Re: A question about Italy Map Projection.

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Max,

> Does any one have more information about the overlapping thing for =20
> Italy?=A0 Why should Italy have the overlapping region??

I don't know the specific answer, but this is a fairly common =20
occurrance in mapping.  Obviously, any real coordinate can be defined =20=

with respect to either (or any) zone.  So the "overlap" is more a =20
function of how the zones are used rather than anything mathematical.  =20=

The primary reason why Italy might use an overlap goes to how they =20
subdivide their internal regions, either for mapping purposes (e.g., =20
quadrangles may overlap zones) or for geopolitical purposes (e.g., the =20=

ROME region may fall in both zones but is predominantly in Zone 1, so =20=

they make Zone 1 the standard for all maps for that region).  Either =20
way, it is a non-technical decision.

cheers,
Todd
On Thursday, July 3, 2003, at 10:00 AM, Max Zhao wrote:

> Jerry,
> =A0
> Your information is exactly what I am looking for. I was thinking =20
> about getting the Easting and Northing
> for Longitude =3D12 assuming it is in the east zone using FALSE =
Easting =20
> =3D252000, and get another pair of Easting/Northing assuming it is in =20=

> the west zone using FALSE Easting =3D150000. Hopefully the first =
Easting =20
> (EMidline_West) is much larger than the second Easting =20
> (EMidline_East).=A0
> =A0
> Now when I want to calculate Lat/Lon from a pair of (E, N)=A0,=A0 I =
can =20
> determine which set of parameters to use by comparing=A0 E to the =20
> (EMidline_East+ EMidline_West)/2.
> =A0
> Does any one have more information about the overlapping thing for =20
> Italy?=A0 Why should Italy have the overlapping region??
> =A0
> Thanks,
> =
-----------------------------------------------------------------------=20=

> -------------------------------
> Max Zhao
> RM2D15, Building104
> Florham Park, NJ07932
> Phone: (973) 236-6493
> Fax:=A0=A0=A0=A0 (973) 236-6679
> =
-----------------------------------------------------------------------=20=

> -------------------------------
> =A0
> =A0
> =A0
>
> ----- Original Message -----
> From: Jerry Helfand
> To: [email protected]
> 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
> =A0
> Based on website, http://rmmcnt7.cr.usgs.gov/cscodes.htm=A0
> =A0
> Italy zones are divided thus:
> "[Italy]
> IT-W=A0=A0=A0=A0 =3D Italy, West Fuse, West of 12 degrees E
> IT-E=A0=A0=A0=A0 =3D Italy, East Fuse, East of 12 degrees E "
> Thus, you have to know which part of Italy you're working.=A0 Unless =
the =20
> False Easting at the central meridians differ enough, as Todd Jamison =20=

> said, x-y pairs would not be unique so some prior knowledge of =20
> geographic location is necessary.
> =A0
> Jerry Helfand=A0
> =A0
> =A0
>
> ----- Original Message -----
> From: Max Zhao
> To: [email protected]
> 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 =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]

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Max,=20


<excerpt><fontfamily><param>Arial</param><smaller>Does any one have
more information about the overlapping thing for Italy?=A0 Why should
Italy have the overlapping region??</smaller></fontfamily>

</excerpt>

I don't know the specific answer, but this is a fairly common
occurrance in mapping.  Obviously, any real coordinate can be defined
with respect to either (or any) zone.  So the "overlap" is more a
function of how the zones are used rather than anything mathematical.=20
The primary reason why Italy might use an overlap goes to how they
subdivide their internal regions, either for mapping purposes (e.g.,
quadrangles may overlap zones) or for geopolitical purposes (e.g., the
ROME region may fall in both zones but is predominantly in Zone 1, so
they make Zone 1 the standard for all maps for that region).  Either
way, it is a non-technical decision. =20


cheers,=20

Todd

On Thursday, July 3, 2003, at 10:00 AM, Max Zhao wrote:


=
<excerpt><fontfamily><param>Arial</param><smaller>Jerry,</smaller></fontfa=
mily>

=A0

<fontfamily><param>Arial</param><smaller>Your information is exactly
what I am looking for. I was thinking about getting the Easting and
Northing</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>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).=A0</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Now when I want to calculate
Lat/Lon from a pair of (E,
N)</smaller></fontfamily>=A0<fontfamily><param>Arial</param><smaller>,=A0
I can determine which set of parameters to use by comparing=A0 E to the
(EMidline_East+ EMidline_West)/2.</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Does any one have more
information about the overlapping thing for Italy?=A0 Why should Italy
have the overlapping region??</smaller></fontfamily>

=A0

<fontfamily><param>Arial</param><smaller>Thanks,</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>=A0

=A0

=A0


----- Original Message -----

<bold>From:</bold>
<underline><color><param>1999,1999,FFFF</param>Jerry =
Helfand</color></underline>

<bold>To:</bold>
=
<underline><color><param>1999,1999,FFFF</param>[email protected]</col=
or></underline>

<bold>Sent:</bold> Wednesday, July 02, 2003 11:32 PM

<bold>Subject:</bold> Re: [OSRS] A question about Italy Map Projection.


<smaller>I don't know the details of the zones for Italy, but I have a
comment</smaller>

=A0

<smaller>Based on website,
=
<underline><color><param>1999,1999,FFFF</param>http://rmmcnt7.cr.usgs.gov/=
cscodes.htm</color></underline>=A0</smaller>

=A0

<smaller>Italy zones are divided thus:</smaller>

<smaller>"</smaller>[Italy]

IT-W=A0=A0=A0=A0 =3D Italy, West Fuse, West of 12 degrees E

IT-E=A0=A0=A0=A0 =3D Italy, East Fuse, East of 12 degrees E "

<smaller>Thus, you have to know which part of Italy you're working.=A0
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.</smaller>

=A0

<smaller>Jerry Helfand=A0</smaller>

=A0

=A0


----- Original Message -----

<bold>From:</bold> <underline><color><param>1999,1999,FFFF</param>Max
Zhao</color></underline>

<bold>To:</bold>
=
<underline><color><param>1999,1999,FFFF</param>[email protected]</col=
or></underline>

<bold>Sent:</bold> Tuesday, July 01, 2003 3:37 PM

<bold>Subject:</bold> [OSRS] A question about Italy Map Projection.


<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]


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