GEOGRAPHICLOCATION — Geographic Location

Assigns a coordinate system (EPSG code) to the drawing.

• Command: GEOGRAPHICLOCATION · Global name: _GEOGRAPHICLOCATION · Alias: GEO, NORTH, NORTHDIR
• Ribbon: Insert › Geolocation
• Ribbon: Mapping › Geolocation
• Menu: Insert
• Menu: Mapping

Assigns a coordinate system to the drawing, for example ETRS89 / UTM 30N. With it, the drawing knows which point on Earth each coordinate corresponds to: the status bar shows the cursor's latitude and longitude, and GEOIMAGE, MAPIMPORT, MAPEXPORT and GEOCOORD can reproject.

Usage

1. Enter GEOGRAPHICLOCATION (or GEO) or click the button. The Geographic Location dialog box opens and, at the same time, the command line asks.
2. Choose the system in the dialog box and click OK, or enter its code on the command line: the EPSG code (25830, 2154, 31983) or the AutoCAD code (ETRS89.UTM-30N, Lambert93).

In the dialog box, systems are grouped by country or region (click a group to expand it). To find one, type part of its EPSG code, its name or the country in Search (EPSG code, name or country): 2154, Lambert, France, UTM zone 19S.

Enter EPSG code of the coordinate system or [Remove/List] <…>:

Options

• Remove (R): removes the coordinate system from the drawing.
• List (L): lists the available systems, with their EPSG code, AutoCAD code and name.

Notes

• The drawing is assumed to be already drawn in coordinates of that system, as is usual in survey drawings. A drawing with local coordinates cannot be placed on a point of the map.
• It is saved the way AutoCAD saves it; if AutoCAD does not know the system, its full definition is saved.
• There are 303 systems: WGS 84 / UTM in every zone, ETRS89 (UTM 28N–38N and LAEA), the national systems of Europe (Lambert-93, PT-TM06, RD New, LV95, Lambert 72 and 2008, PL-1992, Gauss-Krüger, British National Grid, ITM…), Latin America (SIRGAS 2000, Mexico ITRF2008, POSGAR 2007, SIRGAS-Chile, MAGNA-SIRGAS…) and North Africa (Merchich, Nord Sahara 1959, Carthage, Egypt 1907, LGD2006). The full table and the accuracy of each datum shift are in Georeferencing.
• With ED50, a message tells how it is transformed to ETRS89: with the official IGN grid if it is installed or, otherwise, with 7 parameters (about 1.5 m of error).

See also

GEOCOORD · GEOIMAGE · MAPIMPORT · MAPEXPORT · Georeferencing