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Re: [ferret_users] Overlapping shape file. on my lat long grid.

Dear Anurag,

sorry, I can't help with explicit commands. THey do depend on your grid.

However, to explain a bit more - ferret will read text files and it writes nc files. So ferret is a convenient way to create nc files. 

Have a look in the ferret manual under masking to get an idea what I mean by a mask and how to apply it. Essentially, it is a map with 1s in your area of interest and 0s elsewhere. It allows you to cut to a shape in ferret.

The problem is to define the mask, if you have irregular shapes that cannot be described by a function.

Hence use the shapefile in a GIS - that is easy, but again I do not use GIS. You need to read the manual or do a google. It should be relatively straightforward to open s shp in a GIS and set up a variable using this.... Then export a text file from the GIS on your grid and read into ferret. THis is a bit trial and error until one gets it right.

You can ask more specific questions on the list, but seeing nobody has answered so far -maybe there is no easy way. I think, somebody else will reply if there is a better way.

Best wishes,


From: Anurag Kumar <anuragkumar048@xxxxxxxxx>
Sent: 26 March 2018 18:55
To: Kaduk, Jorg D. (Dr.)
Subject: Re: [ferret_users] Overlapping shape file. on my lat long grid.
Dear Joerg

Thanks for your response. However I have never used arc gis or ferret
before. I am a PhD student and very new to venturing this field. I
would like to know first how I can put a .shp file into the maps that
I am able to create using ferret. It seems like the first step would
be to convert the .shp file into a .nc file. But I am not getting any
help where I can convert the . shp to .nc. it would be great help if
you cacn tell me how I can convert the files first. then I think using
few commands I can try putting the boundary file .nc format over my

Thank you
Anurag Kkumar

On Mon, Mar 26, 2018 at 7:30 PM, Kaduk, Jorg D. (Dr.)
<jk61@xxxxxxxxxxxxxxx> wrote:
> Dear Anuarg,
> I guess, GIS methods do not translate straightforward into ferret.
> Unless somebody knows about a shapefile import my approach would be to create a mask in a GIS and import as a text file into ferret.
> This would entail defining your grid in the GIS and then creating a variable with the value of 1 within your region of interest and 0 outside. Export that variable as a text file and import into ferret using your grid definition.
> Just an idea. I have never done this. I do not work with GIS...
> Best regards,
> Joerg
> -----Original Message-----
> From: owner-ferret_users@xxxxxxxx [mailto:owner-ferret_users@xxxxxxxx] On Behalf Of Anurag Kumar
> Sent: 26 March 2018 07:44
> To: ferret_users@xxxxxxxx
> Subject: [ferret_users] Overlapping shape file. on my lat long grid.
> I have recently started working on ferret. I am working on climate data, However I am stuck at some point, so I would be needing help from ferret users.
> I want to overlap a shape file over my lat long grid. How can I do that?
> Problem that I am facing is the file that I have is in .shp format or .kml format. I dont know how to convert it into .nc. Also i dont know how I can put my study area map (that is .shp file) over my lat long grid. Once done, How can I remove the area outside my study area.
> Anurag Kumar


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