don't know the details of the zones for Italy, but = I have a=20 comment</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Based on website, <A=20 href=3D"http://rmmcnt7.cr.usgs.gov/cscodes.htm">http://rmmcnt7.cr.usgs.go= v/cscodes.htm</A> </FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>Italy zones are divided thus:</FONT></DIV> <DIV><FONT size=3D2>"</FONT><FONT size=3D3>[Italy]<BR> = IT-W =20 =3D Italy, West Fuse, West of 12 degrees E<BR> = IT-E =3D=20 Italy, East Fuse, East of 12 degrees E "<BR></FONT></DIV> <DIV><FONT size=3D3><FONT size=3D2>Thus, you have to know which part of = Italy you're=20 working. Unless the False Easting at the central meridians differ = enough,=20 as Todd Jamison said, x-y pairs would not be unique so some prior = knowledge of=20 geographic location is necessary.</FONT></FONT></DIV> <DIV><FONT size=3D3><FONT size=3D2></FONT></FONT> </DIV> <DIV><FONT size=3D2>Jerry Helfand </FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2></FONT> </DIV> <BLOCKQUOTE dir=3Dltr=20 style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A [email protected] href=3D"mailto:[email protected]">Max = Zhao</A>=20 </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A = [email protected]=20 href=3D"mailto:[email protected]">[email protected]</A> = </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, July 01, 2003 = 3:37=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [OSRS] A question = about Italy=20 Map Projection.</DIV> <DIV><BR></DIV> <DIV><FONT face=3DArial size=3D2>I am working to convert a set of = E&N=20 coordinates in <STRONG>Italy</STRONG> back into latitude and = longitude. I know=20 there are tow zones (east zone and west zone) in Italy. The projection = method=20 is: Transverse Mercator or Gauss Boaga. I also know the Roma 1840 = Datum=20 for the 2 zones. </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>My Question is: If I am given a pair = of (E,N)=20 coordinate, how can I tell it is in the east zone or it is in the west = zone?=20 </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I would greatly appreciate if any = body can help=20 me with this.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Max zhao</FONT></DIV> <DIV><FONT face=3DArial size=3D2> <DIV><FONT face=3DArial=20 = size=3D2>----------------------------------------------------------------= --------------------------------------<BR>Max=20 Zhao<BR>RM2D15, Building104<BR>Florham Park, NJ07932<BR>Phone: (973)=20 236-6493<BR>Fax: (973)=20 = 236-6679<BR>-------------------------------------------------------------= -----------------------------------------</FONT></DIV></FONT></DIV></BLOC= KQUOTE></BODY></HTML> ------=_NextPart_000_0059_01C340E9.CF0B7CA0-- ---------------------------------------- Open Source Remote Sensing Project Discussion List To Subscribe: send a message to [email protected] with 'subscribe osrs' in the body To Unsubscribe: send a message to [email protected] with 'unsubscribe osrs' in the body To Report Problems: send a message to [email protected]