LOCK

Description

Prevents the contents of image channels in a PCIDSK file from being overwritten. Write-locked channels can still be read.

Parameters

Name	Type	Caption	Length	Value range
FILE *	String	Input file name	1 - 192
DBIC	Integer	Input raster channel(s)	0 -

* Required parameter

Parameter descriptions

FILE

Specifies the name of the PCIDSK file that contains the image channels to lock.

DBIC

Specifies the image channel(s) to lock.

If this parameter is not specified, all channels are locked.

Ranges of channels or segments can be specified with negative values. For example, {1,-4,10} is internally expanded to {1,2,3,4,10}. When you are not specifying a range in this way, only 48 numbers can be specified explicitly.

Details

LOCK prevents the contents of image channels in a PCIDSK file from being overwritten.

Specified image channels (DBIC) can be locked against writing. Write-locked channels can be read but cannot be overwritten. A write-locked channel may be used as input to any operation but cannot have an operation generated and saved to it. LOCK lets you protect specified channels (for example, the original raw data or completed results) from being accidently overwritten. Use UNLOCK to overwrite channels.

A PCIDSK file that does not have imagery channel headers cannot be locked. In such cases, LOCK generates a warning message.

Examples

Ensure that channels 1 through 6, and channel 10 in the file 'irvine.pix', which contain raw data, cannot be overwritten.

EASI>file	=	'irvine.pix'
EASI>dbic	=	1,-6,10

EASI>RUN LOCK

To make the results of your work available to other users without providing them with the ability to modify them, it is recommended that all image channels in the file be locked.

EASI>file	=	'results.pix'
EASI>dbic	=	

EASI>RUN LOCK