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tec_maps.py
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tec_maps.py
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#!/usr/bin/env python
## =============================================================================
## =============================================================================
##
## tec_maps.py
##
## Created by J. E. Kooi 2014/04/25 v2.0
## Modified by gmoellen 2014/07/21 v2.1 (minor mods, mostly semantics)
## Modified by J. E. Kooi 2014/09/17 v2.2 (minor mods, formating and
## ~ Test for network connection
## ~ Heirarchy of IGS-related
## data products added
## ~ Added IGS RMS TEC maps
## ~ Made IGS default data product)
## Modified by gmoellen 2014/09/30 v2.3 (added simplified create method
## that hides all of the MAPGPS-related
## options, and thereby streamlines
## approved general usage for
## CASA 4.3)
## Modified by J. E. Kooi 2015/01/29 v2.4 (Changed get_IGS_TEC to accept
## IONEX format data with ANY grid
## spacing in deg. and time res in min)
## Modified by J. E. Kooi 2015/03/2 v2.5 (Changed ztec_value for doplot =
## True to plot a red bar over the VTEC
## to show the observing session)
## Modified by gmoellen 2017/05/30 v2.6 Generate plot disk file
## Modified by bkent 2017/10-31 v2.7 Fixed VisibleDeprecationWarning:
## using a non-integer
## number instead of an integer will
## result in an error in the future
## Modified by J. Radcliffe 2020/09/10 v2.8 Adjusted code to run on CASA 6
## 2020/12/17 v2.9 Added fixes due to ftp server changing
##
##
## Tested in CASA 6.1 on MacOSX 10.15
## Tested in CASA 4.3.0, 4.2.2, and 4.2.1 on Mac OS 10.8.5
##
##
##
## The purpose of this python module is to retrieve vertical TEC/DTEC maps from
## either IGS (housed on the CDDIS servers) or MAPGPS (housed on the Madrigal
## servers).
##
## **** Currently, the MAPGPS is "turned off" and modification of line 306 ****
## **** is required to turn this functionality back "on." ****
##
## The IGS Final Product maps represent a combined TEC map:
## The different IGS Ionosphere Associate Analysis Centers IAAC TEC maps have
## been computed with different approaches but with a common formal resolution
## of 2 hours, 5 degrees, and 2.5 degrees in UT, longitude, and latitude
## (details can be found in e.g. Schaer, 1999; Feltens, 1998;
## Mannucci et al., 1998; Gao et al.; Hernandez-Pajares et al.,1999). The four
## IAACs TEC maps have been combined in an IGS combination product using weights
## obtained by two IGS Ionosphere Associate Validation Centers (IAVCs) from the
## corresponding performances in reproducing STEC and differences of STEC (IAVCs
## NRCAN and UPC respectively, see details in Feltens, 2002).
## ------ Krankowski & Sieradzki, 2013 (references can be found in this paper)
##
## The code has a hierarchy for IGS data products. It will initially search for
## the IGS Final product data (available ~ 10-14 days after an observation) and,
## if unavailable, then the IGS Rapid Product (available in ~ 1-2 days) and,
## if unavailable, then the JPL Rapid Product.
##
## The MAPGPS maps are computed with no pre-applied ionosphere model and, in
## this sense, represent 'raw TEC data.' The benefit is that they have a formal
## resolution of 5 minutes, 1.0 degree, and 1.0 degree in UT, longitude, and
## latitude (details can be found in Rideout & Coster, 2006). The drawback is
## that the data is sparsely gridded in many locations (e.g., there are no GPS
## ground stations in the middle of the ocean) and there are sporadic gaps in
## the data at some locations (e.g., even over the United States).
##
## For now, users are encouraged to use the IGS Final Product maps instead of
## MAPGPS products because there is data at all grid points and times,
## making it easier to deal with in the code. The code for MAPGPS is also set
## to make a 'patch' over North America and therefore is not a global map.
## However, the code is included and need only be uncommented. Feel free to
## experiment and compare the IGS and MAPGPS maps!
##
## This module calls several methods depending on the TEC/DTEC server and
##
## (1) Produces a CASA image of the TEC data for
## a) The whole world (IGS) (additional DTEC data image is output)
## b) A 15 deg. patch centered on the VLA (MAPGPS)
## (2) Optionally produces a vertical TEC/DTEC time series for the VLA
##
## !!!!! Important Note: In order to access the MAPGPS data, you must:
## (1) Have "madrigalWeb.py" and "globalDownload.py" and
## "madrigal.head" in the working directory
## (2) Provide your name, e-mail, and institution in the .create0 method to
## access the Madrigal server
##
## References:
##
## Krankowski, A., & Sieradzki, R. 2013, in International GNSS Service
## Technical Report, ed. R. Dach & Y. Jean, IGS Central Bureau
## (Astronomical Institute:University of Bern), 157
## Rideout, W., & Coster, A. 2006, GPS Solutions, 10, 219
##
## =============================================================================
##
## Example Use:
##
## (0) The default use provides the IGS Product:
## > import tec_maps
## > msname = 'visibilities.ms'
## > CASA_image,CASA_RMS_image = tec_maps.create0(msname)
##
## (1) IGS Product (w/out the vertical TEC/DTEC time series at the VLA)
## > import tec_maps
## > msname = 'visibilities.ms'
## > CASA_image,CASA_RMS_image = tec_maps.create0(msname,'IGS')
## > viewer(CASA_image)
## > viewer(CASA_RMS_image)
##
## (2) IGS Product (WITH the vertical TEC/DTEC time series at the VLA)
## > import tec_maps
## > msname = 'visibilities.ms'
## > CASA_image,CASA_RMS_image = tec_maps.create0(msname,'IGS',True)
## > viewer(CASA_image)
## > viewer(CASA_RMS_image)
##
## (3) IGS Product (WITH the vertical TEC/DTEC time series at the VLA and for
## which the user specifies the output image name)
## > import tec_maps
## > msname = 'visibilities.ms'
## > imagename = 'my_image'
## > CASA_image,CASA_RMS_image = tec_maps.create0(msname,'IGS',True,imagename)
## > viewer(CASA_image)
## > viewer(CASA_RMS_image)
##
## (4) MAPGPS (WITH the vertical TEC/DTEC time series for the VLA)
## > import tec_maps
## > msname = 'visibilities.ms'
## > myname = 'John Doe'
## > myemail = 'john-doe@place.edu'
## > myplace = 'NRAO'
## > CASA_image,CASA_RMS_image =
## tec_maps.create0(msname,'MAPGPS',True,'',myname,myemail,myplace)
## > viewer(CASA_image)
## > viewer(CASA_RMS_image)
##
##
## =============================================================================
## =============================================================================
try:
# CASA 6
import casatools
from casatasks import *
casalog.showconsole(True)
import urllib.request as urllib2
casa6=True
except:
# CASA 5
from casac import casac as casatools
from taskinit import *
import urllib2
casa6=False
import glob, os, datetime
import numpy as np
from matplotlib import rc
import matplotlib.pyplot as plt
tb = casatools.table()
qa = casatools.quanta()
cs = casatools.coordsys()
ia = casatools.image()
workDir = '%s'%(os.getcwd()+'/')
def create(vis,doplot=False,imname=''):
"""
## =============================================================================
##
## This method opens the .ms to determine the days of observation and calls the
## necessary functions to acquire the desired set of TEC/DTEC data. The method
## finally calls ztec_value and make_image once it has the data.
##
## =============================================================================
##
## Inputs:
## vis type = string Name of the measurement set for which to
## acquire TEC/DTEC data
## doplot type = boolean When True, this will open a plot of the
## interpolated TEC/DTEC at the VLA.
## imname type = string Name of the output TEC Map optionally
## specified by the user
##
## Returns:
## Opens a plot showing the zenith TEC/DTEC for the VLA
## (if doplot = True) and the name of the CASA image file containing
## the TEC map.
##
## =============================================================================
Usage:
The default use provides the IGS Product:
> vis = 'visibilities.ms'
> CASA_image,CASA_RMS_image = tec_maps.create(vis)
IGS Product (WITH the vertical TEC/RMS TEC time series at the VLA)
> vis = 'visibilities.ms'
> CASA_image,CASA_RMS_image = tec_maps.create(msname,plot_vla_tec = True)
The TEC and RMS TEC images can then be examined using viewer:
> viewer(CASA_image)
> viewer(CASA_RMS_image)
The TEC image should then be used in gencal (caltype='tecim') to
generate a sampled caltable that will nominally correct for
ionospheric effects
"""
# call the more general method
return create0(ms_name=vis,plot_vla_tec=doplot,im_name=imname)
def create0(ms_name,tec_server='IGS',plot_vla_tec=False,im_name='',username='',password='',user_email='',affiliation='',force_to='final'):
"""
## =============================================================================
##
## This opens the .ms to determine the days of observation and calls the
## necessary functions to acquire the desired set of TEC/DTEC data. The method
## finally calls ztec_value and make_image once it has the data.
##
## =============================================================================
##
## Inputs:
## ms_name type = string Name of the measurement set for which to
## acquire TEC/DTEC data
## tec_server type = string Server from which to retrieve TEC/DTEC
## plot_vla_tec type = boolean When True, this will open a plot of the
## interpolated TEC/DTEC at the VLA.
## im_name type = string Name of the output TEC Map optionally
## specified by the user
## username type = string MAPGPS only: full name of user accessing
## the site
## ex: '<First> <Last>'
## user_email type = string MAPGPS only: e-mail address at which the
## user can be reached
## ex: '<name>@<place>.com'
## affiliation type = string MAPGPS only: user's affiliated institute
## ex: 'NRAO'
##
## Returns:
## Opens a plot showing the zenith TEC/DTEC for the VLA
## (if plot_vla_tec = True) and the name of the CASA image file containing
## the TEC map.
##
## =============================================================================
Usage:
The default use provides the IGS Product:
> msname = 'visibilities.ms'
> CASA_image,CASA_RMS_image = tec_maps.create(msname)
IGS Product (WITH the vertical TEC/RMS TEC time series at the VLA)
> msname = 'visibilities.ms'
> CASA_image,CASA_RMS_image = tec_maps.create(msname,plot_vla_tec = True)
The TEC and RMS TEC images can then be examined using viewer:
> viewer(CASA_image)
> viewer(CASA_RMS_image)
"""
## Open the .ms to get the range in observation times
tb.open(ms_name+'/OBSERVATION')
obs_times = tb.getcol('TIME_RANGE')
tb.close()
t_min = min(obs_times)
t_max = max(obs_times)
## Calculate the reference time for the TEC map to be generated.
ref_time = 86400.*np.floor(t_min[0]/86400)
ref_start = t_min[0]-ref_time
ref_end = t_max[0]-ref_time
## Gets the day string and the integer number of days of observation (only tested for two continuous days)
begin_day = qa.time(str(t_min[0])+'s',form='ymd')[0][:10]
end_day = qa.time(str(t_max[0])+'s',form='ymd')[0][:10]
num_of_days = int(np.floor((t_max[0]-t_min[0])/86400.)) # must be an int as used below!
## Set up the number of times we need to go get TEC files
if begin_day == end_day:
call_num = 1
elif num_of_days == 0:
call_num = 2
else:
call_num = num_of_days+1
## Set up the days for which we need to go get TEC files
day_list = []
next_day = begin_day
for iter in range(call_num):
day_list.append(next_day)
next_day = qa.time(str(t_min[0]+86400.*(iter+1))+'s',form='ymd')[0][:10]
## Runs the IGS methods
if tec_server == 'IGS':
ymd_date_num = 0
array = []
for ymd_date in day_list:
points_long,points_lat,ref_long,ref_lat,incr_long,incr_lat,incr_time,num_maps,tec_array,tec_type = get_IGS_TEC(ymd_date,username,password,force_to)
## Fill a new array with all the full set of TEC/DTEC values for all days in the observation set.
if tec_type != '':
if ymd_date_num == 0:
full_tec_array = np.zeros((2,int(points_long),int(points_lat),(int(num_maps)-1)*int(call_num)+1))
for iter in range(int(num_maps)):
full_tec_array[:,:,:,iter] = tec_array[:,:,:,iter]
else:
## We remove map 0 for the current tec_array because it is a repeat of the last map from the previous tec_array
for iter in range(int(num_maps-1)):
full_tec_array[:,:,:,iter+int(num_maps)*ymd_date_num] = tec_array[:,:,:,iter+1]
ymd_date_num +=1
if tec_type != '':
if im_name == '':
prefix = ms_name
else:
prefix = im_name
plot_name=''
if plot_vla_tec:
plot_name=prefix+'.IGS_TEC_at_site.png'
ztec_value(-107.6184,34.0790,points_long,points_lat,ref_long,ref_lat,incr_long,\
incr_lat,incr_time,ref_start,ref_end,int((num_maps-1)*call_num+1),\
full_tec_array,plot_vla_tec,plot_name)
CASA_image = make_image(prefix,ref_long,ref_lat,ref_time,incr_long,incr_lat,\
incr_time*60,full_tec_array[0],tec_type,appendix = '.IGS_TEC')
CASA_RMS_image = make_image(prefix,ref_long,ref_lat,ref_time,incr_long,incr_lat,\
incr_time*60,full_tec_array[1],tec_type,appendix = '.IGS_RMS_TEC')
else:
CASA_image = ''
CASA_RMS_image = ''
## Runs the Madrigal methods; requires "madrigalWeb.py" and "globalDownload.py" and "madrigal.head"
if tec_server == 'MAPGPS':
print('\nCurrently, MAPGPS has been set to "False" \nand you must change tec_maps.py at line 306\n')
CASA_image = ''
CASA_RMS_image = ''
if (tec_server == 'MAPGPS' and False): ## replace with: if tec_server == 'MAPGPS':
mad_file_front = 'gps'+str(begin_day.split('/')[0])[2:]+str(begin_day.split('/')[1])+str(begin_day.split('/')[2])
mad_data_file = ms_name[:-3]+'_MAPGPS_Data'
mad_file = ''
mad_file = check_existence(mad_data_file)
if username!='' and user_email!='' and affiliation!='':
if mad_file == '':
print('Retrieving the following MAPGPS files: '+begin_day+' to '+end_day)
begin_mdy = str(begin_day.split('/')[1])+'/'+str(begin_day.split('/')[2])+'/'+str(begin_day.split('/')[0])
end_mdy = str(end_day.split('/')[1])+'/'+str(end_day.split('/')[2])+'/'+str(end_day.split('/')[0])
os.system('python globalDownload.py --url=http://madrigal.haystack.mit.edu/madrigal --outputDir='+workDir+\
' --user_fullname="'+username+'" --user_email='+user_email+' --user_affiliation='+affiliation+\
' --format=ascii --startDate='+str(begin_mdy)+' --endDate='+str(end_mdy)+' --inst=8000')
non_day = qa.time(str(t_min[0]-86400.)+'s',form='ymd')[0][:10]
non_file_prefix = 'gps'+str(non_day.split('/')[0])[2:]+str(non_day.split('/')[1])+str(non_day.split('/')[2])
unwanted_file = check_existence(non_file_prefix)
os.system('rm -rf '+unwanted_file+'.txt')
files = glob.glob(r''+workDir+'*.txt')
outfile = open(workDir+mad_data_file+'.txt','a')
for y in files:
newfile = open(y,'r+')
data = newfile.read()
newfile.close()
outfile.write(data)
outfile.close()
## Making the CASA table is expensive, so we do it only once.
print('Making a CASA table of: ', mad_data_file)
make_CASA_table(mad_data_file)
try:
CASA_image = convert_MAPGPS_TEC(ms_name,mad_data_file,ref_time,ref_start,\
ref_end,plot_vla_tec,im_name)
except:
print('An error was encountered retrieving/interpreting the MAPGPS files.')
CASA_image = ''
CASA_RMS_image = ''
else:
print('You need to supply your username, e-mail, and affiliation to access the Madrigal server.')
CASA_image = ''
CASA_RMS_image = ''
## Returns the name of the TEC image generated
print('The following TEC map was generated: '+CASA_image+' & '+CASA_RMS_image)
if len(plot_name)>0:
print('The following TEC zenith plot was generated: '+plot_name)
else:
plot_name='none'
return CASA_image,CASA_RMS_image,plot_name
def get_IGS_TEC(ymd_date,username,password,force_to):
"""
## =============================================================================
##
## Retrieves the IGS data and, specifically, the IGS Final Product: this is
## the combined TEC map from the four IAACs TEC maps.
##
## =============================================================================
##
## Inputs:
## ymd_date type = string The 'yyyy/mm/dd' date of observation for
## which this will retrieve data
##
## Returns:
## points_long type = integer Total number of points in longitude (deg)
## in the TEC map
## points_lat type = integer Total number of points in latitude (deg)
## in the TEC map
## start_long type = float Initial value for the longitude (deg)
## end_lat type = float Final value for the latitude (deg)
## incr_long type = float Increment by which longitude increases
## IGS data: 5 deg
## MAPGPS data: 1 deg
## incr_lat type = float Absolute value of the increment by which
## latitude increases
## IGS data: 2.5 deg
## MAPGPS data: 1 deg
## incr_time type = float Increment by which time increases
## IGS data: 120 min
## MAPGPS data: 5 min
## num_maps type = integer Number of maps (or time samples) of TEC
## tec_array type = array 4D array with axes consisting of
## [TEC_type,long.,lat.,time] that gives
## the TEC/DTEC in TECU
## tec_type type = string Specifies the origin of TEC data as a
## CASA table keyword
##
## =============================================================================
"""
year = int(ymd_date.split('/')[0])
month = int(ymd_date.split('/')[1])
day = int(ymd_date.split('/')[2])
## Gives the day of the year of any given year
dayofyear = datetime.datetime.strptime(''+str(year)+' '+str(month)+' '+str(day)+'', '%Y %m %d').timetuple().tm_yday
## Prepare the 3-digit day of the year for use to find the right IONEX file
if dayofyear < 10:
dayofyear = '00'+str(dayofyear)
if dayofyear < 100 and dayofyear >= 10:
dayofyear = '0'+str(dayofyear)
## Outputing the name of the IONEX file you require.
if force_to == 'final':
pf = 'igsg'
elif force_to == 'rapid':
pf = 'igrg'
elif force_to == 'jpl':
pf = 'jprg'
else:
sys.exit()
igs_file = pf+str(dayofyear)+'0.'+str(list(str(year))[2])+''+str(list(str(year))[3])+'i'
## =========================================================================
##
## This goes to the CDDIS website, and downloads and uncompresses the IGS
## file. The preference is for the IGS Final product (IGSG), available
## ~ 12-14 days after data is collected (i.e. data for September 1 should
## be available by September 14). If this file is not already in the
## current working directory, it will retrieve it. If the file is
## unavailable, it will try to retrieve the IGS Rapid Product (IGRG),
## released ~ 2-3 days after data is collected. If this file is
## unavailable, it will try to retrieve the JPL Rapid Product (JPRG),
## released ~ 1 day after data is collected. While the 'uncompress' command
## is not necessary, it is the most straightforward on Linux.
##
## =========================================================================
does_exist = ''
does_exist = check_existence(igs_file)
if does_exist == '':
print('Retrieving the following file: ', igs_file)
CDDIS = 'ftp://gdc.cddis.eosdis.nasa.gov/gnss/products/ionex'
file_location = CDDIS+'/'+str(year)+'/'+str(dayofyear)+'/'
workDir2 = workDir.replace(' ','\\ ')
if does_exist == '':
get_file = file_location+igs_file+'.Z'
retrieve = True
if retrieve == True:
print('curl -u %s:%s -O --ftp-ssl %s' % (username,password,get_file))
os.system('curl -u %s:%s -O --ftp-ssl %s' % (username,password,get_file))
os.system('cp %s %s%s.Z'%(get_file,workDir2,igs_file))
os.system('uncompress '+igs_file+'.Z')
does_exist = check_existence(igs_file)
else:
print(igs_file, 'is unavailable')
igs_file = igs_file.replace('igs','igr')
does_exist = check_existence(igs_file)
if does_exist == '':
print('Retrieving the following file instead: ', igs_file)
get_file = file_location+igs_file+'.Z'
retrieve = test_connection(get_file)
if retrieve == True:
os.system('curl -J '+get_file+' > '+workDir2+igs_file+'.Z')
os.system('uncompress '+igs_file+'.Z')
else:
print(igs_file, 'is unavailable')
igs_file = igs_file.replace('igr','jpr')
does_exist = check_existence(igs_file)
if does_exist == '':
print('Retrieving the following file instead: ', igs_file)
get_file = file_location+igs_file+'.Z'
retrieve = test_connection(get_file)
if retrieve == True:
os.system('curl -J '+get_file+' > '+workDir2+igs_file+'.Z')
os.system('uncompress '+igs_file+'.Z')
else:
print(igs_file, 'is unavailable')
print('\nNo data products available. You may try to manually'\
' download the products at:\n'\
'ftp://cddis.gsfc.nasa.gov/gnss/products/ionex\n')
return 0,0,0,0,0,0,0,0,[0],''
else:
pass
else:
pass
else:
pass
if igs_file.startswith('igs'):
tec_type = 'IGS_Final_Product'
elif igs_file.startswith('igr'):
tec_type = 'IGS_Rapid_Product'
elif igs_file.startswith('jpr'):
tec_type = 'JPL_Rapid_Product'
## =========================================================================
##
## The following section reads the lines of the ionex file for 1 day
## (13 maps total) into an array a[]. It also retrieves the thin-shell
## ionosphere height used by IGS, the lat./long. spacing, etc. for use
## later in this script.
##
## =========================================================================
print('Transfering IONEX data format to a TEC/DTEC array for ',ymd_date)
## Opening and reading the IONEX file into memory as a list
linestring = open(igs_file, 'r').read()
LongList = linestring.split('\n')
## Create two lists without the header and only with the TEC and DTEC maps (based on code from ionFR.py)
AddToList = 0
TECLongList = []
DTECLongList = []
for i in range(len(LongList)-1):
## Once LongList[i] gets to the DTEC maps, append DTECLongList
if LongList[i].split()[-1] == 'MAP':
if LongList[i].split()[-2] == 'RMS':
AddToList = 2
if AddToList == 1:
TECLongList.append(LongList[i])
if AddToList == 2:
DTECLongList.append(LongList[i])
## Determine the number of TEC/DTEC maps
if LongList[i].split()[-1] == 'FILE':
if LongList[i].split()[-3:-1] == ['MAPS','IN']:
num_maps = float(LongList[i].split()[0])
## Determine the shell ionosphere height (usually 450 km for IGS IONEX files)
if LongList[i].split()[-1] == 'DHGT':
ion_H = float(LongList[i].split()[0])
## Determine the range in lat. and long. in the ionex file
if LongList[i].split()[-1] == 'DLAT':
start_lat = float(LongList[i].split()[0])
end_lat = float(LongList[i].split()[1])
incr_lat = float(LongList[i].split()[2])
if LongList[i].split()[-1] == 'DLON':
start_long = float(LongList[i].split()[0])
end_long = float(LongList[i].split()[1])
incr_long = float(LongList[i].split()[2])
## Find the end of the header so TECLongList can be appended
if LongList[i].split()[0] == 'END':
if LongList[i].split()[2] == 'HEADER':
AddToList = 1
## Variables that indicate the number of points in Lat. and Lon.
points_long = ((end_long - start_long)/incr_long) + 1
points_lat = ((end_lat - start_lat)/incr_lat) + 1 ## Note that incr_lat is defined as '-' here
number_of_rows = int(np.ceil(points_long/16)) ## Note there are 16 columns of data in IONEX format
## 4-D array that will contain TEC & DTEC (a[0] and a[1], respectively) values
a = np.zeros((2,int(points_long),int(points_lat),int(num_maps)))
## Selecting only the TEC/DTEC values to store in the 4-D array.
for Titer in range(2):
counterMaps = 1
UseList = []
if Titer == 0:
UseList = TECLongList
elif Titer == 1:
UseList = DTECLongList
for i in range(len(UseList)):
## Pointing to first map (out of 13 maps) then by changing 'counterMaps' the other maps are selected
if UseList[i].split()[0] == ''+str(counterMaps)+'':
if UseList[i].split()[-4] == 'START':
## Pointing to the starting Latitude then by changing 'counterLat' we select TEC data
## at other latitudes within the selected map
counterLat = 0
newstartLat = float(str(start_lat))
for iLat in range(int(points_lat)):
if UseList[i+2+counterLat].split()[0].split('-')[0] == ''+str(newstartLat)+'':
## Adding to array a[] a line of Latitude TEC data
counterLon = 0
for row_iter in range(number_of_rows):
for item in range(len(UseList[i+3+row_iter+counterLat].split())):
a[Titer,counterLon,iLat,counterMaps-1] = UseList[i+3+row_iter+counterLat].split()[item]
counterLon = counterLon + 1
if '-'+UseList[i+2+counterLat].split()[0].split('-')[1] == ''+str(newstartLat)+'':
## Adding to array a[] a line of Latitude TEC data. Same chunk as above but
## in this case we account for the TEC values at negative latitudes
counterLon = 0
for row_iter in range(number_of_rows):
for item in range(len(UseList[i+3+row_iter+counterLat].split())):
a[Titer,counterLon,iLat,counterMaps-1] = UseList[i+3+row_iter+counterLat].split()[item]
counterLon = counterLon + 1
counterLat = counterLat + row_iter + 2
newstartLat = newstartLat + incr_lat
counterMaps = counterMaps + 1
## =========================================================================
##
## The section creates a new array that is a copy of a[], but with the lower
## left-hand corner defined as the initial element (whereas a[] has the
## upper left-hand corner defined as the initial element). This also
## accounts for the fact that IONEX data is in 0.1*TECU.
##
## =========================================================================
## The native sampling of the IGS maps minutes
incr_time = 24*60/(int(num_maps)-1)
tec_array = np.zeros((2,int(points_long),int(points_lat),int(num_maps)))
for Titer in range(2):
incr = 0
for ilat in range(int(points_lat)):
tec_array[Titer,:,ilat,:] = 0.1*a[Titer,:,int(points_lat)-1-ilat,:]
return points_long,points_lat,start_long,end_lat,incr_long,np.absolute(incr_lat),incr_time,num_maps,tec_array,tec_type
def check_existence(file_prefix):
"""
## =============================================================================
##
## Checks to see if the IGS or MAPGPS file for a given day already exists and
## returns the file name prefix. Primarily used to ensure we only call the data
## and make the CASA table once.
##
## =============================================================================
##
## Inputs:
## file_prefix type = string This is the prefix for the file name to
## search for in the current directorty
## IGS form: 'igsg'+'ddd'+'0.'+'yy'+'i'
## ex: August 6, 2011 is 'igsg2180.11i'
## MAPGPS form: 'gps'+'yy'+'mm'+'dd'
## ex: August 6, 2011 is 'gps110806'
##
## Returns:
## The name of the file it located.
##
## =============================================================================
"""
file_name = ''
return_file = ''
for file_name in [doc for doc in os.listdir(workDir)]:
if (file_prefix.startswith('igs') and file_name.startswith('igs')):
if file_name.startswith(file_prefix):
return_file = file_prefix
if (file_prefix.startswith('igr') and file_name.startswith('igr')):
if file_name.startswith(file_prefix):
return_file = file_prefix
if (file_prefix.startswith('jpr') and file_name.startswith('jpr')):
if file_name.startswith(file_prefix):
return_file = file_prefix
if (file_prefix.startswith('gps') and file_name.startswith('gps')):
if (file_name.startswith(file_prefix) and file_name.endswith('.txt')):
return_file = file_name[:-4]
if (file_prefix.endswith('_MAPGPS_Data') and file_name.endswith('_MAPGPS_Data.tab')):
if (file_name.startswith(file_prefix) and file_name.endswith('.tab')):
return_file = file_prefix
return return_file
def make_image(prefix,ref_long,ref_lat,ref_time,incr_long,incr_lat,incr_time,tec_array,tec_type,appendix=''):
"""
## =============================================================================
##
## Creates a new image file with the TEC data and then returns the image name.
## This also sets up the reference frame for use at the C++ level.
##
## =============================================================================
##
## Inputs:
## prefix type = string Full file name for use in naming the image
## IGS form: 'igsg'+'ddd'+'0.'+'yy'+'i'
## ex: August 6, 2011 is 'igsg2180.11i'
## MAPGPS form: 'gps'+'yy'+'mm'+'dd'+'.###'
## ex: August 17, 2011 is 'gps110817g.001'
## ref_long type = float Reference long. (deg) for setting coordinates
## ref_lat type = float Reference lat. (deg) for setting coordinates
## ref_time type = float Reference time (s) for setting coordinates,
## UT 0 on the first day
## incr_long type = float Increment by which longitude increases
## IGS data: 5 deg
## MAPGPS data: 1 deg
## incr_lat type = float Increment by which latitude increases
## IGS data: 2.5 deg
## MAPGPS data: 1 deg
## incr_time type = float Increment by which time increases
## IGS data: 120 min
## MAPGPS data: 5 min
## tec_array type = array 3D array with axes consisting of
## [long.,lat.,time] giving the TEC in TECU
## tec_type type = string Specifies the origin of TEC data as a
## CASA table keyword
## appendix type = string Appendix to add to the end of the image name
##
## Returns:
## The name of the TEC map image
##
## =============================================================================
"""
print('Trying to make an image of', prefix+appendix+'.im')
## Set the coordinate system for the TEC image
cs0=cs.newcoordsys(linear=3)
cs0.setnames(value='Long Lat Time')
cs0.setunits(type='linear',value='deg deg s',overwrite=True)
cs0.setreferencevalue([ref_long,ref_lat,ref_time])
cs0.setincrement(type='linear',value=[incr_long,incr_lat,incr_time])
## Make and view the TEC image
imname=prefix+appendix+'.im'
ia.fromarray(outfile=imname,pixels=tec_array,csys=cs0.torecord(),overwrite=True)
ia.summary()
## ia.statistics()
ia.close()
## Specify in the image where the TEC data came from
tb.open(imname,nomodify=False)
tb.putkeyword('TYPE',tec_type)
tb.close()
return imname
def ztec_value(my_long,my_lat,points_long,points_lat,ref_long,ref_lat,incr_long,incr_lat,incr_time,ref_start,ref_end,num_maps,tec_array,PLOT=False,PLOTNAME=''):
"""
## =============================================================================
##
## Determine the TEC value for the coordinates given at every time sampling of
## the TEC. This locates the 4 points in the IONEX grid map which surround the
## coordinate for which you want to calculate the TEC value.
##
## =============================================================================
##
## Inputs:
## my_long type = float Long. (deg) at which this interpolates TEC
## my_lat type = float Lat. (deg) at which this interpolates TEC
## points_long type = integer Total number of points in long. (deg)
## in the TEC map
## points_lat type = integer Total number of points in lat. (deg)
## in the TEC map
## ref_long type = float Initial value for the longitude (deg)
## ref_lat type = float Initial value for the latitude (deg)
## incr_long type = float Increment by which longitude increases
## IGS data: 5 deg
## MAPGPS data: 1 deg
## incr_lat type = float Increment by which latitude increases
## IGS data: 2.5 deg
## MAPGPS data: 1 deg
## incr_time type = float Increment by which time increases
## IGS data: 120 min
## MAPGPS data: 5 min
## ref_start type = float Beginning of observations (in seconds)
## ref_end type = float End of observations (in seconds)
## num_maps type = integer Number of maps (or time samples) of TEC
## tec_array type = array 3D array with axes consisting of
## [long.,lat.,time] giving TEC in TECU
## PLOT type = boolean Determines whether to plot or return the
## TEC time series of the local long./lat.
##
## Returns:
## site_tec type = array 2D array containing the TEC/DTEC values
## for the local long./lat.
##
## =============================================================================
"""
indexLat = 0
indexLon = 0
n = 0
m = 0
## Find the corners of the grid that surrounds the local long./lat.
for lon in range(int(points_long)):
if (my_long > (ref_long + (n+1)*incr_long) and my_long <= (ref_long + (n+2)*incr_long)) :
lowerIndexLon = n + 1
higherIndexLon = n + 2
n = n + 1
for lat in range(int(points_lat)):
if (my_lat > (ref_lat + (m+1)*incr_lat) and my_lat <= (ref_lat + (m+2)*incr_lat)) :
lowerIndexLat = m + 1
higherIndexLat = m + 2
m = m + 1
## Using the 4-point formula indicated in the IONEX manual, find the TEC value at the local coordinates
diffLon = my_long - (ref_long + lowerIndexLon*incr_long)
WLON = diffLon/incr_long
diffLat = my_lat - (ref_lat + lowerIndexLat*incr_lat)
WLAT = diffLat/incr_lat
site_tec = np.zeros((2,num_maps))
for Titer in range(2):
for m in range(num_maps):
site_tec[Titer,m] = (1.0-WLAT)*(1.0-WLON)*tec_array[Titer,lowerIndexLon,lowerIndexLat,m] +\
WLON*(1.0-WLAT)*tec_array[Titer,higherIndexLon,lowerIndexLat,m] +\
(1.0-WLON)*WLAT*tec_array[Titer,lowerIndexLon,higherIndexLat,m] +\
WLON*WLAT*tec_array[Titer,higherIndexLon,higherIndexLat,m]
if PLOT == True:
## Set axis label size for the plots
rc('xtick', labelsize=15)
rc('ytick', labelsize=15)
plottimes = [x*incr_time for x in range(num_maps)]
plt.interactive(False)
plt.errorbar(plottimes,site_tec[0],site_tec[1])
plt.axvspan(ref_start/60.0, ref_end/60.0, facecolor='r', alpha=0.5)
plt.xlabel(r'$\mathrm{Time}$ $\mathrm{(minutes)}$', fontsize=20)
plt.ylabel(r'$\mathrm{TEC}$ $\mathrm{(TECU)}$', fontsize=20)
plt.title(r'$\mathrm{TEC}$ $\mathrm{values}$ $\mathrm{for}$ $\mathrm{Long.}$ $\mathrm{=}$ '+\
'$\mathrm{'+str(my_long)+'}$ / $\mathrm{Lat.}$ $\mathrm{=}$ $\mathrm{'+str(my_lat)+'}$',\
fontsize=20)
plt.axis([min(plottimes),max(plottimes),0,1.1*max(site_tec[0])])
if len(PLOTNAME)>0:
plt.savefig( PLOTNAME )
if PLOT == False:
return site_tec
def test_connection(reference):
"""
## =============================================================================
##
## Determines whether the machine is connected to the internet or not. Also
## used to determine whether a given IONEX file exists.
##
## =============================================================================
##
## Inputs:
## reference type = string website/online file to attempt to access
##
## Returns:
## True if the website/online file is accessible and False if not
##
## =============================================================================
"""
try:
response = urllib2.urlopen(reference,timeout=5)
return True
except urllib2.URLError as err:
return False
def convert_MAPGPS_TEC(ms_name,mad_data_file,ref_time,ref_start,ref_end,plot_vla_tec,im_name):
"""
## =============================================================================
##
## This opens the MAPGPS Data table and selects a subset of TEC/DTEC values
## within a 15 deg square of the VLA. This then plots the zenith TEC/DTEC at the
## VLA site and makes the TEC map for use at the C++ level. We chose to deal
## with the MAPGPS data in this separate fashion because there are large
## 'gaps' in the data where no TEC/DTEC values exist. Consequently, we use the
## filled in CASA table to produce a TEC map and can not simply
## concatenate arrays.
##
## =============================================================================
##
## Inputs:
## ms_name type = string Name of the measurement set for which to
## acquire TEC/DTEC data
## mad_data_file type = string Name of the MAPGPS TEC/DTEC data table
## ref_time type = float Reference time (s) for setting the
## coordinates, UT 0 on the first day
## plot_vla_tec type = boolean When True, this will open a plot of the
## interpolated TEC/DTEC at the VLA.
## im_name type = string Name of the output TEC Map optionally
## specified by the user
##
## Returns:
## Opens a plot showing the zenith TEC/DTEC at the VLA (if plot_vla_tec=True)
## and the name of the CASA image file containing the TEC map.
##
## =============================================================================
"""
## Only retrieve data in a 15x15 deg. patch centered (more or less) at the VLA
tb.open(mad_data_file+'.tab')
st0=tb.query('GDLAT>19 && GDLAT<49 && GLON>-122 && GLON<-92',
## If you want ALL the data to make a global map, use the line below:
#st0=tb.query('GDLAT>-90. && GDLAT<90. && GLON>-180. && GLON<180',
name='tecwindow')
utimes=np.unique(st0.getcol('UT1_UNIX'))
ulat=np.unique(st0.getcol('GDLAT'))
ulong=np.unique(st0.getcol('GLON'))
points_lat=len(ulat)
points_long=len(ulong)
num_maps=len(utimes)
## Initialize the array which will be used to make the image
tec_array=np.zeros((2,points_long,points_lat,num_maps),dtype=float)
minlat=min(ulat)
minlong=min(ulong)
print('rows',len(utimes))
itime=0
for t in utimes:
st1=st0.query('UT1_UNIX=='+str(t),name='bytime')
n=st1.nrows()
if itime%100==0:
print(itime, n)
ilong=st1.getcol('GLON')-minlong
ilat=st1.getcol('GDLAT')-minlat
itec=st1.getcol('TEC')
idtec=st1.getcol('DTEC')
for i in range(n):
tec_array[0,int(ilong[i]),int(ilat[i]),itime]=itec[i]
tec_array[1,int(ilong[i]),int(ilat[i]),itime]=idtec[i]
st1.close()
## Simply interpolate to cull as many zeros as possible
## (median of good neighbors, if at least four of them)
thistec_array=tec_array[:,:,:,itime].copy()
thisgood=thistec_array[0]>0.0
for i in range(1,points_long-1):
for j in range(1,points_lat-1):
if not thisgood[i,j]:
mask=thisgood[(i-1):(i+2),(j-1):(j+2)]
if np.sum(mask)>4:
#print itime, i,j, pylab.sum(mask)
tec_array[0,i,j,itime]=np.median(thistec_array[0,(i-1):(i+2),(j-1):(j+2)][mask])
tec_array[1,i,j,itime]=np.median(thistec_array[1,(i-1):(i+2),(j-1):(j+2)][mask])
itime+=1
st0.close()
tb.close()
ztec_value(-107.6184,34.0790,points_long,points_lat,minlong,minlat,1,\
1,5,ref_start,ref_end,int(num_maps),tec_array,plot_vla_tec)
## ref_time + 150 accounts for the fact that the MAPGPS map starts at 00:02:30 UT, not 00:00:00 UT
if im_name == '':
prefix = ms_name
else:
prefix = im_name
CASA_image = make_image(prefix,minlong,minlat,ref_time+150.0,1,1,5*60,tec_array[0],'MAPGPS',appendix = '.MAPGPS_TEC')
return CASA_image
def make_CASA_table(file_name):
"""
## =============================================================================
##
## Makes a CASA table for the MAPGPS file for a given day.
## It requires the 'madrigal.head' file be in the working directory.