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Thanks, all. I appreciate the help!<br>
<br>
Robert<br>
<br>
On 5/21/2012 10:14 PM, Yaqiang Wang wrote:
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cite="mid:CABvomDUeKHvd3BuU97EbyaWsfFzs3yuYYxYnah_Mswfdx1ssyg@mail.gmail.com"
type="cite">
<pre wrap="">It's quite easy to make a maskout grid data for GrADS using MeteoInfo
from a polygon shape file with 'Output Map Data' tool. Sample figures
are attached. Hope it will be helpful.
On Tue, May 22, 2012 at 12:46 PM, Jeff Duda <a class="moz-txt-link-rfc2396E" href="mailto:jeffduda319@gmail.com"><jeffduda319@gmail.com></a> wrote:
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<pre wrap="">I agree with Yaqiang's suggestion. The trick with this is that you need to
have some additional information as to which lat/lon or which grid points in
your domain are considered to be within the California borders. Grads does
not have the intrinsic ability to do that. You'll have to supply your own
data. I'm sure it wouldn't be hard to find some data for this. Good luck.
Jeff
On Mon, May 21, 2012 at 7:45 PM, Yaqiang Wang <a class="moz-txt-link-rfc2396E" href="mailto:yaqiang.wang@gmail.com"><yaqiang.wang@gmail.com></a>
wrote:
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<pre wrap="">
You need to produce a maskout data first in which the values of grid
points inside California are positive and the others are negtive. Then
use 'aave' function to get area average.
On Tue, May 22, 2012 at 3:52 AM, rjmera <a class="moz-txt-link-rfc2396E" href="mailto:rjmera@coas.oregonstate.edu"><rjmera@coas.oregonstate.edu></a>
wrote:
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<pre wrap="">Hi, all. I've looked at some of the previous posts on this subject but I
wasn't sure if it covered what I wanted to do. What I'm trying to do is
to get area average for an irregular polygon. To be specific, the state
of California, for example. This would exclude other states in the
vicinity and the ocean. How should I proceed?
Robert
I'm using this version of grads:
Grid Analysis and Display System (GrADS) Version 2.0.a9.oga.1
Copyright (c) 1988-2010 by Brian Doty and the
Institute for Global Environment and Society (IGES)
GrADS comes with ABSOLUTELY NO WARRANTY
See file COPYRIGHT for more information
Config: v2.0.a9.oga.1 little-endian readline printim grib2 netcdf
hdf4-sds hdf5 opendap-grids,stn athena geotiff shapefile
Issue 'q config' command for more detailed configuration information
Loading User Defined Extensions table
</home/server/pi/homes/rjmera/grads/Contents/Linux/Versions/2.0.a9.oga.1/x86_64/gex/udxt>
... ok.
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<pre wrap="">
--
*************************************************
Dr. Yaqiang Wang
Chinese Academy of Meteorological Sciences (CAMS)
46, Zhong-Guan-Cun South Avenue
Beijing, 100081
China
<a class="moz-txt-link-abbreviated" href="mailto:yaqiang.wang@gmail.com">yaqiang.wang@gmail.com</a>
<a class="moz-txt-link-freetext" href="http://www.meteothinker.com">http://www.meteothinker.com</a>
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<pre wrap="">
--
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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