Re: A question about Italy Map Projection.
"Max Zhao" <[email protected]> Wed, 2 Jul 2003 18:07:00 -0400
| Newsgroups | gmane.comp.gis.osrs |
|---|---|
| Message-ID | <019701c340e6$42f7fcf0$dcd2cd87@zhaopc> |
This is a multi-part message in MIME format. ------=_NextPart_000_0194_01C340C4.BBC2A850 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Todd, Thanks for your suggestion. I guess I should try your idea out. I also = had this idea. But someone said the 2 zones has some overlapping part. = The east zone is between 6deg, 27min, 08sec and 12deg, 27min, 08sec. = The west zone is between 11deg 57min 08sec and 18deg, 27min, 08sec. So = there is overlapping part between longitude of 11deg 57min 08sec and = 12deg, 27min, 08sec. Your suggestion made me rethink about the idea. Since their false = easting are set far and away. So even though the longitude are = overlapping. I might still be able to tell which zone it is by looking = at the Easting and Northing. I will try it out soon! Thanks, -------------------------------------------------------------------------= ------------------- Max Zhao RM2D15, Building104 Florham Park, NJ07932 Phone: (973) 236-6493 Fax: (973) 236-6679 -------------------------------------------------------------------------= ------------------- ----- Original Message -----=20 From: Todd Jamison=20 To: [email protected]=20 Sent: Wednesday, July 02, 2003 9:50 AM Subject: Re: [OSRS] A question about Italy Map Projection. Max,=20 While I am not familiar with the specific case of Italy's zones, I = believe that the answer lies in the false eastings values for your = coordinate. The zone definitions should result in unique coordinates for = any point within the country. I believe that the reason that the false = eastings are 1,500,000 and 2,520,000 is that this will force all = coordinates in zone one (within the country) to have an easting = >1,000,000 and those within zone 2 to have an easting > 2,000,000. I'm = not entirely sure of this, but you could try using this assumption to = convert a number of your points and see if they fall as expected (i.e., = on the italian landmass).=20 Good luck,=20 Todd On Tuesday, July 1, 2003, at 04:37 PM, Max Zhao wrote: 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 =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. =20 Max zhao = -------------------------------------------------------------------------= ----------------------------- Max Zhao RM2D15, Building104 Florham Park, NJ07932 Phone: (973) 236-6493 Fax: (973) 236-6679 = -------------------------------------------------------------------------= ----------------------------- Todd Jamison CEO Observera, Inc. http://www.observera.com 703-378-3153 FAX: 703-378-3166 mailto:[email protected] ------=_NextPart_000_0194_01C340C4.BBC2A850 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>Todd,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Thanks for your suggestion. I guess I = should try=20 your idea out. I also had this idea. But someone said the 2 zones has = some=20 overlapping part. The east zone is between 6deg, 27min, 08sec and = 12deg,=20 27min, 08sec. The west zone is between </FONT><FONT face=3DArial = size=3D2>11deg=20 57min 08sec and 18deg, 27min, 08sec. So there is overlapping part = between=20 longitude of 11deg 57min 08sec and 12deg, 27min, 08sec.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Your suggestion made me rethink about = the idea.=20 Since their false easting are set far and away. So even though the=20 longitude are overlapping. I might still be able to tell which = zone it=20 is by looking at the Easting and Northing. I will try it out = soon!</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><FONT face=3D"Times New Roman"=20 size=3D3>----------------------------------------------------------------= ----------------------------<BR>Max=20 Zhao<BR>RM2D15, Building104<BR>Florham Park, NJ07932<BR>Phone: (973)=20 236-6493<BR>Fax: (973) 236-6679</FONT><BR><FONT=20 face=3D"Times New Roman"=20 size=3D3>----------------------------------------------------------------= ----------------------------</FONT><BR></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> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <BLOCKQUOTE=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]">Todd=20 Jamison</A> </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 = 9:50=20 AM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [OSRS] A question = about=20 Italy Map Projection.</DIV> <DIV><BR></DIV>Max, <BR>While I am not familiar with the specific case = of=20 Italy's zones, I believe that the answer lies in the false eastings = values for=20 your coordinate. The zone definitions should result in unique = coordinates for=20 any point within the country. I believe that the reason that the false = eastings are 1,500,000 and 2,520,000 is that this will force all = coordinates=20 in zone one (within the country) to have an easting >1,000,000 and = those=20 within zone 2 to have an easting > 2,000,000. I'm not entirely sure = of=20 this, but you could try using this assumption to convert a number of = your=20 points and see if they fall as expected (i.e., on the italian = landmass).=20 <BR>Good luck, <BR>Todd<BR><BR>On Tuesday, July 1, 2003, at 04:37 PM, = Max Zhao=20 wrote:<BR><BR> <BLOCKQUOTE><?fontfamily><?param Arial><?smaller>I am working to = convert a=20 set of E&N coordinates in <B>Italy</B> back into latitude and = longitude.=20 I know there are tow zones (east zone and west zone) in Italy. The=20 projection method is: Transverse Mercator or Gauss Boaga. I also = know=20 the Roma 1840 Datum for the 2=20 = zones. <?/smaller><?/fontfamily><BR> <BR><?fontfamily><?param = Arial><?smaller>My=20 Question is: If I am given a pair of (E,N) coordinate, how can I = tell it is=20 in the east zone or it is in the west=20 zone?<?/smaller><?/fontfamily><BR> <BR><?fontfamily><?param = Arial><?smaller>I=20 would greatly appreciate if any body can help me with = this.<?/smaller><?/fontfamily><BR> <BR><?fontfamily><?param = Arial><?smaller>Max=20 zhao<?/smaller><?/fontfamily><BR><?fontfamily><?param = Arial><?smaller>---------------------------------------------------------= ---------------------------------------------<BR>Max=20 Zhao<BR>RM2D15, Building104<BR>Florham Park, NJ07932<BR>Phone: (973) = 236-6493<BR>Fax: (973)=20 = 236-6679<BR>-------------------------------------------------------------= -----------------------------------------<BR><BR><?/smaller><?/fontfamily= ></BLOCKQUOTE>Todd=20 Jamison CEO<BR>Observera, Inc. = http://www.observera.com<BR>703-378-3153 FAX:=20 = 703-378-3166<BR>mailto:[email protected]<BR></BLOCKQUOTE></BODY></HT= ML> ------=_NextPart_000_0194_01C340C4.BBC2A850-- ---------------------------------------- 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]