This section of the manual describes the commands which enable and utilise the flagging of edited and deleted features in LITES2.
Those features which have been edited and deleted may be flagged as such in the FS entry, and then may be selected for finding, display or output.
Edited (or constructed) features may additionally have a "date of edit" attached to them which can be updated to today's date at the end of a LITES2 session.
NB. The edited features are flagged in the fourth word of the FS entry, which has been designated for customer use. At present Laser-scan programs which process IFF files may not preserve information stored in the fourth word. There is therefore a danger of the edit flags being cleared if the files are processed by programs other than LITES2.
If ENABLE FLAGS is set then on read in of the IFF file:- Edited and deleted flags are preserved. Deleted features may then be RECOVERed If FLAGS is disabled then:- Edited flags are cleared and deleted features are not read in. This is the default mode of operation and is also a means by which the entire file may be cleared of edit flags.
During editing operations, if ENABLE FLAGS is set then:- Deleted and edited (or constructed) features are flagged. Features may be selected for finding or drawing by means of their flags (ie. SELECT EDITED,SELECT DELETED,SELECT UNEDITED) If FLAGS is disabled then:- Deleted features only are flagged.
* SELECT OUTPUT * SELECT DELETED * WRITE DELFILE * SELECT ALL * SELECT EDITED * WRITE EDITFILE * SELECT ALL * SELECT UNEDITED * WRITE UNEDFILE * DESELECT OUTPUT
It should be noted that:-
If SELECT OUTPUT is not specified then if the FLAGS option is enabled before exiting:-
Deleted features are output (if specifically selected) with deleted flags preserved and edited features with edited flags preserved. If FLAGS is disabled then:- Deleted features are not output and edited flags are still preserved.
AC actype acdate eg. AC 110 870213 denotes a feature last edited on 13th February 1987
By default the AC type is 110 but can be specified by an optional argument to the ENABLE DATE command . If an AC type is specified which is different from the date ACs already existing in the IFF file then these will not be updated. Instead a new AC with the specified type will be added. It is advised, however, that customers should only use AC types which have been allocated by Laser-Scan.