Re: A question about Italy Map Projection.
"Max Zhao" <[email protected]> Thu, 3 Jul 2003 10:00:44 -0400
| Newsgroups | gmane.comp.gis.osrs |
|---|---|
| Message-ID | <01b701c3416b$7edec2a0$dcd2cd87@zhaopc> |
This is a multi-part message in MIME format. ------=_NextPart_000_01B4_01C34149.F7B2E3E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jerry, Your information is exactly what I am looking for. I was thinking about = getting the Easting and Northing for Longitude =3D12 assuming it is in the east zone using FALSE Easting = =3D252000, and get another pair of Easting/Northing assuming it is in = the west zone using FALSE Easting =3D150000. Hopefully the first Easting = (EMidline_West) is much larger than the second Easting (EMidline_East).=20 Now when I want to calculate Lat/Lon from a pair of (E, N) , I can = determine which set of parameters to use by comparing E to the = (EMidline_East+ EMidline_West)/2.=20 Does any one have more information about the overlapping thing for = Italy? Why should Italy have the overlapping region?? Thanks, -------------------------------------------------------------------------= ----------------------------- Max Zhao RM2D15, Building104 Florham Park, NJ07932 Phone: (973) 236-6493 Fax: (973) 236-6679 -------------------------------------------------------------------------= ----------------------------- ----- Original Message -----=20 From: Jerry Helfand=20 To: [email protected]=20 Sent: Wednesday, July 02, 2003 11:32 PM Subject: Re: [OSRS] A question about Italy Map Projection. 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_01B4_01C34149.F7B2E3E0 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 face=3DArial size=3D2>Jerry,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Your information is exactly what I am = looking for.=20 I was thinking about getting the Easting and Northing</FONT></DIV> <DIV><FONT face=3DArial size=3D2>for Longitude =3D12 assuming it is in = the east zone=20 using FALSE Easting =3D252000, and get another pair of Easting/Northing = assuming=20 it is in the west zone using FALSE Easting =3D150000. Hopefully the = first Easting=20 (EMidline_West) is much larger than the second Easting=20 (EMidline_East). </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Now when I want to calculate Lat/Lon = from a pair of=20 (E, N)</FONT> <FONT face=3DArial size=3D2>, I can determine = which set of=20 parameters to use by comparing E to the (EMidline_East+ = EMidline_West)/2.=20 </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Does any one have more information = about the=20 overlapping thing for Italy? Why should Italy have the overlapping = region??</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Thanks,</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> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial 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]">Jerry = Helfand</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> Wednesday, July 02, 2003 = 11:32=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [OSRS] A question = about=20 Italy Map Projection.</DIV> <DIV><BR></DIV> <DIV><FONT size=3D2>I don't know the details of the zones for Italy, = but I have=20 a 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=20 you're working. Unless the False Easting at the central = meridians differ=20 enough, as Todd Jamison said, x-y pairs would not be unique so some = prior=20 knowledge of 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=20 know there are tow zones (east zone and west zone) in Italy. The = projection=20 method is: Transverse Mercator or Gauss Boaga. I also know = the Roma=20 1840 Datum 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) = 236-6493<BR>Fax: (973)=20 = 236-6679<BR>-------------------------------------------------------------= -----------------------------------------</FONT></DIV></FONT></DIV></BLOC= KQUOTE></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_01B4_01C34149.F7B2E3E0-- ---------------------------------------- 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]