Edit Coordinate System Boundary Only

View and/or edit a coordinate system boundary only. A coordinate system boundaries defines the XY-coordinates in your maps. Coordinate systems are used by polygon, segment and point maps, and by the georeference of a raster map. It is advised to use one coordinate system for all the maps in your project.

A coordinate system boundaries can be used for maps for which you do NOT want to specify projection information. Specify the XY- coordinates for the boundaries of your coordinate system, i.e. the total extent of XY-coordinates which defines your study area. The boundary values will only be used to determine:

default map coordinate boundaries for vector maps, and
default coordinate boundaries for a georeference for raster maps.

This dialog box appears:

when in the Create Coordinate System dialog box, you selected to create a coordinate system of the type boundary only,
when in the Catalog, you double-click a coordinate system of the type boundary only,
when in the Catalog, you press the right mouse button on a coordinate system of the type boundary only and choose Open from the context-sensitive menu,
when from the Edit menu in the Main window, you choose Edit Object and subsequently you select a coordinate system of the type boundary only,
when from the Edit menu in the map window which uses a coordinate system of the type boundary only, you choose Coordinate System.

Dialog box options:

Description:	Type a description for the coordinate system. The description is visible on the status bar of the Main window when moving the mouse pointer over the coordinate system in the Catalog.
Min X, Y:	Type the minimum X-coordinate and the minimum Y-coordinate for this coordinate system. With the minimum XY-coordinate, the XY-coordinate of the lower left corner of the coordinate system is meant.
Max X, Y:	Type the maximum X-coordinate and the maximum Y-coordinate for this coordinate system. With the maximum XY-coordinate, the XY-coordinate of the upper right corner of the coordinate system is meant.

Tips:

When you work with multiple adjacent map sheets, it is advised to create one coordinate system in which the smallest minimum X and Y, and the largest maximum X and Y coordinates of all those map sheets are defined. Then, select this one coordinate system for all the maps you will create.
When digitizing one single map sheet out of many adjacent map sheets:

create one coordinate system in which all the coordinates of the different map sheets fit,
use this coordinate system for all your maps,
as the boundaries of each map, use the coordinates of each separate map sheet.

When you have imported vector maps comprising the same study area from other packages, you can create one proper coordinate system. You can then link this coordinate system to all imported maps of the area in the Coordinate System Properties sheet of the maps.
Once you have created a correct coordinate system, it is advised to make it read-only in the Coordinate System Properties sheet.