[gradsusr] Area average only for California

[Roberto Mera]

Thanks, all. I appreciate the help!

Robert

On 5/21/2012 10:14 PM, Yaqiang Wang wrote:
> 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<jeffduda319 at gmail.com>  wrote:
>> 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<yaqiang.wang at gmail.com>
>> wrote:
>>> 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<rjmera at coas.oregonstate.edu>
>>> wrote:
>>>> 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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>>>
>>>
>>> --
>>> *************************************************
>>> Dr. Yaqiang Wang
>>> Chinese Academy of Meteorological Sciences (CAMS)
>>> 46, Zhong-Guan-Cun South Avenue
>>> Beijing, 100081
>>> China
>>>
>>> yaqiang.wang at gmail.com
>>>
>>> http://www.meteothinker.com
>>> **************************************************
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>>
>> --
>> Jeff Duda
>> Graduate research assistant
>> University of Oklahoma School of Meteorology
>> Center for Analysis and Prediction of Storms
>>
>>
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