[ncl-talk] Land Mask

[Jake Huff]

Hello,

I found that the CERES.HiResLandSeaMask was useful in that it includes many
of the islands near the Caribbean that I was interested in. The only
problem I have now is that I need to compare that lat/lon grid to the one
from the International Best Track Archive for Climate Stewardship (IBTrACS)
which is on a tenth degree grid. Is there a way for me to transform the
CERES grid to match the IBTrACS?

I am attaching the code I am trying to use to get the grid I want (it is
from the landsea_mask example 5). The attached pdf shows what I get for
land in red on the first page and the second page is the original CERES
landsea mask, so I clearly have a problem somewhere with how I am
interpolating to the grid I want.

Thanks,
Jake

On Sun, Dec 18, 2016 at 11:45 AM, Dennis Shea <shea at ucar.edu> wrote:

> Maybe the following will help?
>
> I have placed several land-sea masks with different resolutions at:
>
> ftp ftp.cgd.ucar.edu
> anonymous
> email
> cd pub/shea/MASH
> prompt
> ls
> mget *
> quit
>
> /ftp/pub/shea/MASK
>
> -rw-r--r--        40074 Dec 18 09:35 CERES.HiResLandSeaMask.nc.gz
> -rw-r--r--      300535 Dec 18 09:39 land_ocean_lake_river_mask_pfv52.nc.gz
> -rw-r--r--          4558 Dec 18 09:31 lsmask.1x1_noaa_oi.nc.gz
> -rw-r-----  16201826 Dec 18 09:31 lsmask-world8-var.dist5.5.nc.gz
>
> On Sat, Dec 17, 2016 at 1:07 PM, Jake Huff <jake.huff at stonybrook.edu>
> wrote:
>
>> Hello,
>>
>> I am currently trying to create a high resolution land mask to include
>> the smaller islands in the Caribbean. I am using the mask_5.ncl example
>> script under the masking section. In the documentation, it discusses the 1
>> degree by 1 degree basemap found here:  *$NCARG_ROOT/lib/ncarg/data/cdf/landsea.nc
>> <http://landsea.nc>*
>>
>> I am attaching the script that I am currently using to create a 0.1x0.1
>> degree grid. It runs correctly, but I end up with the same land mask if I
>> plot the landmask from the basemap above. My new landmask is at the higher
>> resolution but smaller islands are not included. I think I need to increase
>> the resolution of the basemap as opposed to just increasing the resolution
>> of the landmask. I was wondering how I would go about creating a 0.1x0.1
>> degree basemap. I need the high resolution to determine if tropical
>> cyclones make landfall on the islands in the Caribbean, so I need to have
>> the islands show up as land and not ocean.
>>
>> Thanks for any help,
>>
>> Jake
>>
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>>
>
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