[ncl-talk] Wrong values getting on contour plot
Barry Lynn
barry.h.lynn at gmail.com
Thu Jun 4 12:41:12 MDT 2020
Hi:
Making progress.
Is that the location and time when you expect the lowest pressure?
On Thu, 4 Jun 2020 at 20:46 Arathy RP <arathyrparathy at gmail.com> wrote:
> 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
>>
>> --
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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