[wrfems] Help Needed for Mercator Projection

Tony Freeman tony.freeman at noaa.gov
Thu Feb 23 11:31:10 MST 2012


Thanks, Jordan:

Here's the first bit of info from this command: wgrib2 -grid
arw_d02.grb2f000000

1:0:grid_template=10:
  Mercator grid: (185 x 185) LatD 23.740000 input WE:SN output WE:SN res 56
  lat 22.895000 to 25.859000 by 1800.000000 m
  lon 276.9888000 to 280.242000 by 1800.000000 m
  orientation 0.000000

Here's the output from this command:  gribnav  arw_d02.grb2f000000

File Name : arw_d02.grb2f000000
File Format : GRIB 2
Model ID : 98
Center ID : 7
Sub Center ID : 0
Grid Projection : Mercator
Grid Dimensions NX x NY : 185 x 185
Grid Spacing DX, DY : 1.800km, 1.800km
Standard Latitude : 23.740
Orientation Longitude : 0.000
Latitude, Longitude (1,1): 22.895, -83.012
Pole : NA
Scan : WE:SN
Corner Lat-Lon points of the domain:
25.859, -83.012  25.859, -79.758
        24.377, -81.385
22.895, -83.012  22.895, -79.758


-- Tony


On Thu, Feb 23, 2012 at 12:01 PM, Jordan Gerth <Jordan.Gerth at noaa.gov>wrote:

>  Tony,
>
> It is hard to say what the proper entries should be without the GRIB2
> file, but "23.740 0.000 23.740" is probably not right for the Mercator
> projection.  What does "wgrib2 -grid" provide?
>
> center_lat: central latitude or latitude of tangent point (23.740)
> center_lon: central longitude or longitude of tangent point (0.000)
> rotation: projection rotation (23.740)
>
> Best,
>
> Jordan Gerth
>
>
> On 2/23/2012 11:15 AM, Tony Freeman wrote:
>
> Hi all,
>
>  I'm trying to get the WRF grib2 files to display at the KEY office but
> having problems.  The grib2 file is being ingested and products are being
> stored, but the display on D2D is skewed.  The graphic that comes up is not
> a large square box but rather a thin rectangle that has been rotated by 90
> degrees (see image).
>
>  One thing different about the way the grib2 files are generated is that
> the projection is Mercator (rather than Lambert Conformal).  The only place
> I can find to be sure Mercator is used is in the makeDataSups.patch.  Here
> is my entry:
>
>  maksuparg 9 23.740 0.000 23.740 WSWRFD01.sup l 19.215 -87.487 28.113
> -74.133
>
>  [image: Inline image 1]
>
>
>   -- Tony
>
>  ============================
> *Tony Freeman*
> Information Technology Officer
> National Weather Service, SRHQ
> 819 Taylor Street, Room 10A24
> Fort Worth, TX 76102-6171
> Voice: 817-978-7777 x 306
> ============================
>
>
>
>
> _______________________________________________
> wrfems mailing listwrfems at comet.ucar.edu
>
>


-- 

============================
*Tony Freeman*
Information Technology Officer
National Weather Service, SRHQ
819 Taylor Street, Room 10A24
Fort Worth, TX 76102-6171
Voice: 817-978-7777 x 306
============================
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