[gradsusr] Crop country boundary or masking an area - still not working

[Rafanoharana Serge Claudio]

Dear John,

Sounds very interesting but I have no experience at all in FORTRAN and on
how to implement the FORTRAN code to GrADS. I do have experience in C.

Regards,

Serge


On Mon, Sep 12, 2011 at 5:00 AM, Huddleston, John <
Huddleston at cira.colostate.edu> wrote:

>  Serge
>
> See http://www.ncl.ucar.edu/Document/Tools/ncl_convert2nc.shtml and
> convert your study area shapefile to a masking netCDF file.
>
> Then write a small C/FORTRAN application to read your input netCDF file
> and the masking netCDF and write out a new netCDF file where the area
> outside your study area is the missing "undef" value.
>
> John Huddleston
>
>  ------------------------------
> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] On
> Behalf Of Rafanoharana Serge Claudio [rafanoharana at gmail.com]
> *Sent:* Monday, September 12, 2011 1:27 AM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] Crop country boundary or masking an area - still
> not working
>
>  Dear Yaqiang,
>
> Thank you for your email. I will work on it and let you know ASAP.
>
> Best Regards,
>
> Serge
>
>
> On Sat, Sep 10, 2011 at 7:57 PM, Yaqiang Wang <yaqiang.wang at gmail.com>wrote:
>
>> You can use maskout function to crop your grid data. Or use basemap
>> script to 'crop' your figure.
>>
>> On Sat, Sep 10, 2011 at 11:57 PM, Rafanoharana Serge Claudio
>> <rafanoharana at gmail.com> wrote:
>> > Dear John,
>> >
>> > Thank you for your answer. I do have ogr2ogr and a shapefile of the
>> study
>> > area. Thank you anyway for the file.
>> > In your command, you only deal with .shp files, and ogr2ogr cannot be
>> used
>> > within GrADS.
>> > The problem is that I have a .nc file which contains a variable. I want
>> to
>> > clip this .nc file (but not a .shp file). I am not sure that ogr2ogr can
>> > deal with .nc format (I also tried but not working).
>> >
>> > Thanks,
>> >
>> > Serge
>> >
>> >
>> > On Fri, Sep 9, 2011 at 1:09 PM, Huddleston, John
>> > <Huddleston at cira.colostate.edu> wrote:
>> >>
>> >> Serge
>> >>
>> >>
>> >>
>> >> Attached is your study area shapefile (Study_Area.shp). Use ogr2ogr to
>> >> clip your data.
>> >>
>> >>
>> >>
>> >> You can get ogr2ogr from http://www.gdal.org/ogr2ogr.html or if on
>> Linux
>> >> use ‘apt-get install gdal-bin’.
>> >>
>> >>
>> >>
>> >> Use the following command:
>> >>
>> >>
>> >>
>> >> ogr2ogr -clipsrc Study_Area.shp output.shp Your_input_data.shp
>> >>
>> >>
>> >>
>> >> where Study_Area.shp is a shapefile in the attached zip file and
>> >> Your_input_data.shp is the shapefile you want to clip.
>> >>
>> >>
>> >>
>> >> John Huddleston, PhD
>> >>
>> >> Cooperative Institute for Research in the Atmosphere
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> From: gradsusr-bounces at gradsusr.org [mailto:
>> gradsusr-bounces at gradsusr.org]
>> >> On Behalf Of Rafanoharana Serge Claudio
>> >> Sent: Friday, September 09, 2011 12:59 PM
>> >> To: GrADS Users Forum
>> >> Subject: [gradsusr] Crop country boundary or masking an area - still
>> not
>> >> working
>> >>
>> >>
>> >>
>> >> Dear all,
>> >>
>> >> I've already posted this message before but I can't get it worked.
>> >> If any of you have any idea to crop the study area, please let me know.
>> >> One said that it is possible to grab a shapefile of the top part  and
>> fill
>> >> it with black (I guess he meant re-setting the value of the variable
>> covered
>> >> by this shapefile to 0). If you have any experience or any tips on how
>> to do
>> >> that, thanks in advance for your help.
>> >>
>> >> Kind regards,
>> >>
>> >> Serge
>> >>
>> >> ---------- Forwarded message ----------
>> >> From: Rafanoharana Serge Claudio <rafanoharana at gmail.com>
>> >> Date: Fri, Aug 26, 2011 at 7:53 AM
>> >> Subject: Crop country boundary
>> >> To: GrADS Users Forum <gradsusr at gradsusr.org>
>> >>
>> >>
>> >> Dear all,
>> >>
>> >> I would like to ask if there is a way to crop the data to a specific
>> area.
>> >> In GrADS, if we use 'set mpdset hires', we have the country boundary.
>> >> However for my case I only need the study area (please refer to the
>> attached
>> >> file).
>> >>
>> >> I found that http://www.diva-gis.org/datadown provides Grid data. Can
>> we
>> >> use the data from this Website to crop it or...?
>> >>
>> >> Thank you,
>> >>
>> >> --
>> >> Serge
>> >>
>> >>
>> >> --
>> >> Serge
>> >>
>> >> _______________________________________________
>> >> gradsusr mailing list
>> >> gradsusr at gradsusr.org
>> >> http://gradsusr.org/mailman/listinfo/gradsusr
>> >>
>> >
>> >
>> >
>> > --
>> > Serge
>> >
>> > _______________________________________________
>> > gradsusr mailing list
>> > gradsusr at gradsusr.org
>> > http://gradsusr.org/mailman/listinfo/gradsusr
>> >
>> >
>>
>>
>>
>> --
>>  *************************************************
>> Dr. Yaqiang Wang
>> Chinese Academy of Meteorological Sciences (CAMS)
>> 46, Zhong-Guan-Cun South Avenue
>> Beijing, 100081
>> China
>>
>> yaqiang.wang at gmail.com
>> **************************************************
>>
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>>
>
>
>
> --
> Serge
>
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>


-- 
Serge
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