PseudoNetCDF.noaafiles package

Submodules

PseudoNetCDF.noaafiles.arltime module

PseudoNetCDF.noaafiles.arltime.arl2time(YY, MM, DD, HH, mm)

Convert ARL time pieces to a datetime object

Parameters:

• YY (integer year (2 or 4 digits))

• MM (integer month (1-12))

• DD (integer day (1-31))

• HH (integer hour (0-23))

• mm (integer minute (0-59))

Returns:

d

Return type:

datetime object from datetime.strptime

Module contents

class PseudoNetCDF.noaafiles.arlconcdump(*args, **kwds)

Bases: PseudoNetCDFFile

classmethod isMine(*args, **kwds)

True if this file or object can be identified for use by this class. Useful to override for classes that can be initialized from disk.

class PseudoNetCDF.noaafiles.arlpackedbit(*args, **kwds)

Bases: PseudoNetCDFFile

arlpackedbit reads files formatted according to NOAA’s arl packed bit format

Format as follows:

for t in times:

thdtype = dtype([(‘YYMMDDHHFF’, ‘>10S’), (‘LEVEL’, ‘>2S’),

(‘GRID’, ‘>2S’) , (‘INDX’, ‘>4S’), (‘Z1’, ‘>4S’), (‘MB’, ‘2>14S’), (‘SRCE’, ‘>S4’), (‘MGRID’, ‘>S3’), (‘VSYS’, ‘>S2’), (‘POLLAT’, ‘>S7’), (‘POLLON’, ‘>S7’), (‘REFLAT’,’>S7’), (‘REFLON’,’>S7’), (‘GRIDX’,’>S7’), (‘ORIENT’,’>S7’), (‘TANLAT’,’>S7’), (‘SYNCHX’,’>S7’), (‘SYNCHY’,’>S7’), (‘SYNCHLAT’,’>S7’), (‘SYNCHLON’,’>S7’), (‘RESERVED’, ‘>S7’), (‘NX’, ‘>S3’), (‘NY’, ‘>S3’), (‘NZ’, ‘>S3’), (‘VSYS2’, ‘>S2’), (‘LENH’, ‘>S4’)]) + ny * nx - 158 - 50

ny+nx- for surfacekey in surfacekeys:

YYMMDDHHFFLLGGVVVVEEEEPPPPPPPPPPPPPPVVVVVVVVVVVVVV+ P(ny,nx)

for layerkey in layerkeys:

for layer in layers:

YYMMDDHHFFLLGGVVVVEEEEPPPPPPPPPPPPPPVVVVVVVVVVVVVV+ P(ny,nx)

YY = %y in strftime for GMT date MM = %m in strftime DD = %d in strftime HH = %H of model hour FF = %H of forecast hour LL = 2-digit layer GG = 2-digit grid IIII = ‘INDX’ ZZZZ = 4-digit integer 0 XXXXXXXXXXXXX = %14.7e 0 YYYYYYYYYYYYY = %14.7e 0 EEEE = 4-digit integer exponent PPPPPPPPPPPPP = %14.7e precision VVVVVVVVVVVVV = %14.7e value R(1,1) P(ny,nx) = ny by nx 1-byte values dervied from real values (R) according

to the formula below.

P(i,j) = (Ri,j - Ri-1,j)* (2**(7-(ln dRmax / ln 2)))

Parameters:

• path (string) – path to arl packed bit formatted file

• shape (tuple or None) – shape of file to over ride derived shape

• earth_radius (scalar) – radius of the earth used in converting projected to lat/lon

• synchlon (scalar) – The SYNCHLON variable has 6 digits of precision in the file this keyword allows you to provide more.

• synchlat (scalar) – The SYNCHLAT variable has 6 digits of precision in the file this keyword allows you to provide more.

Returns:

arlf – PseudoNetCDF file with packed bit contents unpacked

Return type:

arlpackedbit

getMap(maptype='basemap_auto', **kwds)

Description

Parameters:

• maptype (string) –

  choices ‘basemap’, ‘basemap_auto’, ‘cartopy’ (not yet) basemap : attempts to open a basemap with only supplied kwds basemap_auto : automatically adds llcrnrlon,llcrnrlat,u

  rcrnrlon,urcrnrlat based on longitude_bounds

• **kwds (keywords) – for basemap or cartopy

Returns:

map

Return type:

basemap or cartopy axis

getproj(withgrid=False, projformat='pyproj')

Description

Parameters:

• withgrid (boolean) – use grid units instead of meters

• projformat (string) – ‘pyproj’ (default), ‘proj4’ or ‘wkt’ allows function to return a pyproj projection object or a string in the format of proj4 or WKT

Returns:

proj – (wkt, proj4) or pyprojProj (pyproj)

Return type:

string pyproj.Proj

classmethod isMine(path)

True if this file or object can be identified for use by this class. Useful to override for classes that can be initialized from disk.

plot(*args, **kwds)

See PseudoNetCDF.PseudoNetCDFFile.plot. For this file, the default plottype is ‘x-y’

class PseudoNetCDF.noaafiles.arlpardump(*args, **kwds)

Bases: PseudoNetCDFFile

classmethod isMine(path)

True if this file or object can be identified for use by this class. Useful to override for classes that can be initialized from disk.

class PseudoNetCDF.noaafiles.arltrajdump(*args, **kwds)

Bases: PseudoNetCDFFile

getTimes()

Get an array of datetime objects

Parameters:

• datetype (string or numpy.dtype) – ‘datetime’ or datetime64 dtype

• bounds (boolean) – get time boundaries

Returns:

out – datetime objects or array of numpy’s datetype type

Return type:

array

Notes

self must have a time or TFLAG variable

classmethod isMine(path)

True if this file or object can be identified for use by this class. Useful to override for classes that can be initialized from disk.

class PseudoNetCDF.noaafiles.l100(*args, **kwds)

Bases: PseudoNetCDFFile

Arguments: path - str path to NOAA sonde l100 file

Returns: l100 - PseudoNetCDF file with longitude, latitude, time, site and

data variables from the file.

avgSigma(vglvls=None, vgtop=None, hyai=None, hybi=None, inplace=False, copyall=True, levelname='LAY')

vglvls - sigma coordinate vgtop - top in Pa

hyai - hybrid eta-component hPa hybi - hybrid sigma-component

classmethod isMine(path)

Must have correct names on line 28