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grdclip

Langue: en

Version: 369040 (fedora - 01/12/10)

Section: 1 (Commandes utilisateur)

NAME

grdclip - Clipping of range in grid files.

SYNOPSIS

grdclip input_file.grd -Goutput_file.grd [ -Sahigh/above ] [ -Sblow/below ] [ -V ]

DESCRIPTION

grdclip will set values < low to below and/or values > high to above. Useful when you want all of a continent or an ocean to fall into one color or grayshade in image processing, or clipping of the range of data values is required. above/below can be any number or NaN (Not a Number). You must choose at least one of -Sa or -Sb.
input_file.grd
The input 2-D binary grid file.
-G
output_file.grd is the modified output grid file.

OPTIONS

-Sa
Set all data[i] > high to above.
-Sb
Set all data[i] < low to below.
-V
Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].

GRID FILE FORMATS

By default GMT writes out grid as single precision floats in a COARDS-complaint netCDF file format. However, GMT is able to produce grid files in many other commonly used grid file formats and also facilitates so called "packing" of grids, writing out floating point data as 2- or 4-byte integers. To specify the precision, scale and offset, the user should add the suffix =id[/scale/offset[/nan]], where id is a two-letter identifier of the grid type and precision, and scale and offset are optional scale factor and offset to be applied to all grid values, and nan is the value used to indicate missing data. When reading grids, the format is generally automatically recognized. If not, the same suffix can be added to input grid file names. See grdreformat(1) and Section 4.17 of the GMT Technical Reference and Cookbook for more information. When reading a netCDF file that contains multiple grids, GMT will read, by default, the first 2-dimensional grid that can find in that file. To coax GMT into reading another multi-dimensional variable in the grid file, append ?varname to the file name, where varname is the name of the variable. Note that you may need to escape the special meaning of ? in your shell program by putting a backslash in front of it, or by placing the filename and suffix between quotes or double quotes. The ?varname suffix can also be used for output grids to specify a variable name different from the default: "z". See grdreformat(1) and Section 4.18 of the GMT Technical Reference and Cookbook for more information, particularly on how to read splices of 3-, 4-, or 5-dimensional grids.

EXAMPLES

To set all values > 70 to NaN and all values < 0 to 0 in file data.grd:

grdclip data.grd -Gnew_data.grd -Sa70/NaN -Sb0/0 -V

SEE ALSO

GMT(1), grdlandmask(1), grdmask(1), grdmath(1), grd2xyz(1), xyz2grd(1)
"Breadth. Circle. Desert. Monarch. Month. Wisdom. (for which there are
No rhymes)" was just the title, and I only read that far.

That was because I felt like some old agent-of-the-Czar
When a plotter swims within the scope of his exertions,
And I was scared this hothead would start hedging his assertions
Before I had him dead-to-rights. (A Chekan's or a SMERSHian's
Lot, you know, is not a happy one.) He might retract.

A liar is a liar is a liar. That's his act.
But six distinct demonstrable defiances-of-fact
Before he hits line one? That's taking aim at the World's Record.
I wanted this quark-colored tangerine-flake double-deckered
Omnibus of absurdities to make it to the checkered
Flag. He started fast, but could he forge on? Was he s e r i o u s?

He had the Grand Prix style all right. Intense. Composed. Imperious.
And lies to burn. Poor lies, in no wise deep or deleterious.
He drove them home like thumb (or rather tooth nail fist and chin) tacks.
He planted Cosmic Glints to make you whimper for a glint-axe.
"Unconstellated words rain down...inexorable syntax"
Etcetera Etcetera.

It's not that I'd set up,
Like Carrie Nation beating back the drunkard from his cup,
To scourge the world of liars. I'd as soon be Offissa Pup.
I'd sooner hassle fetishists and call myself a bra-narc.

If I were Lord of All (or even constitutional monarch)
I'd send a Deluge down, with one-way tickets on the Non-ark
For lying priests and pedagogues. They make a feller's fez hurt.
But whom does Keats's whopper about corpulent Cortez hurt?
Or any poet's whopper? If he wants to say the Desert
Is made of pea-green camambert, hell, welcome to the circle.

We listen to a Bard the way a certain kind of jerk'll
Listen to the leaves or listen to a percolator perkle.
As long as he can grind em out, a dozen-or-so a month,
We'll praise him to the nth degree, and to the n-plus-1th.
He could have called the thing "Fifth. Sixth. Eighth. Ninth. Twelfth.
Baker's dozenth"
For all we care. We'll cheer him to the w-x-y-zedth
As long as his flimflammeries have brio and have breadth
And don't come on like nursery-nannies pushing early to bedth
To three-year-olds with jingles about Health and Wealth and Wisdom.

He should look out though. He might take himself in, and that is dumb.

Do that, and sure as malheur is the better part of Msdom,
Sententiousness will sidle in with snapshots in his wallet
To lay a little something on us camels: some small strawlet
Of Wisdom, say, or Beauty. Take this poem now. I call it
"Width. Rhombus. (see Lozenge.) Glacier. Despot. Fortnight. Bilge."
I t o l d myself: "No overkill. Go easy on the bilge."
But then. T u e u r is human. And what rhymes with bilge is bilge.

-- Starbuck, George