GRDMASK

Section: Misc. Reference Manual Pages (l)
Updated: DATE
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NAME

grdmask - Create mask grdfiles from xy paths.  

SYNOPSIS

grdmask pathfiles -Gmask_grd_file] -Ixinc[m|c][/yinc[m|c]] -Rwest/east/south/north[r] [ -F ] [ -M[flag] ] [ -Nout/edge/in ] [ -V ] [ -: ]  

DESCRIPTION

grdmask reads one or more xy-files that each define a closed polygon. The nodes defined by the specified region and lattice spacing will be set equal to one of three possible values depending if the node is outside, on the polygon perimeter, or inside the polygon. The resulting mask grdfile may be used in subsequent operations involving grdmath to mask out data from polygonal areas.
pathfiles
The name of 1 or more ASCII files holding the polygon(s).
-G
Name of resulting output mask grd file.
-I
xinc [and optionally yinc] is the grid spacing. Append m to indicate minutes, c to indicate seconds. #include "explain_-R.txt"
 

OPTIONS

-F
Force pixel registration. [Default is grid registration].
-M
Multiple segment file. Segments are separated by a record whose first character is flag. [Default is '>'].
-N
Sets the values that will be assigned to nodes that are outside the polygons, on the edge, or inside. Values can be any number, including the textstring NaN [Default is 0/0/1]. #include "explain_-V.txt"
 

EXAMPLES

To set all nodes inside and on the polygons coastline_*.xy to 0, and outside points to 1, do

grdmask coastline_*.xy -R-60/-40/-40/-30 -I5m -N1/0/0 -Gland_mask.grd -V  

SEE ALSO

gmt, grdlandmask, grdmath, grdclip, psmask, psclip #include "refs.i"


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLES
SEE ALSO

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Time: 07:10:58 GMT, January 07, 2025