Hi -
Or, once you have read in the data, call the polymark script, which
takes care of the details of defining a polygon shape. It has a number
of pre-defined shapes: triangle, diamond, circle, star, etc.
yes? go/help polymark
will show you an example showing how to call the script.
Ansley
Jaison Kurian wrote:
Hi Steve
Guimond,
That can be easily done in Ferret with POLYGON
command.
Have a trial with the example given below (use the attached ascii
dataset,
scatter_data.dat). Please find the explanations in the example. If you
need
any clarifications please let me know.
With Regards
Jaison
!---------------scatter_data.jnl-------------------
\ cancel mode verify
!
! define axis & grid for reading the ascii file
!
define axis/y=1:80:1 yfile ; define grid/y=yfile fgrid
FILE/skip=1/grid=fgrid/var="lat,lon,temp" scatter_data.dat
! define the box/polygon corners for filling (should be a different
! axis than that of the variable's)
! increase dxp & dyp to increase the "box/polygon" size
let dxp=0.65 ; let bx=xsequence({`(-1)*dxp`,`dxp`,`dxp`,`(-1)*dxp`})
let dzp=0.65 ; let bz=xsequence({`dzp`,`dzp`,`(-1)*dzp`,`(-1)*dzp`})
! set reg will lead to errors..so use /VLIM & /HLIM to select
desired region
! Please note that here the fill plot is actually made for whole data
so
! we need to fix /LEVELS to get resonable range for the color key.
polygon/hlim=40:110:5/vlim=-15:25:5/levels=(22,30,0.25)/set
bx+lon,bz+lat,temp
ppl title "My Scatter Plot"
ppl xlab "Longitude" ; ppl ylab "Latitude"
ppl fillpol
go land
!------------end of scatter_data.jnl----------------------------
On Thu, 23 Jun 2005, Steve Guimond wrote:
Ferret Clan:
I have a set of satellite data that is not on a regular lat/lon grid
and has variable deltas in lat/lon as well. The data looks something
like
this:
lat lon value
20.12 10.14 1320
20.45 10.60 1200
etc...
Is there a way to plot the value that I read in point-by-point
according
to the right lat/lon? An IDL routine creates a small shape and then
fills
that shape with an appropriate color correspoinding the the value at
the
right lat/lon position. How can this be accomplished in Ferret?
Thanks
Steve Guimond
Research Assistant
The Center for Ocean-Atmospheric Prediction Studies
lat lon temp
-12.25 65.4 27.54
-5.67 79.3 28.75
-7.02 70.4 28.41
-5.43 79.3 28.75
-6.90 78.0 28.62
-4.46 78.2 29.09
5.77 62.7 29.17
3.01 64.8 29.46
1.75 67.0 29.50
-1.59 68.4 29.13
4.04 51.5 25.92
2.86 52.2 26.07
7.91 51.8 25.60
1.00 50.9 26.89
0.53 47.1 25.92
-4.12 51.6 26.95
-6.01 47.2 26.16
-11.50 43.4 26.20
7.14 56.3 26.83
0.20 63.7 28.09
-0.03 54.2 27.27
-0.55 51.4 27.18
-4.07 47.1 27.35
-2.11 45.4 27.11
-1.96 58.5 24.93
-0.31 57.7 27.84
0.78 57.6 27.93
-4.30 51.7 27.43
-2.16 58.3 27.86
1.02 82.1 29.30
3.01 64.7 29.26
15.99 56.9 26.88
18.17 61.4 27.54
21.69 64.9 27.33
17.87 69.0 28.18
14.11 67.7 28.42
14.70 85.8 28.64
10.75 83.4 28.62
17.61 66.5 27.93
19.90 61.4 27.22
20.63 64.9 27.42
21.91 63.2 27.38
-4.22 80.3 28.95
-2.64 82.0 29.10
1.87 69.6 28.90
2.55 65.9 28.81
1.97 55.5 27.73
4.29 72.4 28.79
23.35 60.9 26.20
12.34 65.2 28.46
17.49 63.2 27.59
16.50 67.2 28.10
7.63 61.8 28.85
0.16 61.3 29.16
4.38 63.6 29.29
6.50 62.3 28.96
8.82 64.8 28.96
7.88 72.3 28.84
11.00 56.8 27.31
3.72 86.1 29.40
0.19 80.5 29.47
-3.13 67.2 29.38
12.73 84.0 28.79
13.00 88.6 28.90
14.74 91.0 28.93
10.04 88.9 28.78
9.51 92.0 28.69
5.12 89.1 28.74
13.25 65.6 28.14
12.45 66.7 28.41
-6.51 92.7 29.55
-1.29 85.4 21.35
-12.28 101.5 26.65
-5.07 90.9 28.87
-4.93 94.5 29.03
-5.87 99.0 28.99
-4.65 90.7 29.19
-7.59 95.2 28.46
-3.16 88.1 29.01
1.97 91.6 29.29
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