Re: [ferret_users] how to insert scale

[Hein Zelle <hein.zelle@xxxxxxxxxxxxx>]

Dear Dessy Berlianty,

> I would like to ask any help how to overlay a scale (from 0 - 1 km) in our plot image?
> I would really appreciate for any suggestion about it.

Could you tell us a little more about your plot?  What grid is your
data defined on?  (show grid my_variable)

If your data is defined on a grid which has km as units, then Ferret
will automatically plot the grid along the axis borders.
Alternatively you could draw a scale manually as Ryo Furue suggested.
You could do this, for example, like this:

! select 2 points in your map which are 1 km apart, in a location
  ! which is suitable for drawing the scale.  I will take (-8.5,-9.2) and
! (-7.5,-8.7) as an example, modify this according to your data and grid.

define axis /x=-10:10:0.5 my_x
define axis /y=-10:10:0.5 my_y

let pattern=sin(x[gx=my_x])+cos(y[gy=my_y])
shade /pal=dark_land_sea pattern

plot /vs/overlay/line/color=green/title="1 km" {-8.5, -7.5},{-9.2,-9.2}
! optional: add vertical "end" marks
plot /vs/overlay/line/color=green/nolab {-8.5,-8.5},{-9.3,-9.1}
plot /vs/overlay/line/color=green/nolab {-7.5,-7.5},{-9.3,-9.1}


You can use the label command to put the text "1 km" inside the plot
next to your scale, instead of below the plot using the standard legend.

Kind regards,

     Hein Zelle

-- 

Dr. Hein Zelle
Advisor Meteorology & Oceanography

Tel:    +31 (0)527-242299
Fax:    +31 (0)527-242016
Email:  hein.zelle@xxxxxxxxxxxxx
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