contouring plus a colored field of same quantity

• To: visad-list@xxxxxxxxxxxxx, wier@xxxxxxxxxxxxxxxx
• Subject: contouring plus a colored field of same quantity
• From: Stuart Wier <wier@xxxxxxxxxxxxxxxx>
• Date: Tue, 07 Mar 2000 11:05:40 -0700

Again working through Ugo Taddei's VisAd tutorial, in section 3.5
(http://www.ssec.wisc.edu/~billh/tutorial/s3/Section3.html)

I am trying to modify the example program P3_05 to plot contours
of one color on a color-filled background map of the same quantity.

The program as given plots contours of temperature, and the contours
are colored according to the underlying elevation. I want to have one color
contours of temperature over a background colored by temperature value.

Commenting out the     "display.addMap( elevMap );"
I get white contours on a black background, which is fine.

then using (in place of tempIsoMap),
    tempMapRGB = new ScalarMap( temperature,  Display.RGB );
    display.addMap( tempMapRGB );

I get a colored field, colored according to temperature values. As expected.

So I think I shall plot white contours over the colored temperature
field, by using both tempIsoMap and tempMapRGB.  To my surprise
I get colored contours, and no colored field at all.  Why?

Why does adding a isocontour map means my surface gets
destroyed, when I simply wanted to have the isolines on top of the
surface?


Stu Wier



-- 
Stuart Wier                           UCAR Unidata Program Center
wier@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8659                              Boulder, CO 80307
Unidata Home Page                     http://www.unidata.ucar.edu/

• Follow-Ups:
  • Re: contouring plus a colored field of same quantity
    • From: Bill Hibbard