Re: A question about Italy Map Projection.
"Jerry Helfand" <[email protected]> Fri, 4 Jul 2003 00:00:34 -0500
| Newsgroups | gmane.comp.gis.osrs |
|---|---|
| Message-ID | <005701c341e9$34c02960$77805e42@computer> |
This is a multi-part message in MIME format. ------=_NextPart_000_0054_01C341BF.4ABC01A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Max, More info (kids are asleep and aimless web surfing seems, well, = aimless...) : From website: http://www.opengis.org/techno/interop/EPSG2WKT.TXT which = I got from a HOTBOT search on "italy map system zone central meridian":=20 (Todd Jamison is right. Zone 1 Eastings will not overlap Zone 2 = Eastings unless one crosses the boundary between the two zones = (longitude =3D 12 ). You can even go further and assume that eastings = between 1,000,000 and 2,000,000 are in zone 1 and eastings between = 2,020,000 and 3,030,000 are in zone 2. Again, this should make sense = when looking at the map location of a given point.) PROJCS["Monte Mario (Rome) / Italy zone 1", GEOGCS["Monte Mario (Rome)", DATUM["Monte_Mario", SPHEROID["International 1924",6378388,297]], PRIMEM["Rome",12.4523333333333], UNIT["degree",0.0174532925199433]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",9], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",1500000], PARAMETER["false_northing",0], UNIT["metre",1]] EPSG=3D26592 PROJCS["Monte Mario (Rome) / Italy zone 2", GEOGCS["Monte Mario (Rome)", DATUM["Monte_Mario", SPHEROID["International 1924",6378388,297]], PRIMEM["Rome",12.4523333333333], UNIT["degree",0.0174532925199433]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",15], PARAMETER["scale_factor",0.9996], PARAMETER["false_easting",2520000], PARAMETER["false_northing",0], UNIT["metre",1]] EPSG=3D26632 ----- Original Message -----=20 From: Max Zhao=20 To: [email protected]=20 Sent: Thursday, July 03, 2003 9:00 AM Subject: Re: [OSRS] A question about Italy Map Projection. 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_0054_01C341BF.4ABC01A0 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>Max,</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>More info (kids are asleep and aimless web surfing = seems,=20 well, aimless...) :</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>From website: <A=20 href=3D"http://www.opengis.org/techno/interop/EPSG2WKT.TXT">http://www.op= engis.org/techno/interop/EPSG2WKT.TXT</A> =20 which I got from a HOTBOT search on "italy map system zone central = meridian":=20 </FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV><FONT size=3D2>(Todd Jamison is right. Zone 1 Eastings will = not overlap=20 Zone 2 Eastings unless one crosses the boundary between the two zones = (longitude=20 =3D 12 ). You can even go further and assume that eastings = between=20 1,000,000 and 2,000,000 are in zone 1 and eastings between 2,020,000 and = 3,030,000 are in zone 2. Again, this should make sense when = looking at the=20 map location of a given point.)</FONT></DIV> <DIV><FONT size=3D2></FONT> </DIV> <DIV>PROJCS["Monte Mario (Rome) / Italy zone 1",</DIV> <DIV>GEOGCS["Monte Mario (Rome)",</DIV> <DIV>DATUM["Monte_Mario",</DIV> <DIV>SPHEROID["International 1924",6378388,297]],</DIV> <DIV>PRIMEM["Rome",12.4523333333333],</DIV> <DIV>UNIT["degree",0.0174532925199433]],</DIV> <DIV>PROJECTION["Transverse_Mercator"],</DIV> <DIV>PARAMETER["latitude_of_origin",0],</DIV> <DIV>PARAMETER["central_meridian",9],</DIV> <DIV>PARAMETER["scale_factor",0.9996],</DIV> <DIV>PARAMETER["false_easting",1500000],</DIV> <DIV>PARAMETER["false_northing",0],</DIV> <DIV>UNIT["metre",1]]<BR>EPSG=3D26592</DIV> <DIV><BR>PROJCS["Monte Mario (Rome) / Italy zone 2",</DIV> <DIV>GEOGCS["Monte Mario (Rome)",</DIV> <DIV>DATUM["Monte_Mario",</DIV> <DIV>SPHEROID["International 1924",6378388,297]],</DIV> <DIV>PRIMEM["Rome",12.4523333333333],</DIV> <DIV>UNIT["degree",0.0174532925199433]],</DIV> <DIV>PROJECTION["Transverse_Mercator"],</DIV> <DIV>PARAMETER["latitude_of_origin",0],</DIV> <DIV>PARAMETER["central_meridian",15],</DIV> <DIV>PARAMETER["scale_factor",0.9996],</DIV> <DIV>PARAMETER["false_easting",2520000],</DIV> <DIV>PARAMETER["false_northing",0],</DIV> <DIV>UNIT["metre",1]]<BR>EPSG=3D26632<BR></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> Thursday, July 03, 2003 = 9:00=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> <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=20 for. 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=20 Easting (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=20 of (E, N)</FONT> <FONT face=3DArial size=3D2>, I can = determine which=20 set of parameters to use by comparing E to the (EMidline_East+=20 EMidline_West)/2. </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=20 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=20 have 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=20 size=3D3>[Italy]<BR>IT-W =3D Italy, West = Fuse, West of=20 12 degrees E<BR>IT-E =3D Italy, East Fuse, = East of 12=20 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=20 differ enough, as Todd Jamison said, x-y pairs would not be unique = so some=20 prior 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=20 Zhao</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> Tuesday, July 01, = 2003 3:37=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [OSRS] A question = about=20 Italy 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=20 projection method is: Transverse Mercator or Gauss Boaga. I also = know=20 the Roma 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=20 zone? </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I would greatly appreciate if any = body can=20 help 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></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_0054_01C341BF.4ABC01A0-- ---------------------------------------- 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]