[ncl-talk] best way to overlay two color filled contour maps?

[xiaoming Hu]

I actually looked at those pages. See what I got               using my script of http://www.caps.ou.edu/micronet/YangYi/WRF_QTT/V3.7.1/wrfERA2d_Sichuan_forQTT_UCM_YSU.2014070912/plot_totalRain_daily_spatial.ncl
Apparently it is not as nice as               There are a few issues, 1. I need the two contour maps using different colormaps, one is gsdtol, the other is BlAqGrYeOrReVi2002. In the exemplary figure, the overlay is done not through Opacity setting, but setting the 1st color transparent.   If I set gsn_define_colormap(wks,"BlAqGrYeOrReVi200") , how can I make the fist used color transparent? 
ThanksXiaoming 

CC: ncl-talk at ucar.edu; xhu at ou.edu
From: shea at ucar.edu
Subject: Re: [ncl-talk] best way to overlay two color filled contour maps?
Date: Wed, 31 Aug 2016 17:11:20 -0600
To: yuanfangcan at hotmail.com

Did you look at the overlay page?
Applications/overlay.shtmlApplications/rgbacolor.shtml

Sent from my iPhone
On Aug 31, 2016, at 12:36 PM, xiaoming Hu <yuanfangcan at hotmail.com> wrote:




What is the best way to overlay two color-filled contour maps (like below) in NCl? 

    <overlay.png>     

Thanks
Xiaoming 
 		 	   		  
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