[gradsusr] How to output contour to a txt/dat file

[Mike Fiorino - NOAA Federal]

hi Jennifer -- I have a similar problem...  I can generate and display the shp file and the 'q shp' works as advertised, but what I really need are 
the actually lat(Y)/lon(X) of the vertices not just the bounds, e.g.,

37:  ArcM  parts=1  vertices=553  XBounds=0:360 YBounds=41.4058:74.4189  ZBounds=0:0  MBounds=5700:5700

tells me there are 553 vertices and that the lon bound is 0-360 and lat bound is 41.4-74.4.  do I have to use some GIS s/w to get the lat/lons? or is 
there a way to mod grads to output?

thanks!  best /R Mike

On 9/7/16 10:37 AM, Jennifer M Adams wrote:
> GrADS can write out the shapefile for you. Use ‘set gxout shp’ and ‘set shp’ to control the output. Documentation is at 
> http://cola.gmu.edu/grads/gadoc/shapefiles.html.
>
> ‘set gxout shp'
> ‘set shp -line shptest'
> ’set clevs 0’
> ‘d temp'
>
> —Jennifer
>
>
> On Sep 6, 2016, at 8:47 PM, Taixia <wutxcn at GMAIL.COM <mailto:wutxcn at GMAIL.COM>> wrote:
>
>> Thanks for your reply. Exactly.  I'd like get a *.shp file of the 0 contour's. It should be get the lat/lon of the contour's position first, and 
>> then using Arcgis software to generate the .shp file.
>>
>> On Wednesday, September 7, 2016, Jennifer M Adams <jadams21 at gmu.edu <mailto:jadams21 at gmu.edu>> wrote:
>> > I guess I did not fully understand the question. You have drawn the 0-degree temperature contour; what exactly do you want to output to a text 
>> file? The lat/lon of the contour’s position? —Jennifer
>> >
>> > On Sep 3, 2016, at 7:19 PM, Taixia <wutxcn at GMAIL.COM <mailto:wutxcn at GMAIL.COM>> wrote:
>> >
>> > Hi Jennifer,
>> > Thanks a lot for your reply.
>> > Problem still exists,forgive a Grads beginner. The data I used is the NECP 5 years average air temperature, I'd like get the zero degree 
>> temperature line. After "set clevs 0", I got the contours graphic (see attachment). But I still cannot get the output file as your steps. Could you 
>> please have a look at the attachments and help?
>> > ---Tim
>> > On Fri, Sep 2, 2016 at 7:20 PM, Jennifer M Adams <jadams21 at gmu.edu <mailto:jadams21 at gmu.edu>> wrote:
>> >>
>> >> After drawing a plot, you can check the contour levels used with ‘q shades’ or ‘q contours’. For line contours, the output looks like this 
>> (first column is color number, second column is contour value):
>> >> Number of levels = 11
>> >> 9 50000
>> >> 14 55000
>> >> 4 60000
>> >> 11 65000
>> >> 13 70000
>> >> 3 75000
>> >> 10 80000
>> >> 12 85000
>> >> 8 90000
>> >> 2 95000
>> >> 6 100000
>> >> If you want to write this to a file, here is a script fragment:
>> >> ‘q contours’
>> >> rc=write(“contourinfo.txt”,result)
>> >> rc=close(“contourinfo.txt”)
>> >> —Jennifer
>> >> On Sep 1, 2016, at 9:57 PM, Taixia <wutxcn at GMAIL.COM <mailto:wutxcn at GMAIL.COM>> wrote:
>> >>
>> >> Anybody knows how to output the contour value (such as set clevs 0) to .txt or .dat file (not graphic)? Thanks.
>> >> _______________________________________________
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>> >>
>> >> --
>> >> Jennifer Miletta Adams
>> >> Center for Ocean-Land-Atmosphere Studies (COLA)
>> >> George Mason University
>> >>
>> >>
>> >>
>> >>
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>> >>
>> >
>> > <air1115.nc <http://air1115.nc/>><snap.bmp>_______________________________________________
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>> > --
>> > Jennifer Miletta Adams
>> > Center for Ocean-Land-Atmosphere Studies (COLA)
>> > George Mason University
>> >
>> >
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>
> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
>
>
>
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