Grads commands Flashcards
d tmp2m
visuallize the tmp2m parameters
d tmp2m -273.15
Visualizes the tmp2m parameter. This code is found from the command (q file) (-273.15 to change from K to C) this draws contours by default.
set gxout shaded
shows it shaded instead of contours
c
clear the screen
set lat 22.5 26.5
set the latitude
set lon 52 56.5
set longitude
set mpdset hires
set the map in high resolution
draw title temp CHART
give the map a title
cbar
set legend
set cint 2
change the interval to 2
d ugrd10m;vgrd10m
draw temperature vectors
d skip(ugrd10m,4);(vgrd10m)
draw wind vectors
set gxout barb
change wind to barb
set cthink 6
make the barbs look thicker
q dims
gives information about the dimentions
d pressfc/100
show isobars
d smth9(pressfc/100)
make isobars smoother
set ccolor 1
change color of isobars to 1
reset
start over the map
set lev 1000 10
set levels from 1000 to 10
printim (filename) (options)
print map
options in
printim (filename) (options)
- png
- . gif
- jpg
- black (use black background)
- white (use white background)
- . xNNN (horizontal size in NNN pixels)
- yNNN (vertical size in NNN pixels)
- –t NN (color number NN is transparent)
- –b bgImage (Image file bgImage included in the background of the output)
- xNNN (horizontal size in NNN pixels)
grads -lbc temp.gs
execute tmp.gs script
!ftp tgftp.nws.noaa.gov
enter the website
>!ftp tgftp.nws.noaa.gov
Name:
Password:
name: annonymous
password: @
set clevs 12 13 14 15 16 17 18 19 20
set levels for pallets
set ccols
set colors for pallets
set rgb 16 R G B
set a new color
how to take data from USB
df -h
1- Anything in linux is called a devise it is found is /dev/
(cd /dev/)
2- sdc is the flash drive
(mkdir /sample)
(mount /dev/sdc1 /sample)
(cd sample)
you will find all the data
how to eject USB
umount /sample
mag(u,v)
calculate wind speed
D sqrt(ugrd10m* ugrd10m+ vgrd10m* vgrd10m)
another way of finding the wind speed
d hcurl(ugrd10m,vgrd10m)
calculate vorticity
D (tmp2m-273.15)*9/5+32
change from C to F
in the script
ga-> set lon 54
ga-> set lev 1000 10
ga-> d tmpprs-273.15
x-bar is the
latitude not longitude
ga-> set t 6
ga-> set lat 24.5
ga-> set lon 54.5
ga-> set lev 1000 10
ga-> d rhprs
ga-> d tmpprs-273.15
the out put is
skew T diagram
temperature and humidity skew t diagram is done to
know the stability of the atmosphere
ga-> set lat 24.5
ga-> set lon 54.5
ga-> set lev 1000
ga-> set t 1 24
ga-> d tmp2m-273.15
is done to find
meteograms (time series)
how to find the magnitude of wind for the meteogram (time series)
d mag(ugrd10m,vgrd10m)*1.99
ga-> set lat 24.5
ga-> set lon 54.5
ga-> set t 1 24
ga-> set lev 1000 10
ga-> set gxout shaded
ga-> set cmin 40
ga-> d rhprs
ga-> set gxout barb
ga-> d ugrdprs*1.99;vgrdprs*1.99
ga-> set gxout contour
ga-> d hgtprs
ga-> cbarn
this is done to find
time height diagram
d tmp2m(t=12)-tmp2m(t=1)
accumulated fluxes
d ave(tmp2m-273.15,t=1,t=12)
temperature averages
For file in *.png ; do
Convert $file $(basename $file .png).gif
Done
Ls –rtl
Convert –loop -1 delay 25 *.gif toto.gif
Display toto.gif
animated gif
commmand line options
program grads [-lbpC] [-c ‘command’]
- -c ‘command’: execute ‘command’ when starting GRADs
- -b: run grads in batch mode. No graphics output window is opened
- -l: run grads in landscape mode. The orientation question is not asked.
- -p: run grads in portrait mode. The orientation question is not asked.
- -C: enable automatic setting of century for years <100
help:
gives a summery list of operations
set grads on | off
enable/disable display of the GRADs logo
set display <option>></option>
grey | greyscale
set the mode to greyscale
set display <option>></option>
color <black></black>
shading and contouring is done with rainbow colors. Default.
set grame <option></option>
on
plot a rectangleframe arounf clipped region
set grame <option></option>
off
plot no frame
set grame <option></option>
circle
plot a rectangle frame for lat-lon projection. plots a circular fram for a polar plot at the outermost latitude. Whole hemisphere plot only.
set background ic
set background color to color or color index ic
display expression
d expression
display data via the graphic output window; the simplest expression is a variable abbreviation
open filename
open descriptor file
close file#
close the last descriptor file opened
set dfile number
change to discriptor file number for current file
define var=expr
change new variable, which then can be used in subsequent expressions
undefine var
free the resources used by the defined variable
modify varname <time></time>
define variable, which is climatological. varname is the defined grid.
modify varname <time></time>
time types are:
seasonal: monthly or multi-monthly means
diurinal: over some time period less than a day
q config
list GRADs configuration information
q files
list open files
q file n
gives info on prticular file
q define
list currently defined variables
q dims
gives current dimention environment
q gxinfo
gives graphics environment info
q shades
gives colors and levels of shaded contours
q pos
waits for mouse click, return the position
q time
gives info about tume setting
q fwrite
print name of fwrite output file
q string s
gives the width of string s
set imprun script
automatically executes scriot before every display command
run file-name <params></params>
load and run a GRADs script (with parameters)
c events
clear event buffer
c graphics
clear graphics, not widgets
c hbuff
clear display buffer, when in double buffer mode
set x val1 val2
set x values or fix it to one value
set y val1 val2
set y values or fix it to one value
set z val1 val2
set z values or fix it to one value
set gxout errbar
error bar
set gxout fgrid
set specific value grib fill plot
set gxout findstn
find closest station to x,y point
set gxout line
line graph
set gxout linefill
color fill between two lines
set gxout model
plot station model
