| 1 | #!/usr/bin/python |
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| 2 | # -*- coding: utf-8 -*- |
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| 3 | """ |
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| 4 | Created on Mar 7, 2016 |
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| 5 | |
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| 6 | @author: petra |
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| 7 | |
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| 8 | Version 2: return also vertical levels, based on U wind |
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| 9 | |
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| 10 | Usage: `./grib_domain.py <gribfile> [map]` |
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| 11 | |
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| 12 | The map will only be shown if the `map` keyward is present. |
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| 13 | |
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| 14 | """ |
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| 15 | |
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| 16 | import pygrib |
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| 17 | import sys |
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| 18 | |
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| 19 | from mpl_toolkits.basemap import Basemap |
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| 20 | import numpy as np |
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| 21 | import matplotlib.pyplot as plt |
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| 22 | #from matplotlib.backends.backend_pdf import PdfPages |
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| 23 | |
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| 24 | if len(sys.argv)==1: |
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| 25 | fname='/home/petra/P/Flexpart/FpTests/Hasod_ec_hires/ER12101512' |
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| 26 | elif len(sys.argv)==2: |
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| 27 | if sys.argv[1] == '-h' or sys.argv[1] == '--help': |
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| 28 | print '\nUsage: ./grib_domain.py <gribfile> [map]' |
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| 29 | print 'The map will only be shown if the `map` keyword is present.\n' |
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| 30 | quit() |
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| 31 | else: |
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| 32 | fname=sys.argv[1] |
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| 33 | |
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| 34 | Map=False |
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| 35 | if len(sys.argv)==3: |
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| 36 | if sys.argv[2]=='map': Map=True |
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| 37 | |
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| 38 | en=pygrib.open(fname) |
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| 39 | lats, lons = en[1].latlons() |
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| 40 | ymin=lats.min() |
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| 41 | ymax=lats.max() |
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| 42 | xmin=lons.min() |
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| 43 | xmax=lons.max() |
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| 44 | |
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| 45 | ym = 0.5*(ymin+ymax) |
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| 46 | xm = 0.5*(xmin+xmax) |
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| 47 | numx=lats.shape[1]-1 |
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| 48 | numy=lats.shape[0]-1 |
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| 49 | dx=(xmax-xmin)/numx |
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| 50 | dy=(ymax-ymin)/numy |
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| 51 | levels=[] |
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| 52 | for field in en: |
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| 53 | content = field.__repr__() |
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| 54 | print field |
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| 55 | if 'U component of wind' in content: |
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| 56 | levels.append(content.split(':')[5].split(' ')[1]) |
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| 57 | if len(levels) == 0: |
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| 58 | print fname+':','x=',xmin,xmax,dx,numx+1, ' y=',ymin,ymax,dy,numy+1,\ |
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| 59 | 'nuvz=',len(levels) |
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| 60 | else: |
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| 61 | print fname+':','x=',xmin,xmax,dx,numx+1, ' y=',ymin,ymax,dy,numy+1,\ |
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| 62 | 'nuvz=',len(levels),'(',min(levels),max(levels),')' |
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| 63 | |
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| 64 | if Map==True: |
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| 65 | |
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| 66 | # lon_0 is central longitude of projection. |
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| 67 | # resolution = 'c' means use crude resolution coastlines. |
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| 68 | #m = Basemap(projection='robin',lon_0=45.,resolution='c') |
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| 69 | #m = Basemap(projection='ortho',lat_0=ym,lon_0=xm,resolution='l') |
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| 70 | xmin5=max(xmin-5.,-180.) |
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| 71 | xmax5=min(xmax+5.,180.) |
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| 72 | ymin5=max(ymin-5.,-90.) |
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| 73 | ymax5=min(ymax+5.,90.) |
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| 74 | xmin10=max(xmin-10.,-180.) |
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| 75 | xmax10=min(xmax+10.,180.) |
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| 76 | ymin10=max(ymin-10.,-90.) |
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| 77 | ymax10=min(ymax+10.,90.) |
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| 78 | |
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| 79 | m = Basemap(llcrnrlon=xmin5,llcrnrlat=ymin5, |
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| 80 | urcrnrlon=xmax5,urcrnrlat=ymax5, |
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| 81 | projection='mill',lat_0=ym,lon_0=xm, |
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| 82 | resolution ='l',area_thresh=10000.) |
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| 83 | m.drawcoastlines(linewidth=.5) |
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| 84 | m.drawcountries(color='w') |
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| 85 | m.fillcontinents() |
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| 86 | # draw parallels and meridians. |
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| 87 | m.drawparallels(np.arange(ymin10,ymax10,5.),linewidth=1.,labels=[1,0,0,0]) |
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| 88 | m.drawmeridians(np.arange(xmin10,xmax10,5.),linewidth=1.,latmax=90., |
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| 89 | labels=[0,0,0,1]) |
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| 90 | m.plot(lons,lats,'b+',ms=2.,latlon=True) |
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| 91 | plt.title('DX='+str(dx)+' DY='+str(dy),color='b') |
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| 92 | #m.etopo(scale=0.25) |
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| 93 | plt.show() |
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| 94 | print 'done' |
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