Re: A question about Italy Map Projection.
Todd Jamison <[email protected]> Wed, 2 Jul 2003 09:50:43 -0400
| Newsgroups | gmane.comp.gis.osrs |
|---|---|
| Message-ID | <[email protected]> |
--Apple-Mail-7--610251658 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; delsp=yes; charset=ISO-8859-1; format=flowed Max, While I am not familiar with the specific case of Italy's zones, I =20 believe that the answer lies in the false eastings values for your =20 coordinate. The zone definitions should result in unique coordinates =20= for any point within the country. I believe that the reason that the =20= false eastings are 1,500,000 and 2,520,000 is that this will force all =20= coordinates in zone one (within the country) to have an easting =20 >1,000,000 and those within zone 2 to have an easting > 2,000,000. I'm = =20 not entirely sure of this, but you could try using this assumption to =20= convert a number of your points and see if they fall as expected (i.e., =20= on the italian landmass). Good luck, 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 =20= > latitude and longitude. I know there are tow zones (east zone and west = =20 > zone) in Italy. The projection method is: Transverse Mercator or Gauss = =20 > Boaga. I also know the=A0Roma 1840 Datum for the 2 zones.=A0 > =A0 > My Question is: If I am given a pair of (E,N) coordinate, how can I =20= > tell it is in the east zone or it is in the west zone? > =A0 > I would greatly appreciate if any body can help me with this. > =A0 > Max zhao > = -----------------------------------------------------------------------=20= > ------------------------------- > Max Zhao > RM2D15, Building104 > Florham Park, NJ07932 > Phone: (973) 236-6493 > Fax:=A0=A0=A0=A0 (973) 236-6679 > = -----------------------------------------------------------------------=20= > ------------------------------- > Todd Jamison CEO Observera, Inc. http://www.observera.com 703-378-3153 FAX: 703-378-3166 mailto:[email protected] --Apple-Mail-7--610251658 Content-Transfer-Encoding: quoted-printable Content-Type: text/enriched; charset=ISO-8859-1 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.=20 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: <excerpt><fontfamily><param>Arial</param><smaller>I am working to convert a set of E&N coordinates in <bold>Italy</bold> 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=A0Roma 1840 Datum for the 2 = zones.=A0</smaller></fontfamily> =A0 <fontfamily><param>Arial</param><smaller>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?</smaller></fontfamily> =A0 <fontfamily><param>Arial</param><smaller>I would greatly appreciate if any body can help me with this.</smaller></fontfamily> =A0 <fontfamily><param>Arial</param><smaller>Max zhao</smaller></fontfamily> = <fontfamily><param>Arial</param><smaller>---------------------------------= --------------------------------------------------------------------- Max Zhao RM2D15, Building104 Florham Park, NJ07932 Phone: (973) 236-6493 Fax:=A0=A0=A0=A0 (973) 236-6679 = --------------------------------------------------------------------------= ---------------------------- </smaller></fontfamily></excerpt>Todd Jamison CEO Observera, Inc. http://www.observera.com 703-378-3153 FAX: 703-378-3166 mailto:[email protected] --Apple-Mail-7--610251658-- ---------------------------------------- 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]