import sys, datetime
# read in sea-surface temperature and ice data
# can be a local file, a URL for a remote opendap dataset,
if len(sys.argv) == 1:
date = '20071215'
else:
date = sys.argv[1]
# convert datestring to datetime object.
date = datetime.datetime(int(date[0:4]), int(date[4:6]), int(date[6:8]))
print date
# open dataset.
dataset =\
NetCDFFile('http://nomads.ncdc.noaa.gov/thredds/dodsC/oisst2/totalAmsrAgg')
# find index of desired time.
time = dataset.variables['time']
nt = date2index(date, time, calendar='standard')
print num2date(time[nt], time.units, calendar='standard')
# read sst. Will automatically create a masked array using
# missing_value variable attribute.
sst = dataset.variables['sst'][nt]
# read ice.
ice = dataset.variables['ice'][nt]
# read lats and lons (representing centers of grid boxes).
lats = dataset.variables['lat'][:]
lons = dataset.variables['lon'][:]
# shift lats, lons so values represent edges of grid boxes
# (as pcolor expects).
delon = lons[1] - lons[0]
delat = lats[1] - lats[0]
lons = (lons - 0.5 * delon).tolist()
lons.append(lons[-1] + delon)
# set OpenDAP server URL.
URL="http://nomad1.ncep.noaa.gov:9090/dods/reanalyses/reanalysis-2/6hr/pgb/pgb"
print URL
try:
data = NetCDFFile(URL)
except:
raise IOError, 'opendap server not providing the requested data'
# read lats,lons,times.
print data.variables.keys()
latitudes = data.variables['lat'][:]
longitudes = data.variables['lon'][:].tolist()
times = data.variables['time']
ntime1 = date2index(date1,times,calendar='standard')
ntime2 = date2index(date2,times,calendar='standard')
print 'ntime1,ntime2:',ntime1,ntime2
print num2date(times[ntime1],times.units,calendar='standard'), num2date(times[ntime2],times.units,calendar='standard')
# get sea level pressure and 10-m wind data.
slpdata = data.variables['presmsl']
udata = data.variables['ugrdprs']
vdata = data.variables['vgrdprs']
# mult slp by 0.01 to put in units of millibars.
slpin = 0.01*slpdata[ntime1:ntime2+1,:,:]
uin = udata[ntime1:ntime2+1,0,:,:]
vin = vdata[ntime1:ntime2+1,0,:,:]
dates = num2date(times[ntime1:ntime2+1], times.units, calendar='standard')
# add cyclic points
slp = np.zeros((slpin.shape[0],slpin.shape[1],slpin.shape[2]+1),np.float64)
slp[:,:,0:-1] = slpin; slp[:,:,-1] = slpin[:,:,0]
import sys, datetime
# read in sea-surface temperature and ice data
# can be a local file, a URL for a remote opendap dataset,
if len(sys.argv) == 1:
date = '20071215'
else:
date = sys.argv[1]
# convert datestring to datetime object.
date = datetime.datetime(int(date[0:4]),int(date[4:6]),int(date[6:8]))
print date
# open dataset.
dataset =\
NetCDFFile('http://nomads.ncdc.noaa.gov/thredds/dodsC/oisst2/totalAmsrAgg')
# find index of desired time.
time = dataset.variables['time']
nt = date2index(date, time, calendar='standard')
print num2date(time[nt],time.units, calendar='standard')
# read sst. Will automatically create a masked array using
# missing_value variable attribute.
sst = dataset.variables['sst'][nt]
# read ice.
ice = dataset.variables['ice'][nt]
# read lats and lons (representing centers of grid boxes).
lats = dataset.variables['lat'][:]
lons = dataset.variables['lon'][:]
# shift lats, lons so values represent edges of grid boxes
# (as pcolor expects).
delon = lons[1]-lons[0]
delat = lats[1]-lats[0]
lons = (lons - 0.5*delon).tolist()
lons.append(lons[-1]+delon)
print date1, date2
# set OpenDAP server URL.
URL = "http://nomad1.ncep.noaa.gov:9090/dods/reanalyses/reanalysis-2/6hr/pgb/pgb"
print URL
try:
data = NetCDFFile(URL)
except:
raise IOError, 'opendap server not providing the requested data'
# read lats,lons,times.
print data.variables.keys()
latitudes = data.variables['lat'][:]
longitudes = data.variables['lon'][:].tolist()
times = data.variables['time']
ntime1 = date2index(date1, times, calendar='standard')
ntime2 = date2index(date2, times, calendar='standard')
print 'ntime1,ntime2:', ntime1, ntime2
print num2date(times[ntime1], times.units,
calendar='standard'), num2date(times[ntime2],
times.units,
calendar='standard')
# get sea level pressure and 10-m wind data.
slpdata = data.variables['presmsl']
udata = data.variables['ugrdprs']
vdata = data.variables['vgrdprs']
# mult slp by 0.01 to put in units of millibars.
slpin = 0.01 * slpdata[ntime1:ntime2 + 1, :, :]
uin = udata[ntime1:ntime2 + 1, 0, :, :]
vin = vdata[ntime1:ntime2 + 1, 0, :, :]
dates = num2date(times[ntime1:ntime2 + 1], times.units, calendar='standard')