Re: masking

Hi Fernando,

There are a couple of ways to do this.

The easy way is to use mpFillAreaSpecifiers to indicate some bordering areas
around Colombia to fill in white:

  gres@mpFillAreaSpecifiers = (/"Venezuela","Brazil", "Peru","Ecuador"/)
  gres@mpSpecifiedFillColors = (/ "white", "white","white", "white"/)

I also set these resources:

  gres@mpFillOn = True
  gres@mpOceanFillColor = "white"
  gres@mpLandFillColor = "transparent"
  gres@mpInlandWaterFillColor = "white"

If you need the edges to match exactly, then the harder way is to
download shapefiles for Venezuela, Brazil, Peru, and Ecuador,
and fill all of these areas in white, pretty much using the same
code that you use to draw the Colombia outlines.

I will include a script for the "easy" way. I also created a second frame
and drew the locations where you have data, so you can see why the
contours look the way they do.

Finally, I decided to draw raster contours instead of the default "area fill"
contours. If you don't like this, set USE_RASTER to False.

--Mary

On Sep 19, 2011, at 5:30 AM, Luis Fernando Montana Roa wrote:

> Hi Mary,
> Sorry, I had forgotten to attach the script and data.
> I need to mask out all contours that are outside of Colombia shapefile.
>
> Best regards,
>
> Fernando
> <com_rf.ncl><pr-ene.txt><com_rf.png>
> From: Mary Haley <haley@ucar.edu>
> Date: September 18, 2011 4:54:24 PM MDT
> To: Luis Fernando Montana Roa <lfmontanar@unal.edu.co>
> Cc: ncl-talk@ucar.edu
> Subject: Re: masking
>
>
> Hi Fernando,
>
> It's hard to tell which part of this plot is from the shapefile, so I'm not sure which areas you want masked out.
> In the future, it would help if you could provide your script, and even better if you can provide your data too.
>
> Generally, if you want to mask out certain areas, the easiest thing to do is fill in these map areas with white.
> If your contours are going halfway through a country, however, it'
>
> See example "maponly_22.ncl" at:
>
> http://www.ncl.ucar.edu/Applications/maponly.shtml#ex22
>
> It shows how to use the mpFillAreaSpecifiers resource to specify which areas to fill in.
> You need to provide a corresponding mpSpecifiedFillColors resource to indicate which color
> you want for each area.
>
> --Mary
>
> On Sep 16, 2011, at 8:36 PM, Luis Fernando Montana Roa wrote:
>
>> Hi all, I need to mask all contours outside the shapefile.
>>
>> Any suggestions?
>>
>> Best regards,
>>
>> Fernando
>>
>> <com_rf1.png>_______________________________________________
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Received on Mon Sep 19 15:53:04 2011