On 9/17/2008 2:29 PM, Victor Homar wrote:
Thanks a lot for your suggestion but...
Can I do that using the/a land-sea information from the 'worldHires'
database (from mapdata)?
Yes, you use the map.where function to identify the location of the
points. If NA, it's out in the ocean somewhere. Some lakes and
interior seas will probably be identified by name. For example, here's
what I get when clicking on some regions in the world map:
> map("world")
> loc <- locator()
> loc
$x
[1] -47.35604 -150.58010 -114.14808 -86.82406
$y
[1] 33.67133 42.77815 62.20602 44.59951
> map.where(x=loc$x, y=loc$y)
[1] NA
[2] NA
[3] "Canada"
[4] "Great Lakes:Superior, Huron, Michigan"
I believe all of those locations were in the oceans (1 and 2) or lakes
(3 and 4).
Duncan Murdoch
Best,
VÃctor.
Greg Snow wrote:
After you have interpolated your data, replace the values in the areas of the o
cean with NA, then filled.contour will not plot in those areas.
Hope this helps,
-----Original Message-----
From: [EMAIL PROTECTED] [[2]mailto:[EMAIL PROTECTED]
project.org] On Behalf Of Victor Homar
Sent: Tuesday, September 16, 2008 9:54 AM
To: [EMAIL PROTECTED]
Subject: [R] Blank certain areas of a contour plot
Hi,
I'm interpolating a list of syncronous accumulated precipitation
observations collected over a number of raingauge stations sited over
land, over a regular lat/lon grid using akima's interp().
Then, I plot and locate geographycally the resulting field with a
filled.contour() and a call to map(). Everything is fine but I need to
"blank" (in Golden Surfer nomenclature) the areas of my domain that lay
over the sea, as I do not have observations there and structures are
completely artificial.
Is there any function out there that can use the mapsdata database to
"blank" the sea areas of my plot?
Otherwise, can anybody think of a shortcut to get a similar effect on
the final map (not showing the interpolated precipitation areas over
the
sea?
Thanks a lot in advance,
VÃctor.
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VÃctor Homar Santaner
Grup de Meteorologia
Edif. Mateu Orfila Tel: +34 971 17 1376
Universitat de les Illes Balears Fax: +34 971 17 3426
07122 Palma de Mallorca (SPAIN) Email: [EMAIL PROTECTED]
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-----------------------------------------------------------------------
VÃctor Homar Santaner
Grup de Meteorologia
Edif. Mateu Orfila Tel: +34 971 17 1376
Universitat de les Illes Balears Fax: +34 971 17 3426
07122 Palma de Mallorca (SPAIN) Email: [EMAIL PROTECTED]
Knowledge is contagious. Infect truth.
-----------------------------------------------------------------------
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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