[ncl-talk] Wrong values getting on contour plot
Arathy RP
arathyrparathy at gmail.com
Thu Jun 4 04:46:31 MDT 2020
here is the printvarsummary of variable f
Variable: f
Type: float
Total Size: 462720 bytes
115680 values
Number of Dimensions: 2
Dimensions and sizes: [g0_lat_1 | 241] x [g0_lon_2 | 480]
Coordinates:
g0_lat_1: [90..-90]
g0_lon_2: [ 0..359.25]
Number Of Attributes: 11
initial_time0_hours : 1873944
center : European Center for Medium-Range Weather Forecasts (RSMC)
long_name : Mean sea level pressure
units : Pa
_FillValue : 1e+20
level_indicator : 1
gds_grid_type : 0
parameter_table_version : 128
parameter_number : 151
forecast_time : 0
forecast_time_units : hours
And here is the printvarsummary of f_sub
Variable: f_sub
Type: float
Total Size: 14472 bytes
3618 values
Number of Dimensions: 2
Dimensions and sizes: [g0_lat_1 | 54] x [g0_lon_2 | 67]
Coordinates:
g0_lat_1: [ 0..39.75]
g0_lon_2: [60..109.5]
Number Of Attributes: 11
forecast_time_units : hours
forecast_time : 0
parameter_number : 151
parameter_table_version : 128
gds_grid_type : 0
level_indicator : 1
_FillValue : 1e+20
units : Pa
long_name : Mean sea level pressure
center : European Center for Medium-Range Weather Forecasts (RSMC)
initial_time0_hours : 1873944
(0) Mean sea level pressure (Pa) : min=99429.4 max=102977
On Thu, Jun 4, 2020, 12:04 PM Barry Lynn <barry.h.lynn at gmail.com> wrote:
> Hi:
>
> You need to reply to all, or they will get lost.
>
> What do you imply by "mean sea level pressure?" Do you imply that the
> pressure is averaged?
>
> It is not hard to find the minimum in an data field, so please just
> clarify and I will try to help you.
>
> It is hard for me to correct other people's code, but I can send you code
> that should work to identify the minimum sea level pressure, or at least
> help you to adapt your own.
>
> Barry
>
> On Thu, Jun 4, 2020 at 9:20 AM Arathy RP <arathyrparathy at gmail.com> wrote:
>
>> Hi,
>> Actually i want to get the minimum value for mean sea level pressure and
>> I didn't understand the purpose for defining area .
>> Can you please show an example.
>>
>> On Thu, Jun 4, 2020, 12:45 AM Barry Lynn <barry.h.lynn at gmail.com> wrote:
>>
>>> Hi:
>>>
>>> If you are plotting mean sea level pressure, you need to define over
>>> what area you calculate the mean. Otherwise, your mean will encompass an
>>> area much larger than the storm's center.
>>>
>>> For instance, you could calculate the mean in areas where the wind speed
>>> is greater than some value, using the "where" statement.
>>>
>>> Do you do that?
>>>
>>> Barry
>>>
>>> On Wed, Jun 3, 2020 at 9:50 PM Arathy RP <arathyrparathy at gmail.com>
>>> wrote:
>>>
>>>> Hi,
>>>> Yes, I will do that.
>>>> Actually I am plotting mean sea level pressure of very severe cyclonic
>>>> storm Phailin.And I want to get the minimum mean sea level pressure as
>>>> 994.29Pa only. As the cyclone belongs to category 5 storm the pressure
>>>> level should go beyond 960Pa so that intensified contour plot of Phailin i
>>>> will get. And the code is written by me by refering ncl sites.
>>>> I hereby attach the variable details and minimum pressure showing when
>>>> plotted.
>>>> Thanking you
>>>>
>>>> On Wed, Jun 3, 2020 at 8:31 PM Barry Lynn <barry.h.lynn at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi:
>>>>>
>>>>> Can you show us what you are getting and what pressure you print out
>>>>> as the center pressure. This would help identify the problem.
>>>>>
>>>>> Also, where did you get the code to make the surface pressure
>>>>> maps/tracking? Can you define what you mean by minimum contour plot.
>>>>>
>>>>> Barry
>>>>>
>>>>> On Wed, Jun 3, 2020 at 4:27 PM Arathy RP via ncl-talk <
>>>>> ncl-talk at ucar.edu> wrote:
>>>>>
>>>>>> Hi,
>>>>>> I am arz student of MSc finally year . As a part of my project work ,
>>>>>> i am working with cyclone contour plotting.I am dealing with cyclone
>>>>>> phailin and i want to get minimum value contour plot for mean sea level
>>>>>> pressure of cyclone.Actually there is no error showing even though i am
>>>>>> getting a wrong value. I can't find what wrong with this .can you please
>>>>>> help me to clarify it.
>>>>>> I am dealing with an intensified cyclone plot but not getting a
>>>>>> result as expected. Please help me.
>>>>>> I hereby attaching the data and ncl script used.
>>>>>> _______________________________________________
>>>>>> ncl-talk mailing list
>>>>>> ncl-talk at ucar.edu
>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> 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
>>>>>
>>>>> C.E.O, Weather It Is, LTD
>>>>> Weather and Climate Focus
>>>>> http://weather-it-is.com
>>>>> Jerusalem, Israel
>>>>> Local: 02 930 9525
>>>>> Cell: 054 7 231 170
>>>>> Int-IS: x972 2 930 9525
>>>>>
>>>>>
>>>
>>> --
>>> 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
>>>
>>> C.E.O, Weather It Is, LTD
>>> Weather and Climate Focus
>>> http://weather-it-is.com
>>> Jerusalem, Israel
>>> Local: 02 930 9525
>>> Cell: 054 7 231 170
>>> Int-IS: x972 2 930 9525
>>>
>>>
>
> --
> 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
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
>
>
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