[ncl-talk] problem with GPCP data grid

[Barry Lynn]

Hello:

I believe that this is a standard grid.  Latitude(nlat) just means that the
variable name is latitude and there are nlat points.

It can be useful to use ncl and use PrintVarSummary after extracting the
variable you want to look at from the file.

For example:

lon = a->longitude

printVarSummary(lon)

On Sun, Jan 27, 2019 at 3:39 PM victor <mashibo321 at 126.com> wrote:

> I need some help with GPCP monthly data grid.
> The grid of data seems unusual. When I do ncdump -h, it output like below.
> I don't know how to deal with something like "latitude(nlat)"?
> Should I need to regriding? What should I do if I want to reshape the data
> to an usual one?
> ...
> variables:
>     float latitude(nlat) ;
>         latitude:long_name = "Latitude" ;
>         latitude:standard_name = "latitude" ;
>         latitude:units = "degrees_north" ;
>         latitude:valid_range = -90.f, 90.f ;
>         latitude:missing_value = -9999.f ;
>         latitude:bounds = "lat_bounds" ;
>     float longitude(nlon) ;
>         longitude:long_name = "Longitude" ;
>         longitude:standard_name = "longitude" ;
>         longitude:units = "degrees_east" ;
>         longitude:valid_range = 0.f, 360.f ;
>         longitude:missing_value = -9999.f ;
>         longitude:bounds = "lon_bounds" ;
>     float time(time) ;
>         time:long_name = "time" ;
>         time:standard_name = "time" ;
>         time:units = "days since 1970-01-01 00:00:00 0:00" ;
>         time:calendar = "julian" ;
>         time:axis = "T" ;
>     float lat_bounds(nlat, nv) ;
>         lat_bounds:units = "degrees_north" ;
>         lat_bounds:comment = "latitude values at the north and south
> bounds of each pixel." ;
>     float lon_bounds(nlon, nv) ;
>         lon_bounds:units = "degrees_east" ;
>         lon_bounds:comment = "longitude values at the west and east bounds
> of each pixel." ;
>     float time_bounds(nv, time) ;
>         time_bounds:units = "days since 1970-01-01 00:00:00 0:00" ;
>         time_bounds:comment = "time bounds for each time value" ;
>     float precip(nlat, nlon) ;
>         precip:long_name = "NOAA Climate Data Record (CDR) of Monthly GPCP
> Satellite-Gauge Combined Precipitation" ;
>         precip:standard_name = "precipitation amount" ;
>         precip:units = "millimeters/day" ;
>         precip:coordinates = "longitude latitude time" ;
>         precip:valid_range = 0.f, 100.f ;
>         precip:cell_methods = "precip: mean" ;
>         precip:missing_value = -9999.f ;
>     float precip_error(nlat, nlon) ;
>         precip_error:long_name = "NOAA CDR of GPCP Satellite-Gauge
> Combined Precipitation Error" ;
>         precip_error:units = "millimeters/day" ;
>         precip_error:coordinates = "longitude latitude" ;
>         precip_error:valid_range = 0.f, 100.f ;
>         precip_error:missing_value = -9999.f ;
> ...
>
>
>
>
>
>
> --
> ------------------------------------------------------------------------
> Shibo Ma(马世波)
> Graduate Student
> Department of Atmospheric and Oceanic Sciences
> School of Physics, Peking University
> No. 209 Chengfu Road, Beijing, China
> Email: mashibo321 at 126.com
> Tel : +86 18810507714
> ------------------------------------------------------------------------
>
>
>
>
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-- 
Barry H. Lynn, Ph.D
Senior Associate Scientist, Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581

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