Technical Note: Creating an ILWIS segment map directly from a list of coordinates.
D G Rossiter
ITC Enschede
29-November-2001

Basic idea:

You will create a text file to contain the segments, with the
extension .LIN, following the the Arc/Info GENERATE format; then you
will import into ILWIS; then you will specify the coordinate system.

The format of a .LIN file is as follows
(see ArcInfo Help for topic GENERATE):

	ID		<-- segment ID, as in ILWIS segment editor
	X Y		<-- 1st point's coordinates;
			    note the spaces between coordinates!
	X Y		<-- 2nd point
	...     <- more points
	END		<- ends first segment
	...		<- other segments go here, beginning with the ID
			   and ending with the exact word END
	END     <- a final END at the very end of the file

Steps:

1. Make a text file (e.g. in Notepad) according to the above format.

(Note: if you have the X,Y coordinates already in an ILWIS table or
an Excel spreadsheet, export them as space-delimited to a text file
and then edit that file).

Example of one polygon, segment label '2'.  Note that the begin
and end points are the same.

	2
	230124 9912301
	230126 9912330
	230090 9912400
	230041 9912350
	230105 9912295
	230124 9912301
	END
	END


2. Import into ILWIS 3 with the ILWIS menu command:

	File | Import | format Arc/Info .LIN.

This has coordinates (as listed) but not yet a coordinate system.

3. In the catalog, select the imported object and change its
Properties to give it the correct Coordinate System.

4. This is now a georeferenced segment map.

For more information:

ILWIS Help:

ILWIS Window Types
-- Main Window
---- Menu Commands
------ File Menu
-------- Import
----------- Import map
--------------- Arc/Info .LIN, .PTS ASCII formats