Re: Lat/Lon Question

Thanks for the suggestion Winston. I was able to obtain what I needed in
that directory.

Greg


On Thu, Jul 10, 2014 at 9:03 AM, Winston Hao <wxhao@gw.dec.state.ny.us>
wrote:

> Hi Greg,
>
> On the left side of HRRR page ( http://ruc.noaa.gov/hrrr/ ), you
> can follow a link called "HRRR static fields inc lat/lon" to download
> geo_em.d01.nc Perhaps the information in that file would be useful to
> you?
>
> Winston
>
> >>> Greg Garrett - NOAA Federal <greg.garrett@noaa.gov> 7/9/2014 4:11 PM
> >>>
> Rick,
>
> What I am really trying to do is extract a subset of data from a conus
> native lambert conformal projected domain. The bounding box of my sub
> domain is in lat/lon. Since lat/lon is not a grid in my grib2 file, I have
> no way that I can figure out how to tell ncl to only pull information out
> for my area of interest.
>
> The grib2 file is the 3km HRRR model for the conus which is extremely
> large. I am using the opendap version of ncl in an effort to only extract
> parameter data for just my immediate area after opening the url of the
> grib2 file.
>
> I have a ncl_filedump of one of the grib files below for reference. Any
> ideas?
>
> Greg
>
> Copyright (C) 1995-2014 - All Rights Reserved
> University Corporation for Atmospheric Research
> NCAR Command Language Version 6.2.0
> The use of this software is governed by a License Agreement.
> See http://www.ncl.ucar.edu/ for more details.
>
> Variable: f
> Type: file
> filename: wrftwo_subh_RUN_2014-07-09T16:00:00Z
> path:
> http://esrl.noaa.gov/gsd/thredds/dodsC/hrrr/conus/wrftwo_subh/runs/wrftwo_subh_RUN_2014-07-09T16:00:00Z
> file global attributes:
> Originating_or_generating_Center : The NOAA Forecast Systems Laboratory,
> Boulder, CO, USA
> Originating_or_generating_Subcenter : 0
> GRIB_table_version : 2,1
> Type_of_generating_process : Forecast
> Analysis_or_forecast_generating_process_identifier_defined_by_originating_centre
> : High-Resolution Rapid Refresh
> Conventions : CF-1.4, _Coordinates
> history : Read using CDM IOSP Grib2Collection ;
> FMRC Run 2014-07-09T16:00:00Z Dataset
> featureType : GRID
> file_format : GRIB-2
> _CoordSysBuilder : ucar.nc2.dataset.conv.CF1Convention
> cdm_data_type : GRID
> location : Proto fmrc:wrftwo_subh
> dimensions:
> ncl_scalar = 1
> height_above_ground = 1
> height_above_ground1 = 1
> height_above_ground2 = 1
> height_above_ground3 = 1
> height_above_ground_layer = 1
> height_above_ground_layer1 = 1
> height_above_ground_layer1_bounds_1 = 2
> height_above_ground_layer_bounds_1 = 2
> time = 61
> x = 1799
> y = 1059
> variables:
> integer LambertConformal_Projection ( ncl_scalar )
> long_name :
> grid_mapping_name : lambert_conformal_conic
> latitude_of_projection_origin : 38.5
> longitude_of_central_meridian : 262.5
> standard_parallel : 38.5
> earth_radius : 6367470
> _CoordinateTransformType : Projection
> _CoordinateAxisTypes : GeoX GeoY
>
> float height_above_ground_layer_bounds ( height_above_ground_layer,
> height_above_ground_layer_bounds_1 )
> units : m
> long_name : bounds for height_above_ground_layer
>
> float height_above_ground_layer1_bounds ( height_above_ground_layer1,
> height_above_ground_layer1_bounds_1 )
> units : m
> long_name : bounds for height_above_ground_layer1
>
> double time_offset ( time )
> long_name : offset hour from start of run for coordinate = time
> standard_name : forecast_period
> units : hours since 2014-07-08T18:00:00Z
> missing_value : nan
> _FillValue : nan
>
> float x ( x )
> units : km
> long_name : projection_x_coordinate
> standard_name : projection_x_coordinate
> _CoordinateAxisType : GeoX
>
> float y ( y )
> units : km
> long_name : projection_y_coordinate
> standard_name : projection_y_coordinate
> _CoordinateAxisType : GeoY
>
> float height_above_ground ( height_above_ground )
> units : m
> long_name : Specified height level above ground
> positive : up
> Grib2_level_type : 103
> datum : ground
> _CoordinateAxisType : Height
> _CoordinateZisPositive : up
>
> float height_above_ground1 ( height_above_ground1 )
> units : m
> long_name : Specified height level above ground
> positive : up
> Grib2_level_type : 103
> datum : ground
> _CoordinateAxisType : Height
> _CoordinateZisPositive : up
>
> float height_above_ground_layer ( height_above_ground_layer )
> units : m
> long_name : Specified height level above ground
> positive : up
> Grib2_level_type : 103
> datum : ground
> bounds : height_above_ground_layer_bounds
> _CoordinateAxisType : Height
> _CoordinateZisPositive : up
>
> float height_above_ground_layer1 ( height_above_ground_layer1 )
> units : m
> long_name : Specified height level above ground
> positive : up
> Grib2_level_type : 103
> datum : ground
> bounds : height_above_ground_layer1_bounds
> _CoordinateAxisType : Height
> _CoordinateZisPositive : up
>
> float height_above_ground2 ( height_above_ground2 )
> units : m
> long_name : Specified height level above ground
> positive : up
> Grib2_level_type : 103
> datum : ground
> _CoordinateAxisType : Height
> _CoordinateZisPositive : up
>
> float height_above_ground3 ( height_above_ground3 )
> units : m
> long_name : Specified height level above ground
> positive : up
> Grib2_level_type : 103
> datum : ground
> _CoordinateAxisType : Height
> _CoordinateZisPositive : up
>
> double time ( time )
> long_name : Forecast time for ForecastModelRunCollection
> standard_name : time
> units : hours since 2014-07-08T18:00:00Z
> missing_value : nan
> _CoordinateAxisType : Time
> _FillValue : nan
>
> float Temperature_height_above_ground ( time, height_above_ground, y, x )
> units : K
> long_name : Temperature @ Specified height level above ground
> missing_value : nan
> description : Mean temperature in lowest 30 mb
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-0-0_L103
> Grib2_Parameter : ( 0, 0, 0 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Temperature
> Grib2_Parameter_Name : Temperature
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground y x
> _FillValue : nan
>
> float Dew-point_temperature_height_above_ground ( time,
> height_above_ground, y, x )
> units : K
> long_name : Dew-point temperature @ Specified height level above ground
> missing_value : nan
> description : Mean dewpoint temperature in lowest 30 mb
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-0-6_L103
> Grib2_Parameter : ( 0, 0, 6 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Temperature
> Grib2_Parameter_Name : Dew-point temperature
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground y x
> _FillValue : nan
>
> float Convective_Initiation1_Entire_atmosphere ( time, y, x )
> units : minutes
> long_name : Convective Initiation1 @ null
> missing_value : nan
> description : Time since last convective initation (> 1 hr) based upon
> lightning threat 3 and no adjacent activity
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-0-195_L200
> Grib2_Parameter : ( 0, 0, 195 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Temperature
> Grib2_Parameter_Name : Convective Initiation1
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Convective_Acitivity1_Entire_atmosphere ( time, y, x )
> units : minutes
> long_name : Convective Acitivity1 @ null
> missing_value : nan
> description : Time since last convective activity based upon lightning
> threat 3
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-0-196_L200
> Grib2_Parameter : ( 0, 0, 196 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Temperature
> Grib2_Parameter_Name : Convective Acitivity1
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Convective_Activitiy2_Entire_atmosphere ( time, y, x )
> units : minutes
> long_name : Convective Activitiy2 @ null
> missing_value : nan
> description : Time since last convective activity based upon vertical
> flux of rain and graupel
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-0-201_L200
> Grib2_Parameter : ( 0, 0, 201 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Temperature
> Grib2_Parameter_Name : Convective Activitiy2
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Convective_Activity3_Entire_atmosphere ( time, y, x )
> units : minutes
> long_name : Convective Activity3 @ null
> missing_value : nan
> description : Time since last convective activitiy based upon 35 dBZ
> reflectivity at -10C
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-0-202_L200
> Grib2_Parameter : ( 0, 0, 202 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Temperature
> Grib2_Parameter_Name : Convective Activity3
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Specific_humidity_height_above_ground ( time, height_above_ground,
> y, x )
> units : kg/kg
> long_name : Specific humidity @ Specified height level above ground
> missing_value : nan
> description : Specific humidity at 2 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-0_L103
> Grib2_Parameter : ( 0, 1, 0 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Specific humidity
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground y x
> _FillValue : nan
>
> float Precipitation_rate_surface ( time, y, x )
> units : kg.m-2.s-1
> long_name : Precipitation rate @ Ground or water surface
> missing_value : nan
> description : Precipitation rate
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-7_L1
> Grib2_Parameter : ( 0, 1, 7 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Precipitation rate
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Precipitation_Type4_surface ( time, y, x )
> units : flag
> long_name : Precipitation Type4 @ Ground or water surface
> missing_value : nan
> description : Categorical rain (yes=1 no=0)
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-192_L1
> Grib2_Parameter : ( 0, 1, 192 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Precipitation Type4
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Precipitation_Type3_surface ( time, y, x )
> units : flag
> long_name : Precipitation Type3 @ Ground or water surface
> missing_value : nan
> description : Categorical freezing rain (yes=1 no=0)
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-193_L1
> Grib2_Parameter : ( 0, 1, 193 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Precipitation Type3
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Precipitation_Type2_surface ( time, y, x )
> units : flag
> long_name : Precipitation Type2 @ Ground or water surface
> missing_value : nan
> description : Categorical ice pellets (yes=1 no=0)
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-194_L1
> Grib2_Parameter : ( 0, 1, 194 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Precipitation Type2
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Precipitation_Type1_surface ( time, y, x )
> units : flag
> long_name : Precipitation Type1 @ Ground or water surface
> missing_value : nan
> description : Categorical snow (yes=1 no=0)
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-195_L1
> Grib2_Parameter : ( 0, 1, 195 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Precipitation Type1
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Convective_Initiation2_Entire_atmosphere ( time, y, x )
> units : minutes
> long_name : Convective Initiation2 @ null
> missing_value : nan
> description : Time since last convective initation (> 1 hr) based upon
> flux of rain/graupel and no adjacent activity
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-213_L200
> Grib2_Parameter : ( 0, 1, 213 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Convective Initiation2
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Convective_Initiation3_Entire_atmosphere ( time, y, x )
> units : minutes
> long_name : Convective Initiation3 @ null
> missing_value : nan
> description : Time since last convective initation (> 1 hr) based upon 35
> dBZ reflectivity at -10C and no adjacent activity
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-1-214_L200
> Grib2_Parameter : ( 0, 1, 214 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Moisture
> Grib2_Parameter_Name : Convective Initiation3
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float u-component_of_wind_height_above_ground ( time,
> height_above_ground3, y, x )
> units : m/s
> long_name : u-component of wind @ Specified height level above ground
> missing_value : nan
> description : U-component of wind at 10 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-2-2_L103
> Grib2_Parameter : ( 0, 2, 2 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Momentum
> Grib2_Parameter_Name : u-component of wind
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground3 y x
> _FillValue : nan
>
> float v-component_of_wind_height_above_ground ( time,
> height_above_ground3, y, x )
> units : m/s
> long_name : v-component of wind @ Specified height level above ground
> missing_value : nan
> description : V-component of wind at 10 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-2-3_L103
> Grib2_Parameter : ( 0, 2, 3 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Momentum
> Grib2_Parameter_Name : v-component of wind
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground3 y x
> _FillValue : nan
>
> float Wind_mixing_energy_height_above_ground ( time, height_above_ground2,
> y, x )
> units : J
> long_name : Wind mixing energy @ Specified height level above ground
> missing_value : nan
> description : Wind energy generation potential using 0.5*density*speed^3
> at 80 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-2-19_L103
> Grib2_Parameter : ( 0, 2, 19 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Momentum
> Grib2_Parameter_Name : Wind mixing energy
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground2 y x
> _FillValue : nan
>
> float Wind_speed_gust_surface ( time, y, x )
> units : m/s
> long_name : Wind speed (gust) @ Ground or water surface
> missing_value : nan
> description : Wind gust speed at 10 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-2-22_L1
> Grib2_Parameter : ( 0, 2, 22 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Momentum
> Grib2_Parameter_Name : Wind speed (gust)
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Pressure_surface ( time, y, x )
> units : Pa
> long_name : Pressure @ Ground or water surface
> missing_value : nan
> description : Surface pressure
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-3-0_L1
> Grib2_Parameter : ( 0, 3, 0 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Mass
> Grib2_Parameter_Name : Pressure
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Geopotential_height_cloud_base ( time, y, x )
> units : gpm
> long_name : Geopotential height @ Cloud base level
> missing_value : nan
> description : Adiabatic condensation level above ground (LCL)
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-3-5_L2
> Grib2_Parameter : ( 0, 3, 5 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Mass
> Grib2_Parameter_Name : Geopotential height
> Grib2_Level_Type : 2
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Geopotential_height_cloud_tops ( time, y, x )
> units : gpm
> long_name : Geopotential height @ Level of cloud tops
> missing_value : nan
> description : Adiabatic condensation level above ground (LCL)
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-3-5_L3
> Grib2_Parameter : ( 0, 3, 5 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Mass
> Grib2_Parameter_Name : Geopotential height
> Grib2_Level_Type : 3
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Echo_Top_cloud_tops ( time, y, x )
> units : m
> long_name : Echo Top @ Level of cloud tops
> missing_value : nan
> description : Echo top height of 18dBZ surface
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-3-193_L3
> Grib2_Parameter : ( 0, 3, 193 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Mass
> Grib2_Parameter_Name : Echo Top
> Grib2_Level_Type : 3
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float VIL_Entire_atmosphere ( time, y, x )
> units : kg/m2
> long_name : VIL @ null
> missing_value : nan
> description : Vertically integrated liquid
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-3-194_L200
> Grib2_Parameter : ( 0, 3, 194 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Mass
> Grib2_Parameter_Name : VIL
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Radar_VIL_Entire_atmosphere ( time, y, x )
> units : kg/m2
> long_name : Radar VIL @ null
> missing_value : nan
> description : Radar-derived vertically integrated liquid
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-3-195_L200
> Grib2_Parameter : ( 0, 3, 195 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Mass
> Grib2_Parameter_Name : Radar VIL
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Radiation_surface ( time, y, x )
> units : W/m2
> long_name : Radiation @ Ground or water surface
> missing_value : nan
> description : Incoming shortwave radiation at the surface
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-4-192_L1
> Grib2_Parameter : ( 0, 4, 192 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Short-wave radiation
> Grib2_Parameter_Name : Radiation
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Radiation_atmosphere_top ( time, y, x )
> units : W/m2
> long_name : Radiation @ Nominal top of the atmosphere
> missing_value : nan
> description : Outgoing longwave radiation at top of atmosphere
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-5-193_L8
> Grib2_Parameter : ( 0, 5, 193 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Long-wave radiation
> Grib2_Parameter_Name : Radiation
> Grib2_Level_Type : 8
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Updraft_Helicity_height_above_ground_layer ( time,
> height_above_ground_layer, y, x )
> units : m2/s2
> long_name : Updraft Helicity @ Specified height level above ground layer
> missing_value : nan
> description : Updraft helicity in layer 2-5 km above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-7-197_L103_layer
> Grib2_Parameter : ( 0, 7, 197 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Thermodynamic stability indices
> Grib2_Parameter_Name : Updraft Helicity
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground_layer y x
> _FillValue : nan
>
> float Reflectivity_height_above_ground ( time, height_above_ground1, y, x )
> units : dBZ
> long_name : Reflectivity @ Specified height level above ground
> missing_value : nan
> description : Reflectivity at 1 km above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-16-195_L103
> Grib2_Parameter : ( 0, 16, 195 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Forecast radar imagery
> Grib2_Parameter_Name : Reflectivity
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground1 y x
> _FillValue : nan
>
> float Composite_Reflectivity_Entire_atmosphere ( time, y, x )
> units : dBZ
> long_name : Composite Reflectivity @ null
> missing_value : nan
> description : Maximum reflectivity in model column
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-16-196_L200
> Grib2_Parameter : ( 0, 16, 196 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Forecast radar imagery
> Grib2_Parameter_Name : Composite Reflectivity
> Grib2_Level_Type : 200
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float Visibility_surface ( time, y, x )
> units : m
> long_name : Visibility @ Ground or water surface
> missing_value : nan
> description : Surface visibility
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_0-19-0_L1
> Grib2_Parameter : ( 0, 19, 0 )
> Grib2_Parameter_Discipline : Meteorological products
> Grib2_Parameter_Category : Physical atmospheric properties
> Grib2_Parameter_Name : Visibility
> Grib2_Level_Type : 1
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time y x
> _FillValue : nan
>
> float SBT123_height_above_ground_layer ( time, height_above_ground_layer1,
> y, x )
> units : m2/s2
> long_name : SBT123 @ Specified height level above ground layer
> missing_value : nan
> description : Updraft helicity in layer 1-6 km above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_3-192-1_L103_layer
> Grib2_Parameter : ( 3, 192, 1 )
> Grib2_Parameter_Discipline : Space products
> Grib2_Parameter_Name : SBT123
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground_layer1 y x
> _FillValue : nan
>
> float u-component_of_current_height_above_ground ( time,
> height_above_ground2, y, x )
> units : m/s
> long_name : u-component of current @ Specified height level above ground
> missing_value : nan
> description : U-component of wind at 80 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_10-1-2_L103
> Grib2_Parameter : ( 10, 1, 2 )
> Grib2_Parameter_Discipline : Oceanographic products
> Grib2_Parameter_Category : Currents
> Grib2_Parameter_Name : u-component of current
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground2 y x
> _FillValue : nan
>
> float v-component_of_current_height_above_ground ( time,
> height_above_ground2, y, x )
> units : m/s
> long_name : v-component of current @ Specified height level above ground
> missing_value : nan
> description : V-component of wind at 80 m above ground level
> grid_mapping : LambertConformal_Projection
> Grib_Variable_Id : VAR_10-1-3_L103
> Grib2_Parameter : ( 10, 1, 3 )
> Grib2_Parameter_Discipline : Oceanographic products
> Grib2_Parameter_Category : Currents
> Grib2_Parameter_Name : v-component of current
> Grib2_Level_Type : 103
> Grib2_Generating_Process_Type : Forecast
> coordinates : time_run time height_above_ground2 y x
> _FillValue : nan
>
>
>
>
>
> On Wed, Jul 9, 2014 at 12:03 PM, Rick Brownrigg <brownrig@ucar.edu> wrote:
>
>> Hi Greg,
>>
>> I'm not aware of a means to do this from within NCL. If I had to do it,
>> I'd use the Proj4 cartographic projection library, which would entail:
>>
>> - writing the X/Ys to a temp file,
>> - issue a system() call with a proper command-line containing the L.C.
>> projection details to the "proj" command, which would then read the temp
>> file and write a new file containing lat/lons
>> - read the lat/lon
>>
>> Its a bit clunky, but not too hard *if* you already have Proj4 and are
>> familiar with it (http://trac.osgeo.org/proj/)
>>
>> Hope that helps...
>> Rick
>>
>>
>>
>> On Wed, Jul 9, 2014 at 9:51 AM, Greg Garrett - NOAA Federal <
>> greg.garrett@noaa.gov> wrote:
>>
>>> I am working with a Lambert Conformal projected dataset with GeoX and
>>> GeoY x and y coordinates (excerpt below). There are no latitude or
>>> longitude coordinates.
>>> Can anyone tell me if it is possible to compute lat/lon from the x,y,
>>> and projection information and if so, how?
>>>
>>> Thanks,
>>>
>>> Greg
>>>
>>>
>>> x = 1799
>>> y = 1059
>>> variables:
>>> integer LambertConformal_Projection ( ncl_scalar )
>>> long_name :
>>> grid_mapping_name : lambert_conformal_conic
>>> latitude_of_projection_origin : 38.5
>>> longitude_of_central_meridian : 262.5
>>> standard_parallel : 38.5
>>> earth_radius : 6367470
>>> _CoordinateTransformType : Projection
>>> _CoordinateAxisTypes : GeoX GeoY
>>> float x ( x )
>>> units : km
>>> long_name : projection_x_coordinate
>>> standard_name : projection_x_coordinate
>>> _CoordinateAxisType : GeoX
>>>
>>> float y ( y )
>>> units : km
>>> long_name : projection_y_coordinate
>>> standard_name : projection_y_coordinate
>>> _CoordinateAxisType : GeoY
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>
>>>
>>
>

Received on Thu Jul 10 04:21:39 2014