Projection of Argentina

[Ito]

Hello list,

Need to work with a projection that MapInfo can not find the data I got are:

Plane Coordinate System: GK Argentina Buenos Aires

                PROJECTION: Transverse Mercator

                               FACTOR: 0.999998

                               MERIDIAN CENTRAL: -58.462700

                               LATITUDE OF ORIGIN: -34.629717

                               False Easting: 100000

                               TRUE NORTH: 100000

                               UNITS: meters

                GEODETIC MODEL

                               DATUM: Campo Inchauspe

                               ELLIPSOID: International 1924

                               SEMI AXIS MAYOR: 6378388

                               CRUSHING DENOMINATOR: 297

                COORDINATES LIMITS

                               PROJECTED OR LOCAL COORDINATES

                               Left: 93743.420121

                               Right: 111752.191591

                               Top: 111284.351817

                               Bottom: 91566.420223

please, can someone help me find the correct projection?

Best Regards,

Ezequiel

[Andrew Harfoot]

Hi Ezequiel,

Whilst MapInfo (8.5) doesn't have the exact coordinate system that you list below, it does have the Campo Inchauspe datum (available under the Longitude/Latitude coordinate system category), and from this you can create the system you want.

To define a custom coordinate system in MapInfo you need to edit the mapinfo.prj file found in the program install directory (here on my machine: C:\Program Files (x86)\MapInfo\Professional\MAPINFOW.PRJ) - you can create an edited copy of this in another directory and get MapInfo to use it instead of the original by configuring a Workgroup Directory in Options > Preferences > Directory Preferences, otherwise it is sensible to make a backup copy of the file before editing it as corrupting it could have serious consequences!

The mapinfo.prj file contains all the coordinate systems used by MapInfo, and a custom system is added by entering new rows. The syntax for creating a custom coordinate system is described in the MapInfo User Guide

The framework for a Transverse Mercator projection (the same as Gauss Kruger or GK) is as follows:
Projection Type, Datum, Units, Origin Lon, Origin Lat, Scale Factor, False Easting, False Northing, Bound MinX, Bound MinY, Bound MaxX, Bound MaxY,

For your system this would be:
8, 17,"m",-34.629717,-58.462700,0.999998,100000,100000,93743.420121,91566.420223,111752.191591,111284.351817

So you can add to following lines to your mapinfo.prj

"--- Argentinian Coordinate Systems ---"
"Longitude / Latitude (Campo Inchauspe)\p4221", 1, 17
"GK Argentina Buenos Aires (Campo Inchauspe)", 8, 17,"m",-34.629717,-58.462700,0.999998,100000,100000,93743.420121,91566.420223,111752.191591,111284.351817

The first row will create a new category for Argentinian Coordinate Systems, and then I have added the existing Geographic (Lat/Lon) system, followed by your new system.

Save the file and reopen MapInfo, and you should see the coordinate system listed.

Cheers,

Andy

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Andy Harfoot

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

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Fax:  +44 (0)23 8059 2849

www.geodata.soton.ac.uk