[Proj] OT: Geotrans's Neys Projection - Modified Lambert Conformal Conic
proj-admin at remotesensing.org
proj-admin at remotesensing.org
Mon Apr 19 19:23:57 EDT 2004
Hello,
Thanks for the the information. I have now found the document. It is
located in the users package. I was only using the developers package.
By the way, I have nothing against GeoTrans. It is more suitable for
a work I am doing now in .NET Framework. I easily ported it to C++
and then moved it to C# without any problem.
Best regard,
Paul.
----- Original Message -----
From: <proj-admin at remotesensing.org>
To: <proj at remotesensing.org>
Sent: Tuesday, April 20, 2004 7:56 AM
Subject: Re: [Proj] OT: Geotrans's Neys Projection - Modified Lambert
Conformal Conic
>
>
>
>
> When I downloaded my copy of GeoTrans from the NGA website and installed
> it, the documentation was in the "DOCS" subdirectory.
>
> You can contact me directly and I'll e-mail the document to you. It is a
> WORD document.
>
> Cliff Mugnier (cjmce at LSU.edu)
> LOUISIANA STATE UNIVERSITY
> -------------------------------------
> Please Sir,
> Where do I find this documentation? It does not seems to be in
> the library I downloaded.
>
> Best regards,
> Paul.
>
> ----- Original Message -----
> From: <proj-admin at remotesensing.org>
> To: <proj at remotesensing.org>
> Sent: Tuesday, April 20, 2004 3:07 AM
> Subject: Re: [Proj] OT: Geotrans's Neys Projection - Modified Lambert
> Conformal Conic
>
>
> >
> >
> >
> >
> > The GeoTrans documentation says:
> >
> > "A.1.25 NEY?S (MODIFIED LAMBERT CONFORMAL CONIC) PROJECTION
> > The Ney's (Modified Lambert Conformal Conic) projection is a conformal
> > projection in which the projected parallels are expanded slightly to
form
> > complete concentric circles centered at the pole. As shown in Figure
> A-27,
> > the projected meridians are radii of concentric circles that meet at the
> > pole. Ney's is a limiting form of the Lambert Conformal Conic. There are
> > two parallels, called standard parallels, along which the point scale
> > factor is one. One parallel is at either ¡Ó71 or ¡Ó74 degrees. The other
> > parallel is at ¡Ó89 59 59.0 degrees, depending on which hemisphere the
> first
> > parallel is in.
> > Ney's (Modified Lambert Conformal Conic) is used near the poles. Scale
> > distortion is small 25¢X to 30¢X from the pole. Distortion rapidly
> increases
> > beyond this.
> > The Easting\X and Northing\Y coordinates range from -40,000,000 to
> > 40,000,000.
> >
> >
> > "? 1st Standard Parallel ? A latitude value that specifies one of the
> > two the parallels where the point scale factor is 1.0. The 1st Standard
> > Parallel is either ?b71 or ?b74 degrees. The hemisphere of the Origin
> > Latitude determines the sign.
> >
> > ? 2nd Standard Parallel ? A latitude value that specifies one of the
> > two the parallels where the point scale factor is 1.0. The 2nd Standard
> > Parallel is fixed at ?b89 59 59.0 degrees. The hemisphere of the Origin
> > Latitude determines the sign."
> >
> > Other than these specifics regarding the choice for the Standard
> Parallels,
> > the Ney's Projection is a standard Lambert Conformal Conic in a secant
> > (POLAR) case.
> >
> > Note that: "Ney?s (Modified Lambert Conformal Conic) projection
> coordinates
> > consist of two fields labeled Easting/X and Northing/Y. The legal
values
> > for the Easting/X and the Northing/Y fields are optionally signed real
> > values, with up to three decimal places, in meters. The coordinates
must
> > designate a point that is located within the boundaries of the specified
> > Ney?s (Modified Lambert Conformal Conic) projection."
> >
> > Ney's Projection is a POLAR (aspect) Projection.
> >
> > GeoTrans does have its warts, but this explanation is crystal-clear to a
> > practitioner in the field.
> >
> > Cliff Mugnier
> > LOUISIANA STATE UNIVERSITY
> >
> > -----------------------------------
> >
> > I cannot find any reference to "Neys" projection in my references or
> > bibiography
> > listings.
> >
> > Snyder mentions some alternative Lambert Conics; one based upon "Gauss
> > projection." Perhaps using the conformal projection to the sphere?
> > But Neys
> > never appears in any index. Perhaps Russian, but the name does not
> > sound
> > like a Russian name.
> >
> > The NIMA GeoTrans stuff is completely incomprehensible so I was not able
> > to verify the location of any related material in the remotesensing
> > distribution.
> >
> > If anyone can supply a reference I would be glad to look into it.
> >
> > On Apr 18, 2004, at 9:24 PM, proj-admin at remotesensing.org wrote:
> >
> > > Hello All,
> > > Anyone familiar with the Neys projection found in the GeoTrans
package?
> > >
> > > It is stated as being a "Modified Lambert Conformal Conic", but I
> > > could not
> > > find any further information in my reference books or online.
> > > Or is there a more known name for this? Is this supported by proj4?
> > >
> > > Just any information on this will do.
> > >
> > > Best regards,
> > > Paul.
> > _____________________________________
> > Jerry and the low riders: Daisy Mae and Joshua
> >
> > _______________________________________________
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>
>
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