Set Linear Scale

The Set Linear Scale command attaches a linear coordinate system to the X and Y axes of the image. The scale is equally applied to both the X axis and Y axis. To set independent linear scales, use the Set Independent Linear Scales command. Keywords that define the calibration coefficients are inserted into the image header by this command. Also see the Calibrate Linear Scale command to interactively set a linear scale based on a mouse-drawn line.

The Set Linear Scale command opens from the Image Window > Coordinates menu and button on the Main Toolbar. The "immediate" form, shown first, opens when an image or image set is displayed in the top-most window. The general form can be used to select source images from folders, windows, or by matching templates.

Set Linear Scale Properties
Profile [\|>]	Selects the parameter profile for this command and allows you to save or work with existing presets.
[Select]	Opens the Select Source Images dialog to choose images from an image window, folder, files, name template, or a Mira File List.
Scale	Enter the value in linear units per pixel.
Coordinate Unit	Specify the units to be attached to this coordinate system.

This command applies a World Coordinate System ("WCS") calibration to the image or image set to replace any existing WCS. The new calibration may be reversed using Edit > Undo (Ctrl+Z) to restore the previous coordinate system. To permanently save the arcsecond calibration to the image file, save the image in the normal way.

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