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LAS\FIND /MASK [FileName]
Select observations according the given mask.
The file name should refer to a GDF file providing a 2D (position-posi-
tion) mask with <=0 or blank values (not selected), or >0 (selected) re-
al values. The spectra from the input index are selected according to
their position (lamof, betof) on the mask. Positions completely out of
the mask are not selected. Note that this command does not check the
consistency of the projection center, projection kind, and projection
angle (only offsets are used).
This option is best suited for use with the weight file (.wei) produced
by the command XY_MAP, in which zero weights are put where no data is
available. Using this weight file with FIND /MASK will thus ignore pix-
els/spectra with no data at all (all blank values).
Another possibility is to produce a custom mask from an image, e.g.
G\IMAGE myimage.gdf ! or mycube.lmv
G\SET BOX MATCH
G\POLYGON ! Define with cursor
G\MASK OUT ! Mask pixels OUT of the polygon
LET RG +1 /WHERE RG.NE.BLANKING ! Select pixels IN the polygon
G\WRITE IMAGE mymask.gdf ! Save into file
In this example the cursor is used to define the mask, but one can use
his own recipe to define the in/out rules.
The default for FileName is the FILE IN VLM cube name if any, with the
extension replaced by ".wei". Else, there is no default.