[Met_help] [rt.rap.ucar.edu #85348] History for ref: Identifying ocean basin to corresponding lat/long
Minna Win via RT
met_help at ucar.edu
Thu Jun 7 12:31:32 MDT 2018
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Initial Request
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*In "TCPairsETCConfig" allows one to define an ocean basin. Basins which
EMC*
*current uses are as follows:*
*BB = Ocean Basin*
*AL *- North Atlantic basin...north of the Equator
*SL *- South Atlantic basin...south of the Equator
*EP *- North East Pacific basin...eastward of 140ºW
*CP *- North Central Pacific basin between the Dateline and 140ºW
*WP *- North West Pacific basin...westward of the Dateline
*IO *- North Indian Ocean basin...north of the Equator between 40ºE and
100ºE
*SH *- South Pacific Ocean Basin and South Indian Ocean basin
In "cyclone_plotter.conf" the following parameters are used to define the
above
basins:
CYCLONE_LLCRNRLON =
CYCLONE_LLCRNRLAT =
CYCLONE_URCRNRLON =
CYCLONE_URCRNRLAT =
CYCLONE_RESOLUTION = c
CIRCLE_MARKER_SIZE = 41
CROSS_MARKER_SIZE = 51
Questions:
1. Has the above basins already been defined by MET=?
If so, could you provide me with the lat/long? Or, are the parameters
set to
a default lat/long? Or, does the user enters the lat/long he(she)
wants?
2. What does the following terms mean :
*CIRCLE_MARKER_SIZE*
Used in XXX to control XXX default is 41 ?????
*CROSS_MARKER_SIZE*
Used in XXX to control XXX default is 51 ??????
Thanks,
Steve
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Complete Ticket History
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Subject: ref: Identifying ocean basin to corresponding lat/long
From: Minna Win
Time: Wed May 30 14:46:14 2018
Hi Steve,
I will need to investigate further, or ask another MET engineer to get
the
definitive answers to your questions. Thank you for your patience
while I
seek the information you request.
Regards,
Minna
---------------
Minna Win
NCAR
Research Applications Lab
Phone: 303-497-8423
Fax: 302-497-8401
On Wed, May 30, 2018 at 6:10 PM, Steven Lilly - NOAA Federal via RT <
met_help at ucar.edu> wrote:
>
> Wed May 30 12:10:59 2018: Request 85348 was acted upon.
> Transaction: Ticket created by steven.lilly at noaa.gov
> Queue: met_help
> Subject: ref: Identifying ocean basin to corresponding lat/long
> Owner: Nobody
> Requestors: steven.lilly at noaa.gov
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=85348 >
>
>
> *In "TCPairsETCConfig" allows one to define an ocean basin. Basins
which
> EMC*
>
>
> *current uses are as follows:*
>
> *BB = Ocean Basin*
>
> *AL *- North Atlantic basin...north of the Equator
>
> *SL *- South Atlantic basin...south of the Equator
>
> *EP *- North East Pacific basin...eastward of 140ºW
>
> *CP *- North Central Pacific basin between the Dateline and 140ºW
>
> *WP *- North West Pacific basin...westward of the Dateline
>
> *IO *- North Indian Ocean basin...north of the Equator between 40ºE
and
> 100ºE
>
> *SH *- South Pacific Ocean Basin and South Indian Ocean basin
>
>
> In "cyclone_plotter.conf" the following parameters are used to
define the
> above
>
> basins:
>
> CYCLONE_LLCRNRLON =
> CYCLONE_LLCRNRLAT =
> CYCLONE_URCRNRLON =
> CYCLONE_URCRNRLAT =
> CYCLONE_RESOLUTION = c
> CIRCLE_MARKER_SIZE = 41
> CROSS_MARKER_SIZE = 51
>
>
> Questions:
>
> 1. Has the above basins already been defined by MET=?
>
> If so, could you provide me with the lat/long? Or, are the
parameters
> set to
>
> a default lat/long? Or, does the user enters the lat/long
he(she)
> wants?
>
> 2. What does the following terms mean :
>
>
> *CIRCLE_MARKER_SIZE*
> Used in XXX to control XXX default is 41 ?????
>
>
> *CROSS_MARKER_SIZE*
> Used in XXX to control XXX default is 51 ??????
>
> Thanks,
>
> Steve
>
>
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Subject: ref: Identifying ocean basin to corresponding lat/long
From: Minna Win
Time: Thu May 31 10:32:12 2018
Hi Steve,
1) In response to your first question, about how the basins' lons and
lats are defined:
I dug around the MET user's manual, and in section 18.2 for met-6.1
(TC-Dland tool), there are three files in the share/met/tc_data/
directory that contain the lons and lats used by NHC for the basins:
a) The aland.dat file contains the lon and lats for the Atlantic and
easter North Pacific basins
b) The shland.dat contains those for the Southern Hemisphere (south
Pacific, South Indian Ocean)
c) The wland.dat contains the remainder of the Northern Hemisphere (
western North Pacific, North Indian Ocean)
The output file from TC-dland is a NetCDF format file containing the
gridded field representing the distance to the nearest coastline or
island. It is this file that is used in the TC-Pairs tool to compute
the distance from land for each track point in the adeck and bdeck.
In the share/met/tc_data directory, the dland_nw_hem_tenth_degree.nc
file contains TC-dland output from aland.dat using a 1/10 deg grid.
The dland_global_tenth_degree.nc file contain TC-dland output from all
three land data files (global coverage) using a 1/10 deg grid.
The dland file is specified in the TCPairsETCConfig file used in the
MET+ track_and_intensity use case.
2) In response to your second questions, about the CIRCLE_MARKER_SIZE
and CROSS_MARKER_SIZE keys in the MET+ config file
cyclone_plotter.conf:
These correspond to the size of the cross marker (+) and circle
marker(o) I used to recreate the plots on
http://www.emc.ncep.noaa.gov/mmb/gplou/emchurr/glblgen/. The default
values of 51 and 41 are what I found to produce the marker sizes you
see on the plot. Marker sizes in Matplotlib are areas of the marker
size (in points), so marker sizes increase rapidly with small
increases. You can modify these values to minimize or maximize the
size of these markers to suit your preferences.
I hope this answered your questions. Please do not hesitate to contact
us with any other MET related questions.
Regards,
Minna
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Subject: ref: Identifying ocean basin to corresponding lat/long
From: Minna Win
Time: Thu May 31 11:08:02 2018
Hi Steve,
I forgot to clarify that the CYCLONE_LLCRNRLON, CYCLONE_LLCRNRLAT,
CYCLONE_URCRNRLON, and CYCLONE_URCRNRLAT in cyclone_plotter.conf file
all relate to the map projection for the plot, as stated in the
comments above these settings. These specific values correspond to the
cylindrical map projections used by NOAA/EMC to re-create the map of
the world you see on the plots on the "NCEP Tropical and Extratropical
Cylone Tracks and Verification" web page at
http://www.emc.ncep.noaa.gov/mmb/gplou/emchurr/glblgen/.
Mallory Row provided me with these coordinates. You should not need to
change these values unless you wish to change your map projection.
Regards,
Minna
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