PyNGL & PyNIO Geoscience Visualization & Data IO Modules
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1 PyNGL & PyNIO Geoscience Visualization & Data IO Modules SciPy 08 Dave Brown National Center for Atmospheric Research Boulder, CO
2 Topics What are PyNGL and PyNIO? Quick summary of PyNGL graphics PyNIO interface to NumPy Data model New features Current status new open source beta Future directions
3 Brief History NCAR Graphics HLUs NCL NIO PyNGL PyNIO PyNIO and PyNGL July 2006 (Numeric 24.x/NumPy 1.0) PyNIO 2005 PyNGL 2004 NIO present: 30+ NCL Workshops GSUN - Late 90s 1995: NCL Conference NCL Mid 90s 1992: NCARG Conference Original Fortran Late 60s C interface Mid 90s PyHLU 2003 HLUs Mid 90s GKS/CGM/Fortran 77/UNIX conversion NCAR 1980s
4 PyNGL Python NCL Graphics Library NCL (NCAR Command Language) is a visualization and data processing scripting language PyNGL is Python interface to the same core graphics as NCL. Contours, XY plots, vectors, streamlines, geographical maps, many map projections, overlays, primitives,etc. Regular and irregular rectangular grids; triangular meshes for scalar fields. New very accurate high res global map boundary data set (includes provincial/state boundaries for China, India, Brazil, Australia, Canada, Mexico, US + US counties)
5 Currents at 600 m depth POP displaced pole grid
6 Texas Mesonet real time WRF forecast animation cgi/ogc/wrf_ncl
7
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9 PyNIO A multi format IO module Modelled after Konrad Hinson s Scientific.IO.NetCDF A unified NetCDF like view of all formats Reads: NetCDF, NetCDF 4 Classic, GRIB 1 & 2, HDF 4 (SDS), HDFEOS 2 (Grid and Swath) Writes: NetCDF, HDF 4 Now a stand alone package separate from PyNGL
10 Open and inspect a NetCDF file import Nio f = Nio.open_file("nio-ex5.nc") print f Signature: open_file(filepath, mode='r', options=none, history='', format='') Regular selection: tmp = f.variables[ var ] a = tmp[3,:: 1,40:80:2,:20]
11 Nio file: nio-ex5.nc global attributes: dimensions: lon = 120 lat = 61 lev = 9 time = 6 variables: float lon [ lon ] long_name : longitude units : degrees_east axis : X float lat [ lat ] long_name : latitude units : degrees_north axis : Y float lev [ lev ] long_name : Isobaric surface units : Pa axis : Z integer time [ time ] long_name : Forecast offset from initial time units : hours since 11/15/ :00 axis : T float tmp [ time, lev, lat, lon ] long_name : Temperature units : K _FillValue : -999 float hgt [ time, lev, lat, lon ] long_name : Geopotential height units : gpm _FillValue : -999
12 MaskedArray support MaskedArrayMode options MaskedIfFillAtt (default) MaskedAlways MaskedNever MaskedIfFillAttAndValue MaskedExplicit ExplicitFillValues, MaskBelowValue, MaskAboveValue
13 Extended Selection Thanks to Juerg Schmidli Coordinate and index space selection using named dimensions Reorder dimensions (transpose) using dimension names Scalar, vector, and slice selection Basic bi linear interpolation built in to the selection mechanism Syntax is a whitespace separated string inside square brackets
14 Extended selection examples Given: tmp = f.variables['tmp'] print f.variables[ lev ] [ ] tmp['time i0 lev 1000, lat 60 lon 100:120'] # Positional syntax: tmp['i0 1000, :120'] # Reordering dimensions: tmp['time i0 lat 60 lon 100,120 lev :'] # Inserting variables in the selection string tmp['time i0 lat 60 lon %f,%f lev :' % (minlon,maxlon)] # Interpolating to 10 equally spaced levels: tmp['time i0 lat 60 lon 100,120 lev 0:100k:10ki'] # Reversing the levels: tmp['time i0 lat 60 lon 100,120 lev 100k:0:-10ki'] # Selection using an auxiliary multidimensional coordinate variable: tmp['time 0,3 lev hgt 1500,3000 lat 50,60 lon 237:252']
15 Current status PyNGL & PyNIO betas 1.3.0b1 released 8/18 OSI compliant open source license Binaries available for: Various flavors of Linux, Mac OSX, Other Unix systems, 32 and 64 bit Source distribution available Extensive documentation PyNGL and PyNIO now separate downloads
16 Future plans More IO formats and functionality: NetCDF 4, HDF/HDFEOS 5 Support for groups, structures, etc. Datasets aggregated from multiple files (NcML) A new display model for PyNGL based on Cairo. Vector plotting for triangular mesh data.
17 5010 Registrations 112 Countries 936 Registrations 71 Countries
18 Documentation PyNGL Tutorial, examples with line by line descriptions, function reference PyNIO Reference
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