grdinfo - Get information about the contents of a 2-D grd file
grdinfo grdfiles [ -C ] [ -F ] [ -Idx[/dy] ][ -L1 ] [ -L2 ] [ -M ] [
-Tdz ] [ -V ] [ -f[i|o]colinfo ]
grdinfo reads a 2-D binary grd file and reports various statistics for
the (x,y,z) data in the grdfile. The output information contains the
minimum/maximum values for x, y, and z, where the min/max of z occur,
the x- and y-increments, and the number of x and y nodes, and [option-
ally] the mean, standard deviation, and/or the median, L1 scale of z,
and number of nodes set to NaN.
The name of one or several 2-D grd files.
No space between the option flag and the associated arguments.
-C Formats the report using tab-separated fields on a single line.
The output is w e s n z0 z1 dx dy nx ny [ x0 y0 x1 y1 ] [ med
scale ] [ mean std rms] [n_nan]. The data in brackets are out-
put only if the corresponding options -M, -L1, -L2, and -M are
used, respectively. If the -I option is used, the output format
is instead NF w e s n z0 z1, where NF is the total number of
grids read and w e s n are rounded off (see -I).
-F Report grid domain and x/y-increments in world mapping format
[Default is generic]. Does not apply to the -C option.
Report the min/max of the region to the nearest multiple of dx and dy,
and output this in the form -Rw/e/s/n (unless -C is set). -L1
Report median and L1 scale of z (L1 scale = 1.4826 * Median
Absolute Deviation (MAD)).
-L2 Report mean and standard deviation of z.
-M Find and report the location of min/max z-values, and count and
report the number of nodes set to NaN, if any.
-T Determine min and max z-value, round off to multiples of dz, and
report as the text string -Tzmin/zmax/dz for use by makecpt.
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
-f Special formatting of input and output columns (time or geo-
graphical data) Specify i(nput) or o(utput) [Default is both
input and output]. Give one or more columns (or column ranges)
separated by commas. Append T (Absolute calendar time), t (time
relative to chosen TIME_EPOCH), x (longitude), y (latitude), g
(geographic coordinate), or f (floating point) to each column or
column range item.
To obtain all the information about the data set in file
grdinfo -L1 -L2 -M hawaii_topo.grd
gmt(l), grd2cpt(l), grd2xyz(l), grdedit(l)
GMT4.0 1 Oct 2004 GRDINFO(l)
Man(1) output converted with